Installing a cluster in an LPAR on IBM Z and IBM LinuxONE in a disconnected environment

In OpenShift Container Platform version 4.22, you can install a cluster directly in a logical partition (LPAR) on IBM Z(R) or IBM(R) LinuxONE infrastructure that you provision in a disconnected environment, without using a hypervisor layer.

note

While this document refers to only IBM Z(R), all information in it also applies to IBM(R) LinuxONE.

Prerequisites for installing a cluster on IBM Z in a disconnected environment

Before you install OpenShift Container Platform on IBM Z(R) using user-provisioned infrastructure in a disconnected environment, you must complete prerequisite tasks that prepare your mirrored registry, storage, and network environment.

You have completed the tasks in preparing to install a cluster on IBM Z(R) using user-provisioned infrastructure.
You reviewed details about the OpenShift Container Platform installation and update processes.
You read the documentation on selecting a cluster installation method and preparing it for users.
You mirrored the images for a disconnected installation to your registry and obtained the imageContentSources data for your version of OpenShift Container Platform.
Before you begin the installation process, you must move or remove any existing installation files. This ensures that the required installation files are created and updated during the installation process.

warning
Ensure that installation steps are done from a machine with access to the installation media.
You provisioned persistent storage by using OpenShift Data Foundation or other supported storage protocols for your cluster. To deploy a private image registry, you must set up persistent storage with ReadWriteMany access.
If you use a firewall and plan to use the Telemetry service, you configured the firewall to allow the sites that your cluster requires access to.

note
Be sure to also review this site list if you are configuring a proxy.

Additional resources

About installations in restricted networks

You can install OpenShift Container Platform 4.22 in a restricted network without an active internet connection to obtain software components. Restricted network installations can use installer-provisioned or user-provisioned infrastructure, depending on the cloud platform to which you are installing the cluster.

If you choose to perform a restricted network installation on a cloud platform, you still require access to its cloud APIs. Some cloud functions, such as Amazon Web Service’s Route 53 DNS and IAM services, require internet access. Depending on your network, you might require less internet access for an installation on bare-metal hardware, Nutanix, or on VMware vSphere.

To complete a restricted network installation, you must create a registry that mirrors the contents of the OpenShift image registry and contains the installation media. You can create this registry on a mirror host, which can access both the internet and your closed network, or by using other methods that meet your restrictions.

warning

Because of the complexity of the configuration for user-provisioned installations, consider completing a standard user-provisioned infrastructure installation before you try a restricted network installation using user-provisioned infrastructure. Completing this test installation might make it easier to isolate and troubleshoot any issues that might arise during your installation in a restricted network.

Additional limits

Clusters in restricted networks have the following additional limitations and restrictions:

The ClusterVersion status includes an Unable to retrieve available updates error.
By default, you cannot use the contents of the Developer Catalog because you cannot access the required image stream tags.

Preparing the user-provisioned infrastructure

Before you install OpenShift Container Platform on user-provisioned infrastructure, you must prepare the underlying infrastructure.

This section provides details about the high-level steps required to set up your cluster infrastructure in preparation for an OpenShift Container Platform installation. This includes configuring IP networking and network connectivity for your cluster nodes, preparing a web server for the Ignition files, enabling the required ports through your firewall, and setting up the required DNS and load balancing infrastructure.

After preparation, your cluster infrastructure must meet the requirements outlined in the Requirements for a cluster with user-provisioned infrastructure section.

Prerequisites

You have reviewed the OpenShift Container Platform 4.x Tested Integrations page.
You have reviewed the infrastructure requirements detailed in the Requirements for a cluster with user-provisioned infrastructure section.

Procedure

Set up static IP addresses.
Set up an HTTP or HTTPS server to provide Ignition files to the cluster nodes.
Ensure that your network infrastructure provides the required network connectivity between the cluster components. See the Networking requirements for user-provisioned infrastructure section for details about the requirements.
Configure your firewall to enable the ports required for the OpenShift Container Platform cluster components to communicate. See Networking requirements for user-provisioned infrastructure section for details about the ports that are required.

warning
By default, port 1936 is accessible for an OpenShift Container Platform cluster, because each control plane node needs access to this port.
For ingress health check probes, the /healthz/ready endpoint is available on this port.
Avoid using the Ingress load balancer to expose this port, because doing so might result in the exposure of sensitive information, such as statistics and metrics, related to Ingress Controllers.
Setup the required DNS infrastructure for your cluster.
1. Configure DNS name resolution for the Kubernetes API, the application wildcard, the bootstrap machine, the control plane machines, and the compute machines.
2. Configure reverse DNS resolution for the Kubernetes API, the bootstrap machine, the control plane machines, and the compute machines. See the User-provisioned DNS requirements section for more information about the OpenShift Container Platform DNS requirements.
Validate your DNS configuration.
1. From your installation node, run DNS lookups against the record names of the Kubernetes API, the wildcard routes, and the cluster nodes. Validate that the IP addresses in the responses correspond to the correct components.
2. From your installation node, run reverse DNS lookups against the IP addresses of the load balancer and the cluster nodes. Validate that the record names in the responses correspond to the correct components. See the Validating DNS resolution for user-provisioned infrastructure section for detailed DNS validation steps.
Provision the required API and application ingress load balancing infrastructure. See the Load balancing requirements for user-provisioned infrastructure section for more information about the requirements.

note
Some load balancing solutions require the DNS name resolution for the cluster nodes to be in place before the load balancing is initialized.

Example load balancer configuration for user-provisioned clusters

Reference the example API and application Ingress load balancer configuration so that you can understand how to meet the load balancing requirements for user-provisioned clusters.

The sample is an /etc/haproxy/haproxy.cfg configuration for an HAProxy load balancer. The example is not meant to provide advice for choosing one load balancing solution over another.

tip

If you are using HAProxy as a load balancer, you can check that the haproxy process is listening on ports 6443, 22623, 443, and 80 by running netstat -nltupe on the HAProxy node.

In the example, the same load balancer is used for the Kubernetes API and application ingress traffic. In production scenarios, you can deploy the API and application ingress load balancers separately so that you can scale the load balancer infrastructure for each in isolation.

note

If you are using HAProxy as a load balancer and SELinux is set to enforcing, you must ensure that the HAProxy service can bind to the configured TCP port by running setsebool -P haproxy_connect_any=1.

Sample API and application Ingress load balancer configuration
global
  log         127.0.0.1 local2
  pidfile     /var/run/haproxy.pid
  maxconn     4000
  daemon
defaults
  mode                    http
  log                     global
  option                  dontlognull
  option http-server-close
  option                  redispatch
  retries                 3
  timeout http-request    10s
  timeout queue           1m
  timeout connect         10s
  timeout client          1m
  timeout server          1m
  timeout http-keep-alive 10s
  timeout check           10s
  maxconn                 3000
listen api-server-6443
  bind *:6443
  mode tcp
  option  httpchk GET /readyz HTTP/1.0
  option  log-health-checks
  balance roundrobin
  server bootstrap bootstrap.ocp4.example.com:6443 verify none check check-ssl inter 10s fall 2 rise 3 backup
  server master0 master0.ocp4.example.com:6443 weight 1 verify none check check-ssl inter 10s fall 2 rise 3
  server master1 master1.ocp4.example.com:6443 weight 1 verify none check check-ssl inter 10s fall 2 rise 3
  server master2 master2.ocp4.example.com:6443 weight 1 verify none check check-ssl inter 10s fall 2 rise 3
listen machine-config-server-22623
  bind *:22623
  mode tcp
  server bootstrap bootstrap.ocp4.example.com:22623 check inter 1s backup
  server master0 master0.ocp4.example.com:22623 check inter 1s
  server master1 master1.ocp4.example.com:22623 check inter 1s
  server master2 master2.ocp4.example.com:22623 check inter 1s
listen ingress-router-443
  bind *:443
  mode tcp
  balance source
  server compute0 compute0.ocp4.example.com:443 check inter 1s
  server compute1 compute1.ocp4.example.com:443 check inter 1s
listen ingress-router-80
  bind *:80
  mode tcp
  balance source
  server compute0 compute0.ocp4.example.com:80 check inter 1s
  server compute1 compute1.ocp4.example.com:80 check inter 1s

where:

listen api-server-6443: Port 6443 handles the Kubernetes API traffic and points to the control plane machines. You must configure health checks on this port to ensure that the API server is available before routing traffic.
server bootstrap bootstrap.ocp4.example.com: The bootstrap entries must be in place before the OpenShift Container Platform cluster installation and they must be removed after the bootstrap process is complete.
listen machine-config-server: Port 22623 handles the machine config server traffic and points to the control plane machines.
listen ingress-router-443: Port 443 handles the HTTPS traffic and points to the machines that run the Ingress Controller pods. The Ingress Controller pods run on the compute machines by default.
listen ingress-router-80: Port 80 handles the HTTP traffic and points to the machines that run the Ingress Controller pods. The Ingress Controller pods run on the compute machines by default.
note
If you are deploying a compact three-node cluster with zero compute nodes, the Ingress Controller pods run on the control plane nodes. In three-node cluster deployments, you must configure your application Ingress load balancer to route HTTP and HTTPS traffic to the control plane nodes.

Manually creating the installation configuration file

Installing the cluster requires that you manually create the installation configuration file.

Prerequisites

You have an SSH public key on your local machine for use with the installation program. You can use the key for SSH authentication onto your cluster nodes for debugging and disaster recovery.
You have obtained the OpenShift Container Platform installation program and the pull secret for your cluster.

Procedure

Create an installation directory to store your required installation assets in:
```
$ mkdir <installation_directory>
```
warning
You must create a directory. Some installation assets, such as bootstrap X.509 certificates have short expiration intervals, so you must not reuse an installation directory. If you want to reuse individual files from another cluster installation, you can copy them into your directory. However, the file names for the installation assets might change between releases. Use caution when copying installation files from an earlier OpenShift Container Platform version.
Customize the provided sample install-config.yaml file template and save the file in the <installation_directory>.

note
You must name this configuration file install-config.yaml.
Back up the install-config.yaml file so that you can use it to install many clusters.

warning
Back up the install-config.yaml file now, because the installation process consumes the file in the next step.

Additional resources

Installation configuration parameters for IBM Z(R)

Sample install-config.yaml file for IBM Z

You can customize the install-config.yaml file to specify more details about your OpenShift Container Platform cluster platform or modify the values of the required parameters.

apiVersion: v1
baseDomain: example.com
compute:
- hyperthreading: Enabled
  name: worker
  replicas: 0
  architecture: s390x
controlPlane:
  hyperthreading: Enabled
  name: master
  replicas: 3
  architecture: s390x
metadata:
  name: test
networking:
  clusterNetwork:
  - cidr: 10.128.0.0/14
    hostPrefix: 23
  networkType: OVNKubernetes
  machineNetwork:
  - cidr: 192.168.0.0/16
  serviceNetwork:
  - 172.30.0.0/16
platform:
  none: {}
fips: false

pullSecret: '{"auths":{"<local_registry>": {"auth": "<credentials>","email": "you@example.com"}}}'

sshKey: 'ssh-ed25519 AAAA...'

additionalTrustBundle: |
  -----BEGIN CERTIFICATE-----
  ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ
  -----END CERTIFICATE-----
imageContentSources:
- mirrors:
  - <local_repository>/ocp4/openshift4
  source: quay.io/openshift-release-dev/ocp-release
- mirrors:
  - <local_repository>/ocp4/openshift4
  source: quay.io/openshift-release-dev/ocp-v4.0-art-dev

where:

baseDomain: Specifies the base domain of the cluster. All DNS records must be sub-domains of this base and include the cluster name.
compute: Specifies the compute node configurations, which is a sequence of mappings. To meet the requirements of the different data structures, the first line of the compute section must begin with a hyphen, -.
controlPlane: Specifies the controlPlane node configurations, which is a single mapping. To meet the requirements of the different data structures, the first line of the controlPlane section must not. Only one control plane pool is used.
hyperthreading: Specifies whether to enable or disable simultaneous multithreading (SMT), or hyperthreading. By default, SMT is enabled to increase the performance of the cores in your machines. You can disable it by setting the parameter value to Disabled. If you disable SMT, you must disable it in all cluster machines; this includes both control plane and compute machines.

note

Simultaneous multithreading (SMT) is enabled by default. If SMT is not available on your OpenShift Container Platform nodes, the hyperthreading parameter has no effect.

warning

If you disable hyperthreading, whether on your OpenShift Container Platform nodes or in the install-config.yaml file, ensure that your capacity planning accounts for the dramatically decreased machine performance.

compute.replicas: Specifies the number of compute machines that the cluster creates and manages for you on installer-provisioned installations. You must set this value to 0 when you install OpenShift Container Platform on user-provisioned infrastructure. Additionally for user-provisioned installations, you must manually deploy the compute machines before you finish installing the cluster.

note

If you are installing a three-node cluster, do not deploy any compute machines when you install the Red Hat Enterprise Linux CoreOS (RHCOS) machines.

controlPlane.replicas: Specifies the number of control plane machines that you add to the cluster. Because the cluster uses these values as the number of etcd endpoints in the cluster, the value must match the number of control plane machines that you deploy.
metadata.name: Specifies the cluster name that you specified in your DNS records.
networking.clusterNetwork.cidr: Specifies a block of IP addresses from which pod IP addresses are allocated. This block must not overlap with existing physical networks. These IP addresses are used for the pod network. If you need to access the pods from an external network, you must configure load balancers and routers to manage the traffic.

note

Class E CIDR range is reserved for a future use. To use the Class E CIDR range, you must ensure your networking environment accepts the IP addresses within the Class E CIDR range.

networking.cidr.hostPrefix: Specifies the subnet prefix length to assign to each individual node. For example, if hostPrefix is set to 23, then each node is assigned a /23 subnet out of the given cidr, which allows for 510 (2^(32 - 23) - 2) pod IP addresses. If you are required to provide access to nodes from an external network, configure load balancers and routers to manage the traffic.
networking.networkType: Specifies the cluster network plugin to install. The default value OVNKubernetes is the only supported value.
networking.serviceNetwork: Specifies the IP address pool to use for service IP addresses. You can enter only one IP address pool. This block must not overlap with existing physical networks. If you need to access the services from an external network, configure load balancers and routers to manage the traffic.
platform: Specifies the platform. You must set the platform to none. You cannot provide additional platform configuration variables for IBM Z(R) infrastructure.

warning

Clusters that are installed with the platform type none are unable to use some features, such as managing compute machines with the Machine API. This limitation applies even if the compute machines that are attached to the cluster are installed on a platform that would normally support the feature. This parameter cannot be changed after installation.

fips: Specifies either enabling or disabling FIPS mode. By default, FIPS mode is not enabled. If FIPS mode is enabled, the Red Hat Enterprise Linux CoreOS (RHCOS) machines that OpenShift Container Platform runs on bypass the default Kubernetes cryptography suite and use the cryptography modules that are provided with RHCOS instead.

warning

To enable FIPS mode for your cluster, you must run the installation program from a Red Hat Enterprise Linux (RHEL) computer configured to operate in FIPS mode. For more information about configuring FIPS mode on RHEL, see Switching RHEL to FIPS mode.

When running Red Hat Enterprise Linux (RHEL) or Red Hat Enterprise Linux CoreOS (RHCOS) booted in FIPS mode, OpenShift Container Platform core components use the RHEL cryptographic libraries that have been submitted to NIST for FIPS 140-2/140-3 Validation on only the x86_64, ppc64le, and s390x architectures.

pullSecret:: Specifies the registry domain name for <local_registry>, and optionally the port, that your mirror registry uses to serve content. For example, registry.example.com or registry.example.com:5000. For <credentials>, specify the base64-encoded user name and password for your mirror registry.

sshKey:: Specifies the SSH public key for the core user in Red Hat Enterprise Linux CoreOS (RHCOS).

note

For production OpenShift Container Platform clusters on which you want to perform installation debugging or disaster recovery, specify an SSH key that your ssh-agent process uses.

additionalTrustBundle:: Specifies the additionalTrustBundle parameter and value. The value must be the contents of the certificate file that you used for your mirror registry. The certificate file can be an existing, trusted certificate authority or the self-signed certificate that you generated for the mirror registry.

imageContentSources:: Specifies the imageContentSources section according to the output of the command that you used to mirror the repository.

warning

When using the oc adm release mirror command, use the output from the imageContentSources section.
When using oc mirror command, use the repositoryDigestMirrors section of the ImageContentSourcePolicy file that results from running the command.
ImageContentSourcePolicy is deprecated. For more information see Configuring image registry repository mirroring.

Configuring the cluster-wide proxy during installation

Production environments can deny direct access to the internet and instead have an HTTP or HTTPS proxy available. You can configure a new OpenShift Container Platform cluster to use a proxy by configuring the proxy settings in the install-config.yaml file.

Prerequisites

You have an existing install-config.yaml file.
You have reviewed the sites that your cluster requires access to and determined whether any of them need to bypass the proxy. By default, the proxy handles all cluster egress traffic, including calls to hosting cloud provider APIs. You added sites to the Proxy object’s spec.noProxy field to bypass the proxy if necessary.

note
The Proxy object status.noProxy field includes the values of the networking.machineNetwork[].cidr, networking.clusterNetwork[].cidr, and networking.serviceNetwork[] fields from your installation configuration.
For installations on Amazon Web Services (AWS), Google Cloud, Microsoft Azure, and Red Hat OpenStack Platform (RHOSP), the Proxy object status.noProxy field also includes the instance metadata endpoint (169.254.169.254).

Procedure

Edit your install-config.yaml file and add the proxy settings. For example:
```
apiVersion: v1
baseDomain: my.domain.com
proxy:
  httpProxy: http://<username>:<pswd>@<ip>:<port>
  httpsProxy: https://<username>:<pswd>@<ip>:<port>
  noProxy: example.com
additionalTrustBundle: |
    -----BEGIN CERTIFICATE-----
    <MY_TRUSTED_CA_CERT>
    -----END CERTIFICATE-----
additionalTrustBundlePolicy: <policy_to_add_additionalTrustBundle>
# ...
```
where:

proxy.httpProxy

Specifies a proxy URL to use for creating HTTP connections outside the cluster. The URL scheme must be http.

proxy.httpsProxy

Specifies a proxy URL to use for creating HTTPS connections outside the cluster.

proxy.noProxy

Specifies a comma-separated list of destination domain names, IP addresses, or other network CIDRs to exclude from proxying. Preface a domain with . to match subdomains only. For example, .y.com matches x.y.com, but not y.com. Use * to bypass the proxy for all destinations.

additionalTrustBundle

If you specify this value, the installation program generates a config map named user-ca-bundle in the openshift-config namespace to hold the additional CA certificates. If you specify additionalTrustBundle and at least one proxy setting, the Proxy object references the user-ca-bundle config map in the trustedCA field. The Cluster Network Operator then creates a trusted-ca-bundle config map that merges the contents specified for the trustedCA parameter with the RHCOS trust bundle. You must set the additionalTrustBundle field unless an authority from the RHCOS trust bundle signs the proxy’s identity certificate.

additionalTrustBundlePolicy

Specifies the policy that determines the configuration of the Proxy object to reference the user-ca-bundle config map in the trustedCA field. The allowed values are Proxyonly and Always. Use Proxyonly to reference the user-ca-bundle config map only when you configure an http/https proxy. Use Always to always reference the user-ca-bundle config map. The default value is Proxyonly. Optional parameter.

note
The installation program does not support the proxy readinessEndpoints field.
note
If the installation program times out, restart and then complete the deployment by using the wait-for command of the installation program. For example:
$ ./openshift-install wait-for install-complete --log-level debug
Save the file and reference it when installing OpenShift Container Platform. The installation program creates a cluster-wide proxy named cluster that uses the proxy settings in the install-config.yaml file. If you do not give proxy settings, the installation program still creates a cluster Proxy object, but it has a nil spec.

note
Only the Proxy object named cluster is supported, and you cannot create additional proxies.

Configuring a three-node cluster

To create smaller, resource-efficient clusters for testing and production, deploy a bare-metal cluster with zero compute machines. This optional configuration uses only three control plane machines, optimizing infrastructure resources for administrators and developers.

In three-node OpenShift Container Platform environments, the three control plane machines are schedulable, which means that your application workloads run on them.

Prerequisites

You have an existing install-config.yaml file.

Procedure

Ensure that the number of compute replicas is set to 0 in your install-config.yaml file, as shown in the following compute stanza:
```
compute:
- name: worker
  platform: {}
  replicas: 0
# ...
```
note
You must set the value of the replicas parameter for the compute machines to 0 when you install OpenShift Container Platform on user-provisioned infrastructure, regardless of the number of compute machines you deploy. In installer-provisioned installations, the parameter controls the number of compute machines that the cluster creates and manages for you. This does not apply to user-provisioned installations, where you deploy the compute machines manually.

Next steps

For three-node cluster installations, follow these next steps:

If you are deploying a three-node cluster with zero compute nodes, the Ingress Controller pods run on the control plane nodes. In three-node cluster deployments, you must configure your application ingress load balancer to route HTTP and HTTPS traffic to the control plane nodes. See the Load balancing requirements for user-provisioned infrastructure section for more information.
When you create the Kubernetes manifest files in the following procedure, ensure that the mastersSchedulable parameter in the <installation_directory>/manifests/cluster-scheduler-02-config.yml file is set to true. This enables your application workloads to run on the control plane nodes.
Do not deploy any compute nodes when you create the Red Hat Enterprise Linux CoreOS (RHCOS) machines.

Cluster Network Operator configuration

To manage cluster networking, configure the Cluster Network Operator (CNO) Network custom resource (CR) named cluster so the cluster uses the correct IP ranges and network plugin settings for reliable pod and service connectivity.

Some settings and fields are inherited at the time of install or by the default.Network.type plugin, OVN-Kubernetes.

The CNO configuration inherits the following fields during cluster installation from the Network API in the Network.config.openshift.io API group:

clusterNetwork: IP address pools from which pod IP addresses are allocated.
serviceNetwork: IP address pool for services.
defaultNetwork.type: Cluster network plugin. OVNKubernetes is the only supported plugin during installation.

You can specify the cluster network plugin configuration for your cluster by setting the fields for the defaultNetwork object in the CNO object named cluster.

Cluster Network Operator configuration object

The fields for the Cluster Network Operator (CNO) are described in the following table:

Cluster Network Operator configuration object

Field	Type	Description
`metadata.name`	`string`	The name of the CNO object. This name is always `cluster`.
`spec.clusterNetwork`	`array`	A list specifying the blocks of IP addresses from which pod IP addresses are allocated and the subnet prefix length assigned to each individual node in the cluster. If you use dual-stack networking, specify IPv4 and IPv6 address families. For example: `spec: clusterNetwork: - cidr: 10.128.0.0/19 hostPrefix: 23 - cidr: fd01::/48 hostPrefix: 64` If you install a cluster on AWS with dual-stack networking, the order of addresses must match the dual-stack configuration you selected. For example, if you specified the `DualStackIPv4Primary`, list the IPv4 address first.
`spec.serviceNetwork`	`array`	A block of IP addresses for services. If you use dual-stack networking, specify IPv4 and IPv6 address families. For example: `spec: serviceNetwork: - 172.30.0.0/14 - fd02::/112` If you install a cluster on AWS with dual-stack networking, the order of addresses must match the dual-stack configuration you selected. For example, if you specified the `DualStackIPv4Primary`, list the IPv4 address first. You can customize this field only in the `install-config.yaml` file before you create the manifests. The value is read-only in the manifest file.
`spec.defaultNetwork`	`object`	Configures the network plugin for the cluster network.
`spec.additionalRoutingCapabilities.providers`	`array`	This setting enables a dynamic routing provider. The FRR routing capability provider is required for the route advertisement feature. The only supported value is `FRR`. `FRR`: The FRR routing provider `spec: additionalRoutingCapabilities: providers: - FRR`

warning

For a cluster that needs to deploy objects across multiple networks, ensure that you specify the same value for the clusterNetwork.hostPrefix parameter for each network type that is defined in the install-config.yaml file. Setting a different value for each clusterNetwork.hostPrefix parameter can impact the OVN-Kubernetes network plugin, where the plugin cannot effectively route object traffic among different nodes.

defaultNetwork object configuration

The values for the defaultNetwork object are defined in the following table:

defaultNetwork** object**

Field	Type	Description
`type`	`string`	`OVNKubernetes`. The Red Hat OpenShift Networking network plugin is selected during installation. This value cannot be changed after cluster installation. Note OpenShift Container Platform uses the OVN-Kubernetes network plugin by default.
`ovnKubernetesConfig`	`object`	This object is only valid for the OVN-Kubernetes network plugin.

Configuration for the OVN-Kubernetes network plugin

The following table describes the configuration fields for the OVN-Kubernetes network plugin:

ovnKubernetesConfig** object**

Field	Type	Description
`mtu`	`integer`	The maximum transmission unit (MTU) for the Geneve (Generic Network Virtualization Encapsulation) overlay network. This is detected automatically based on the MTU of the primary network interface. You do not normally need to override the detected MTU. If the auto-detected value is not what you expect it to be, confirm that the MTU on the primary network interface on your nodes is correct. You cannot use this option to change the MTU value of the primary network interface on the nodes. If your cluster requires different MTU values for different nodes, you must set this value to `100` less than the lowest MTU value in your cluster. For example, if some nodes in your cluster have an MTU of `9001`, and some have an MTU of `1500`, you must set this value to `1400`.
`genevePort`	`integer`	The port to use for all Geneve packets. The default value is `6081`. This value cannot be changed after cluster installation.
`ipsecConfig`	`object`	Specify a configuration object for customizing the IPsec configuration.
`ipv4`	`object`	Specifies a configuration object for IPv4 settings.
`ipv6`	`object`	Specifies a configuration object for IPv6 settings.
`policyAuditConfig`	`object`	Specify a configuration object for customizing network policy audit logging. If unset, the defaults audit log settings are used.
`routeAdvertisements`	`string`	Specifies whether to advertise cluster network routes. The default value is `Disabled`. `Enabled`: Import routes to the cluster network and advertise cluster network routes as configured in `RouteAdvertisements` objects. `Disabled`: Do not import routes to the cluster network or advertise cluster network routes.
`gatewayConfig`	`object`	Optional: Specify a configuration object for customizing how egress traffic is sent to the node gateway. Valid values are `Shared` and `Local`. The default value is `Shared`. In the default setting, the Open vSwitch (OVS) outputs traffic directly to the node IP interface. If you are using hardware offloading, Red Hat recommends to use the default `Shared` gateway mode to bypass the host routing plane. In the `Local` setting, it traverses the host network; consequently, it gets applied to the routing table of the host. Note While migrating egress traffic, you can expect some disruption to workloads and service traffic until the Cluster Network Operator (CNO) successfully rolls out the changes.

ovnKubernetesConfig.ipv4** object**

Field	Type	Description
`internalTransitSwitchSubnet`	string	If your existing network infrastructure overlaps with the `100.88.0.0/16` IPv4 subnet, you can specify a different IP address range for internal use by OVN-Kubernetes. The subnet for the distributed transit switch that enables east-west traffic. This subnet cannot overlap with any other subnets used by OVN-Kubernetes or on the host itself. It must be large enough to accommodate one IP address per node in your cluster. The default value is `100.88.0.0/16`.
`internalJoinSubnet`	string	If your existing network infrastructure overlaps with the `100.64.0.0/16` IPv4 subnet, you can specify a different IP address range for internal use by OVN-Kubernetes. You must ensure that the IP address range does not overlap with any other subnet used by your OpenShift Container Platform installation. The IP address range must be larger than the maximum number of nodes that can be added to the cluster. For example, if the `clusterNetwork.cidr` value is `10.128.0.0/14` and the `clusterNetwork.hostPrefix` value is `/23`, then the maximum number of nodes is `2^(23-14)=512`. The default value is `100.64.0.0/16`.

ovnKubernetesConfig.ipv6** object**

Field	Type	Description
`internalTransitSwitchSubnet`	string	If your existing network infrastructure overlaps with the `fd97::/64` IPv6 subnet, you can specify a different IP address range for internal use by OVN-Kubernetes. The subnet for the distributed transit switch that enables east-west traffic. This subnet cannot overlap with any other subnets used by OVN-Kubernetes or on the host itself. It must be large enough to accommodate one IP address per node in your cluster. The default value is `fd97::/64`.
`internalJoinSubnet`	string	If your existing network infrastructure overlaps with the `fd98::/64` IPv6 subnet, you can specify a different IP address range for internal use by OVN-Kubernetes. You must ensure that the IP address range does not overlap with any other subnet used by your OpenShift Container Platform installation. The IP address range must be larger than the maximum number of nodes that can be added to the cluster. The default value is `fd98::/64`.

policyAuditConfig** object**

Field	Type	Description
`rateLimit`	integer	The maximum number of messages to generate every second per node. The default value is `20` messages per second.
`maxFileSize`	integer	The maximum size for the audit log in bytes. The default value is `50000000` or 50 MB.
`maxLogFiles`	integer	The maximum number of log files that are retained.
`destination`	string	One of the following additional audit log targets: `libc` The libc `syslog()` function of the journald process on the host. `udp:<host>:<port>` A syslog server. Replace `<host>:<port>` with the host and port of the syslog server. `unix:<file>` A UNIX Domain Socket file specified by `<file>`. `null` Do not send the audit logs to any additional target.
`syslogFacility`	string	The syslog facility, such as `kern`, as defined by RFC5424. The default value is `local0`.

gatewayConfig** object**

Field	Type	Description
`routingViaHost`	`boolean`	Set this field to `true` to send egress traffic from pods to the host networking stack. For highly-specialized installations and applications that rely on manually configured routes in the kernel routing table, you might want to route egress traffic to the host networking stack. By default, egress traffic is processed in OVN to exit the cluster and is not affected by specialized routes in the kernel routing table. The default value is `false`. This field has an interaction with the Open vSwitch hardware offloading feature. If you set this field to `true`, you do not receive the performance benefits of the offloading because egress traffic is processed by the host networking stack.
`ipForwarding`	`object`	You can control IP forwarding for all traffic on OVN-Kubernetes managed interfaces by using the `ipForwarding` specification in the `Network` resource. Specify `Restricted` to only allow IP forwarding for Kubernetes related traffic. Specify `Global` to allow forwarding of all IP traffic. For new installations, the default is `Restricted`. For updates to OpenShift Container Platform 4.14 or later, the default is `Global`. Note The default value of `Restricted` sets the IP forwarding to drop.
`ipv4`	`object`	Optional: Specify an object to configure the internal OVN-Kubernetes masquerade address for host to service traffic for IPv4 addresses.
`ipv6`	`object`	Optional: Specify an object to configure the internal OVN-Kubernetes masquerade address for host to service traffic for IPv6 addresses.

gatewayConfig.ipv4** object**

Field	Type	Description
`internalMasqueradeSubnet`	`string`	The masquerade IPv4 addresses that are used internally to enable host to service traffic. The host is configured with these IP addresses and the shared gateway bridge interface. The default value is `169.254.169.0/29`. Important For OpenShift Container Platform 4.17 and later versions, clusters use `169.254.0.0/17` as the default masquerade subnet. For upgraded clusters, there is no change to the default masquerade subnet.

gatewayConfig.ipv6** object**

Field	Type	Description
`internalMasqueradeSubnet`	`string`	The masquerade IPv6 addresses that are used internally to enable host to service traffic. The host is configured with these IP addresses and the shared gateway bridge interface. The default value is `fd69::/125`. Important For OpenShift Container Platform 4.17 and later versions, clusters use `fd69::/112` as the default masquerade subnet. For upgraded clusters, there is no change to the default masquerade subnet.

ipsecConfig** object**

Field	Type	Description
`mode`	`string`	Specifies the behavior of the IPsec implementation. Must be one of the following values: `Disabled`: IPsec is not enabled on cluster nodes. `External`: IPsec is enabled for network traffic with external hosts. `Full`: IPsec is enabled for pod traffic and network traffic with external hosts.

Example OVN-Kubernetes configuration with IPsec enabled
defaultNetwork:
  type: OVNKubernetes
  ovnKubernetesConfig:
    mtu: 1400
    genevePort: 6081
    ipsecConfig:
      mode: Full

Creating the Kubernetes manifest and Ignition config files

Because you manually provision infrastructure, you must generate the Kubernetes manifest and Ignition config files that the cluster requires.

The installation program converts the installation configuration into Kubernetes manifests and then wraps them into Ignition configuration files. You use these Ignition files to configure the cluster machines.

warning

The Ignition config files that the OpenShift Container Platform installation program generates contain certificates that expire after 24 hours, which the system then renews. If you shut down the cluster before the system renews the certificates and you later restart the cluster after the 24 hours have elapsed, the cluster automatically recovers the expired certificates. The exception is that you must manually approve the pending node-bootstrapper certificate signing requests (CSRs) to recover kubelet certificates. See the documentation for Recovering from expired control plane certificates for more information.
Use Ignition config files within 12 hours after you generate them, because the 24-hour certificate rotates from 16 to 22 hours after you install the cluster. By using the Ignition config files within 12 hours, you can avoid installation failure if the certificate update runs during installation.

note

The installation program that generates the manifest and Ignition files is architecture specific. You can obtain it from the client image mirror. The Linux version of the installation program runs on s390x only. This installation program is also available as a macOS version.

Prerequisites

You obtained the OpenShift Container Platform installation program. For a restricted network installation, these files are on your mirror host.
You created the install-config.yaml installation configuration file.

Procedure

Change to the directory that contains the OpenShift Container Platform installation program and generate the Kubernetes manifests for the cluster:
```
$ ./openshift-install create manifests --dir <installation_directory>
```
where:

<installation_directory>

Specifies the installation directory that contains the install-config.yaml file you created.

warning
If you are installing a three-node cluster, skip the following step to allow the control plane nodes to be schedulable.

warning
When you configure control plane nodes from the default unschedulable to schedulable, you require additional subscriptions because control plane nodes then become compute nodes.
Verify that the mastersSchedulable parameter in the <installation_directory>/manifests/cluster-scheduler-02-config.yml Kubernetes manifest file is set to false. This setting prevents pods from being scheduled on the control plane machines:
1. Open the <installation_directory>/manifests/cluster-scheduler-02-config.yml file.
2. Locate the mastersSchedulable parameter and verify that it is set to false.
3. Save and exit the file.
To create the Ignition configuration files, run the following command from the directory that contains the installation program:
```
$ ./openshift-install create ignition-configs --dir <installation_directory>
```
where:

<installation_directory>

Specifies the same installation directory. The installation program creates Ignition config files for the bootstrap, control plane, and compute nodes in the installation directory. The program also creates the kubeadmin-password and kubeconfig files in the ./<installation_directory>/auth directory:
```
.
├── auth
│   ├── kubeadmin-password
│   └── kubeconfig
├── bootstrap.ign
├── master.ign
├── metadata.json
└── worker.ign
```

Configuring boot volume encryption in an IBM Z or IBM LinuxONE environment

You can optionally encrypt the boot volumes of your OpenShift Container Platform control plane and compute nodes on IBM Z(R) or IBM(R) LinuxONE by using LUKS encryption via IBM(R) Crypto Express (CEX) or Network Bound Disk Encryption (NBDE).

Linux Unified Key Setup (LUKS) encryption via IBM(R) Crypto Express (CEX)
Network Bound Disk Encryption (NBDE)

LUKS encryption via CEX in an IBM Z or IBM LinuxONE environment

Enabling hardware-based Linux Unified Key Setup (LUKS) encryption via IBM(R) Crypto Express (CEX) in an IBM Z(R) or IBM(R) LinuxONE environment requires additional steps.

Prerequisites

You have installed the butane utility.
You have reviewed the instructions for how to create machine configs with Butane.

Procedure

    . Choose the appropriate method to create Butane configuration files for the control plane and compute nodes:
    ** For installations on DASD-type disks, create a file named `main-storage.bu` by using the following Butane configuration for a control plane node with disk encryption, for example:
    +
    ```yaml
    variant: openshift
    version: 4.22.0
    metadata:
      name: main-storage
      labels:
        machineconfiguration.openshift.io/role: master
    boot_device:
      layout: s390x-eckd
      luks:
        device: /dev/dasda
        cex:
          enabled: true
    openshift:
      fips: true
      kernel_arguments:
        - rd.luks.key=/etc/luks/cex.key
    ```
   \
    where:

openshift.fips

Specifies whether to enable or disable FIPS mode. By default, FIPS mode is not enabled. If FIPS mode is enabled, the Red Hat Enterprise Linux CoreOS (RHCOS) machines that OpenShift Container Platform runs on bypass the default Kubernetes cryptography suite and use the cryptography modules that are provided with RHCOS instead.

openshift.kernel_arguments

Specifies the location of the key that is required to decrypt the device. You cannot change this value.

For installations on FCP-type disks, create a file named main-storage.bu by using the following Butane configuration for a control plane node with disk encryption, for example:

variant: openshift
version: 4.22.0
metadata:
  name: main-storage
  labels:
    machineconfiguration.openshift.io/role: master
storage:
  filesystems:
    - device: /dev/mapper/root
      format: xfs
      label: root
      wipe_filesystem: true
  luks:
    - device: /dev/disk/by-label/root
      label: luks-root
      name: root
      wipe_volume: true
      cex:
        enabled: true
openshift:
  fips: true
  kernel_arguments:
    - rd.luks.key=/etc/luks/cex.key

where:

openshift.fips

openshift.kernel_arguments

Specifies the location of the key that is required to decrypt the device. You cannot change this value.

Create a parameter file that includes ignition.platform.id=metal and ignition.firstboot. Example kernel parameter file for the control plane machine
```
cio_ignore=all,!condev rd.neednet=1 \
console=ttysclp0 \
coreos.inst.install_dev=/dev/disk/by-id/scsi-<serial_number> \
ignition.firstboot ignition.platform.id=metal \
coreos.inst.ignition_url=http://<http_server>/master.ign \
coreos.live.rootfs_url=http://<http_server>/rhcos-<version>-live-rootfs.<architecture>.img \
ip=<ip_address>::<gateway>:<netmask>:<hostname>::none nameserver=<dns> \
rd.znet=qeth,0.0.bdd0,0.0.bdd1,0.0.bdd2,layer2=1 \
rd.zfcp=0.0.5677,0x600606680g7f0056,0x034F000000000000
```
where:

coreos.inst.install_dev

Specifies a unique fully qualified path depending on disk type. This can be DASD-type or FCP-type disks.

coreos.inst.ignition_url

Specifies the location of the Ignition configuration file. Use master.ign or worker.ign. You can only use the HTTP and HTTPS protocols.

coreos.live.rootfs_url

Specifies the location of the rootfs artifact for the kernel and initramfs that you want to boot. You can only use the HTTP and HTTPS protocols.

rd.zfcp

Specifies the FCP device. For installations on DASD-type disks, replace with rd.dasd=0.0.xxxx to specify the DASD device.

note
Write all options in the parameter file as a single line and make sure you have no newline characters.

Configuring NBDE with static IP in an IBM Z or IBM LinuxONE environment

Enabling NBDE disk encryption in an IBM Z(R) or IBM(R) LinuxONE environment requires additional steps.

Prerequisites

You have set up the External Tang Server. See Network-bound disk encryption for instructions.
You have installed the butane utility.
You have reviewed the instructions for how to create machine configs with Butane.

Procedure

Create Butane configuration files for the control plane and compute nodes. The following example of a Butane configuration for a control plane node creates a file named master-storage.bu for disk encryption:
```
variant: openshift
version: 4.22.0
metadata:
  name: master-storage
  labels:
    machineconfiguration.openshift.io/role: master
storage:
  luks:
    - clevis:
        tang:
          - thumbprint: QcPr_NHFJammnRCA3fFMVdNBwjs
            url: http://clevis.example.com:7500
      device: /dev/disk/by-partlabel/root
      label: luks-root
      name: root
      wipe_volume: true
  filesystems:
    - device: /dev/mapper/root
      format: xfs
      label: root
      wipe_filesystem: true
openshift:
  fips: true
```
where:

storage.luks.device

Specifies the device to encrypt. For installations on DASD-type disks, replace with device: /dev/disk/by-label/root.

openshift.fips

Specifies whether to enable or disable FIPS mode. By default, FIPS mode is not enabled. If FIPS mode is enabled, the Red Hat Enterprise Linux CoreOS (RHCOS) machines that OpenShift Container Platform runs on bypass the default Kubernetes cryptography suite and use the cryptography modules that are provided with RHCOS instead.

Create a customized initramfs file to boot the machine, by running the following command:

$ coreos-installer pxe customize \
    /root/rhcos-bootfiles/rhcos-<release>-live-initramfs.s390x.img \
    --dest-device /dev/disk/by-id/scsi-<serial_number> --dest-karg-append \
    ip=<ip_address>::<gateway_ip>:<subnet_mask>::<network_device>:none \
    --dest-karg-append nameserver=<nameserver_ip> \
    --dest-karg-append rd.neednet=1 -o \
    /root/rhcos-bootfiles/<node_name>-initramfs.s390x.img

note

Before first boot, you must customize the initramfs for each node in the cluster, and add PXE kernel parameters.

Create a parameter file that includes ignition.platform.id=metal and ignition.firstboot. Example kernel parameter file for the control plane machine
```
cio_ignore=all,!condev rd.neednet=1 \
console=ttysclp0 \
coreos.inst.install_dev=/dev/<block_device> \
ignition.firstboot ignition.platform.id=metal \
coreos.inst.ignition_url=http://<http_server>/master.ign \
coreos.live.rootfs_url=http://<http_server>/rhcos-<version>-live-rootfs.<architecture>.img \
ip=<ip>::<gateway>:<netmask>:<hostname>::none nameserver=<dns> \
rd.znet=qeth,0.0.bdd0,0.0.bdd1,0.0.bdd2,layer2=1 \
rd.zfcp=0.0.5677,0x600606680g7f0056,0x034F000000000000 \
zfcp.allow_lun_scan=0
```
where:

coreos.inst.install_dev

Specifies the block device type. For installations on DASD-type disks, specify /dev/dasda. For installations on FCP-type disks, specify /dev/sda. For installations on NVMe-type disks, specify /dev/nvme0n1.

coreos.inst.ignition_url

Specifies the location of the Ignition config file. Use master.ign or worker.ign. Only HTTP and HTTPS protocols are supported.

coreos.live.rootfs_url

Specifies the location of the rootfs artifact for the kernel and initramfs you are booting. Only HTTP and HTTPS protocols are supported.

rd.zfcp

Specifies the FCP device. For installations on DASD-type disks, replace with rd.dasd=0.0.xxxx to specify the DASD device.

note
Write all options in the parameter file as a single line and make sure you have no newline characters.

Additional resources

Creating machine configs with Butane

Installing RHCOS and starting the OpenShift Container Platform bootstrap process

To install OpenShift Container Platform on IBM Z(R) infrastructure that you provision, you must install Red Hat Enterprise Linux CoreOS (RHCOS) in an LPAR.

When you install RHCOS, you must provide the Ignition config file that was generated by the OpenShift Container Platform installation program for the type of machine you are installing. If you have configured suitable networking, DNS, and load balancing infrastructure, the OpenShift Container Platform bootstrap process begins automatically after the RHCOS guest machines have rebooted.

Complete the following steps to create the machines.

Prerequisites

An HTTP or HTTPS server running on your provisioning machine that is accessible to the machines you create.
If you want to enable secure boot, you have obtained the appropriate Red Hat Product Signing Key and read Secure boot on IBM Z and IBM LinuxONE in IBM(R) documentation.

Procedure

Log in to Linux on your provisioning machine.
Obtain the Red Hat Enterprise Linux CoreOS (RHCOS) kernel, initramfs, and rootfs files from the RHCOS image mirror.

warning
The RHCOS images might not change with every release of OpenShift Container Platform. You must download images with the highest version that is less than or equal to the OpenShift Container Platform version that you install. Only use the appropriate kernel, initramfs, and rootfs artifacts described in the following procedure.

The file names contain the OpenShift Container Platform version number. They resemble the following examples:
- kernel: rhcos-<version>-live-kernel-<architecture>
- initramfs: rhcos-<version>-live-initramfs.<architecture>.img
- rootfs: rhcos-<version>-live-rootfs.<architecture>.img
  
  note
  The rootfs image is the same for FCP and DASD.
Create parameter files. The following parameters are specific for a particular virtual machine:
- For ip=, specify the following seven entries:
  1. The IP address for the machine.
  2. An empty string.
  3. The gateway.
  4. The netmask.
  5. The machine host and domain name in the form hostname.domainname. If you omit this value, RHCOS obtains the hostname through a reverse DNS lookup.
  6. The network interface name. If you omit this value, RHCOS applies the IP configuration to all available interfaces.
  7. If you use static IP addresses, specify none.
- For coreos.inst.ignition_url=, specify the Ignition file for the machine role. Use bootstrap.ign, master.ign, or worker.ign. Only HTTP and HTTPS protocols are supported.
- For coreos.live.rootfs_url=, specify the matching rootfs artifact for the kernel and initramfs you are booting. Only HTTP and HTTPS protocols are supported.
- Optional: To enable secure boot, add coreos.inst.secure_ipl
- For installations on DASD-type disks, complete the following tasks:
  1. For coreos.inst.install_dev=, specify /dev/disk/by-path/ccw-<device_id>. For <device_id> specify, for example, 0.0.1000.
  2. Use rd.dasd= to specify the DASD where RHCOS is to be installed.
  3. Leave all other parameters unchanged. Example parameter file, bootstrap-0.parm, for the bootstrap machine:
    cio_ignore=all,!condev rd.neednet=1 \ console=ttysclp0 \ coreos.inst.install_dev=/dev/disk/by-id/scsi-<serial_number> \ coreos.inst.ignition_url=http://<http_server>/bootstrap.ign \ coreos.live.rootfs_url=http://<http_server>/rhcos-<version>-live-rootfs.<architecture>.img \ coreos.inst.secure_ipl \ ip=<ip>::<gateway>:<netmask>:<hostname>::none nameserver=<dns> \ rd.znet=qeth,0.0.bdf0,0.0.bdf1,0.0.bdf2,layer2=1,portno=0 \ rd.dasd=0.0.3490
    where:
    
    coreos.inst.install_dev
    
    Specifies a unique fully qualified path depending on disk type. This can be either DASD-type, FCP-type, or NVMe-type disks.
    
    coreos.inst.ignition_url
    
    Specifies the location of the Ignition config file. Use bootstrap.ign, master.ign, or worker.ign. Only HTTP and HTTPS protocols are supported.
    
    coreos.live.rootfs_url
    
    Specifies the location of the rootfs artifact for the kernel and initramfs you are booting. Only HTTP and HTTPS protocols are supported.
    
    coreos.inst.secure_ipl
    
    Specifies the coreos.inst.secure_ipl artifact. Optional: To enable secure boot, add coreos.inst.secure_ipl. Write all options in the parameter file as a single line and make sure you have no newline characters.
- For installations on FCP-type disks, complete the following tasks:
  1. Use rd.zfcp=<adapter>,<wwpn>,<lun> to specify the FCP disk where RHCOS is to be installed. For multipathing repeat this step for each additional path.
    
    note
    When you install with multiple paths, you must enable multipathing directly after the installation, not at a later point in time, as this can cause problems.
  2. Set the install device as: coreos.inst.install_dev=/dev/disk/by-id/scsi-<serial_number>.
Optional: Create a generic.ins file: Some installation methods also require a generic.ins file with a mapping of the location of the installation data in the file system of the Hardware Management Console (HMC), the DVD, or the FTP server and the memory locations where the data is to be copied. A sample generic.ins file is provided with the RHEL installation media. The file contains file names for the initial RAM disk (initrd.img), the kernel image (kernel.img), and the parameter (generic.prm) files and a memory location for each file.
Example generic.ins file
```
images/kernel.img 0x00000000
images/initrd.img 0x02000000
images/genericdvd.prm 0x00010480
images/initrd.addrsize 0x00010408
```

Leave all other parameters unchanged.

warning

Additional postinstallation steps are required to fully enable multipathing. For more information, see “Enabling multipathing with kernel arguments on RHCOS" in Machine configuration.

The following is an example parameter file worker-1.parm for a compute node with multipathing:

cio_ignore=all,!condev rd.neednet=1 \
console=ttysclp0 \
coreos.inst.install_dev=/dev/disk/by-id/scsi-<serial_number> \
coreos.live.rootfs_url=http://<http_server>/rhcos-<version>-live-rootfs.<architecture>.img \
coreos.inst.ignition_url=http://<http_server>/worker.ign \
ip=<ip>::<gateway>:<netmask>:<hostname>::none nameserver=<dns> \
rd.znet=qeth,0.0.bdf0,0.0.bdf1,0.0.bdf2,layer2=1,portno=0 \
rd.zfcp=0.0.1987,0x50050763070bc5e3,0x4008400B00000000 \
rd.zfcp=0.0.19C7,0x50050763070bc5e3,0x4008400B00000000 \
rd.zfcp=0.0.1987,0x50050763071bc5e3,0x4008400B00000000 \
rd.zfcp=0.0.19C7,0x50050763071bc5e3,0x4008400B00000000

Write all options in the parameter file as a single line and make sure you have no newline characters.

Transfer the initramfs, kernel, parameter files, and RHCOS images to the LPAR, for example with FTP. For details about how to transfer the files with FTP and boot, see Booting the installation on IBM Z(R) to install RHEL in an LPAR.
Boot the machine
Repeat this procedure for the other machines in the cluster.

Networking and bonding options for ISO installations

You can configure advanced options so that you can modify the Red Hat Enterprise Linux CoreOS (RHCOS) manual installation process. The subsequent sections show examples of networking options for an ISO installation.

If you install RHCOS from an ISO image, you can add kernel arguments manually when you boot the image to configure networking for a node. If no networking arguments are specified, DHCP is activated in the initramfs when RHCOS detects that networking is required to fetch the Ignition config file.

warning

When adding networking arguments manually, you must also add the rd.neednet=1 kernel argument to bring the network up in the initramfs.

The following information provides examples for configuring networking and bonding on your RHCOS nodes for ISO installations. The examples describe how to use the ip=, nameserver=, and bond= kernel arguments.

note

Ordering is important when adding the kernel arguments: ip=, nameserver=, and then bond=.

The networking options are passed to the dracut tool during system boot. For more information about the networking options supported by dracut, see dracut.cmdline manual page.

Additional resources

dracut.cmdline manual page

Configuring DHCP or static IP addresses

You can configure an IP address by using either DHCP or an individual static IP address. If you set a static IP, you must then identify the DNS server IP address on each node.

The configuration examples in the procedure, update the IP addresses for the following components:

The node’s IP address to 10.10.10.2
The gateway address to 10.10.10.254
The netmask to 255.255.255.0
The hostname to core0.example.com
The DNS server address to 4.4.4.41
The auto-configuration value to none. No auto-configuration is required when IP networking is configured statically.

Procedure

Enter a command like the following command to configure a static IP address:

ip=10.10.10.2::10.10.10.254:255.255.255.0:core0.example.com:enp1s0:none
nameserver=4.4.4.41

Enter a command like the following command to configure a DHCP IP address:
```
ip=enp1s0:dhcp
```
note
When you use DHCP to configure IP addressing for the RHCOS machines, the machines also obtain the DNS server information through DHCP. For DHCP-based deployments, you can define the DNS server address that is used by the RHCOS nodes through your DHCP server configuration.
If two or more network interfaces and only one interface exists, disable DHCP on a single interface. In the example, the enp1s0 interface has a static networking configuration and DHCP is disabled for enp2s0, which is not used:
```
ip=10.10.10.2::10.10.10.254:255.255.255.0:core0.example.com:enp1s0:none
ip=::::core0.example.com:enp2s0:none
```
If you need to combine DHCP and static IP configurations on systems with multiple network interfaces, run the following example command:
```
ip=enp1s0:dhcp
ip=10.10.10.2::10.10.10.254:255.255.255.0:core0.example.com:enp2s0:none
```

Configuring an IP address without a static hostname

You can configure an IP address without assigning a static hostname. If a static hostname is not set by the user, the static hostname gets picked up and automatically set by a reverse DNS lookup.

The configuration examples in the procedure, update the IP addresses for the following components:

The node’s IP address to 10.10.10.2
The gateway address to 10.10.10.254
The netmask to 255.255.255.0
The DNS server address to 4.4.4.41
The auto-configuration value to none. No auto-configuration is required when IP networking is configured statically.

Procedure

To configure an IP address without a static hostname, enter a command like the following command:
```
ip=10.10.10.2::10.10.10.254:255.255.255.0::enp1s0:none
nameserver=4.4.4.41
```

Specifying multiple network interfaces and DNS servers

You can specify multiple network interfaces by setting multiple ip= entries. You can provide multiple DNS servers by adding a nameserver= entry for each server,

Procedure

To specify multiple network interfaces for your interfaces, you can enter a command like the following command:

ip=10.10.10.2::10.10.10.254:255.255.255.0:core0.example.com:enp1s0:none
ip=10.10.10.3::10.10.10.254:255.255.255.0:core0.example.com:enp2s0:none

To provide multiple DNS servers by adding a nameserver= entry for each server, enter a command like the following command:
```
nameserver=1.1.1.1
nameserver=8.8.8.8
```

Configuring default gateway and route

As an optional task, you can configure routes to additional networks by setting an rd.route= value.

note

When you configure one or multiple networks, one default gateway is required. If the additional network gateway is different from the primary network gateway, the default gateway must be the primary network gateway.

Procedure

To configure the default gateway, enter the following command:
```
ip=::10.10.10.254::::
```
To configure the route for an additional network, enter the following command:
```
rd.route=20.20.20.0/24:20.20.20.254:enp2s0
```

Configuring VLANs on individual interfaces

As an optional task, you can configure VLANs on individual interfaces by using the vlan= parameter.

Procedure

To configure a VLAN on a network interface and use a static IP address, run the following command:
```
ip=10.10.10.2::10.10.10.254:255.255.255.0:core0.example.com:enp2s0.100:none
vlan=enp2s0.100:enp2s0
```
To configure a VLAN on a network interface and to use DHCP, run the following command:
```
ip=enp2s0.100:dhcp
vlan=enp2s0.100:enp2s0
```

Bonding multiple network interfaces to a single interface

As an optional task, you can bond multiple network interfaces to a single interface by using the bond= option.

The following example demonstrates editing the /etc/config/network file and specifying the following syntax for bonding multiple network interfaces to a single interface:

bond=<name>[:<network_interfaces>][:<options>]

<name>: Specifies the bonding device name, for example bond0.
<network_interfaces>: Specifies a comma-separated list of physical (ethernet) interfaces, such as em1,em2.
<options>: Specifies a comma-separated list of bonding options. Enter the modinfo bonding` command to see available options.

When you create a bonded interface using the bond= command, you must specify how the IP address is assigned and other information for the bonded interface.

Procedure

To configure the bonded interface to use DHCP, edit the /etc/config/network file by setting the IP address for the bond to dhcp. For example:
```
ip=bond0:dhcp
```
To configure the bonded interface to use a static IP address, edit the /etc/config/network file entering the specific IP address you want and related information. For example:
```
bond=bond0:em1,em2:mode=active-backup
ip=10.10.10.2::10.10.10.254:255.255.255.0:core0.example.com:bond0:none::AA:BB:CC:DD:EE:FF ip=em1:none::AA:BB:CC:DD:EE:FF
ip=em2:none::AA:BB:CC:DD:EE:FF
```
IBM Z supports value 1 for the fail_over_mac parameter, so always set the fail_over_mac=1 option in active-backup mode to avoid problems when shared OSA/RoCE cards are used.
You can configure VLANs on bonded interfaces by editing the /etc/config/network file and specifying the vlan= parameter to use DHCP. For example:
```
ip=bond0.100:dhcp
bond=bond0:em1,em2:mode=active-backup
vlan=bond0.100:bond0
```

To configure the bonded interface with a VLAN, edit the /etc/config/network file and specify a static IP address. For example:

ip=10.10.10.2::10.10.10.254:255.255.255.0:core0.example.com:bond0.100:none
bond=bond0:em1,em2:mode=active-backup
vlan=bond0.100:bond0

Using network teaming

You can use network teaming as an alternative to bonding by using the team= parameter.

Procedure

Optional: You can use network teaming as an alternative to bonding by using the team= parameter.
- The syntax for configuring a team interface is: team=name[:network_interfaces] name is the team device name (team0) and network_interfaces represents a comma-separated list of physical (ethernet) interfaces (em1, em2).
  
  note
  Teaming is planned to be deprecated when RHCOS switches to an upcoming version of RHEL. For more information, see this Red Hat Knowledgebase Article.
  
  Use the following example to configure a network team:
```
team=team0:em1,em2
ip=team0:dhcp
```

Waiting for the bootstrap process to complete

After your cluster nodes first boot into the persistent RHCOS environment installed to disk, wait for the OpenShift Container Platform bootstrap process to complete.

The configuration information provided through the Ignition config files is used to initialize the bootstrap process and install OpenShift Container Platform on the machines.

Prerequisites

You have created the Ignition config files for your cluster.
You have configured suitable network, DNS, and load balancing infrastructure.
You have obtained the installation program and generated the Ignition config files for your cluster.
You installed RHCOS on your cluster machines and provided the Ignition config files that the OpenShift Container Platform installation program generated.

Procedure

Monitor the bootstrap process:
```
$ ./openshift-install --dir <installation_directory> wait-for bootstrap-complete \
    --log-level=info
```
where:

<installation_directory>

Specifies the path to the directory that stores the installation files.

--log-level=info

Specifies warn, debug, or error instead of info to view different installation details.
Example output
```
INFO Waiting up to 20m0s for the Kubernetes API at https://api.test.example.com:6443...
INFO API v1.35.4 up
INFO Waiting up to 1h0m0s for bootstrapping to complete...
INFO It is now safe to remove the bootstrap resources
```
The bootstrapping completion wait time varies per platform. The command succeeds when the Kubernetes API server signals that it has been bootstrapped on the control plane machines.
After the bootstrap process is complete, remove the bootstrap machine from the load balancer.

warning
You must remove the bootstrap machine from the load balancer at this point. You can also remove or reformat the bootstrap machine itself.

Logging in to the cluster by using the CLI

To log in to your cluster as the default system user, export the kubeconfig file. This configuration enables the CLI to authenticate and connect to the specific API server created during OpenShift Container Platform installation.

The kubeconfig file is specific to a cluster and OpenShift Container Platform generates it during installation.

Prerequisites

You deployed an OpenShift Container Platform cluster.
You installed the OpenShift CLI (oc).

Procedure

Export the kubeadmin credentials by running the following command:
```
$ export KUBECONFIG=<installation_directory>/auth/kubeconfig
```
where:

<installation_directory>

Specifies the path to the directory that stores the installation files.
Verify you can run oc commands successfully using the exported configuration by running the following command:
```
$ oc whoami
```
Example output
```
system:admin
```

Next steps

"Customize your cluster"
"Remote health reporting"

Approve the certificate signing requests for your machines

To allow newly added machines to join your OpenShift Container Platform cluster, confirm that the cluster approves pending certificate signing requests (CSRs), or approve them yourself. Approve client requests first, then server requests.

Prerequisites

You added machines to your cluster.

Procedure

Confirm that the cluster recognizes the machines:
```
$ oc get nodes
```
Example output
```
NAME      STATUS    ROLES   AGE  VERSION
master-0  Ready     master  63m  v1.35.4
master-1  Ready     master  63m  v1.35.4
master-2  Ready     master  64m  v1.35.4
```
The output lists all of the machines that you created.

note
The preceding output might not include the compute nodes until you approve some CSRs.

Review the pending CSRs and ensure that you see the client requests with the Pending or Approved status for each machine that you added to the cluster:

$ oc get csr

Example output
NAME        AGE     REQUESTOR                                                                   CONDITION
csr-8b2br   15m     system:serviceaccount:openshift-machine-config-operator:node-bootstrapper   Pending
csr-8vnps   15m     system:serviceaccount:openshift-machine-config-operator:node-bootstrapper   Pending
...

In this example, two machines are joining the cluster. You might see more approved CSRs in the list.

If the CSRs were not approved, after all of the pending CSRs for the machines you added are in Pending status, approve the CSRs for your cluster machines:

note
You must approve your CSRs within an hour of adding the machines to the cluster. If you do not approve them within an hour, the certificates rotate, and more than two certificates are present for each node. You must approve all of these certificates. After you approve the client CSR, the kubelet creates a secondary CSR for the serving certificate, which requires manual approval. The machine-approver then automatically approves later serving certificate renewal requests if the kubelet requests a new certificate with the same parameters.

note
For clusters running on platforms that are not machine API enabled, such as bare metal and other user-provisioned infrastructure, you must implement a method of automatically approving the kubelet serving certificate requests (CSRs). If you do not approve a request, the oc exec, oc rsh, and oc logs commands cannot succeed, because the API server requires a serving certificate when it connects to the kubelet. Any operation that contacts the kubelet endpoint requires this certificate approval to be in place. The method must watch for new CSRs, confirm that the node-bootstrapper service account in the system:node or system:admin groups submitted the CSR, and confirm the identity of the node.
- To approve them individually, run the following command for each valid CSR:
```
$ oc adm certificate approve <csr_name>
```
  where:
  
  <csr_name>
  
  Specifies the name of a CSR from the list of current CSRs.
- To approve all pending CSRs, run the following command:
```
$ oc get csr -o go-template='{{range .items}}{{if not .status}}{{.metadata.name}}{{"\n"}}{{end}}{{end}}' | xargs --no-run-if-empty oc adm certificate approve
```
  note
  Some Operators might not become available until you approve some CSRs. Each node submits two CSRs, so you might need to run the command to approve CSRs many times.

After you approve your client requests, review the server requests for each machine that you added to the cluster:

$ oc get csr

Example output
NAME        AGE     REQUESTOR                                                                   CONDITION
csr-bfd72   5m26s   system:node:ip-10-0-50-126.us-east-2.compute.internal                       Pending
csr-c57lv   5m26s   system:node:ip-10-0-95-157.us-east-2.compute.internal                       Pending
...

If the remaining CSRs are not approved, and are in the Pending status, approve the CSRs for your cluster machines:
- To approve them individually, run the following command for each valid CSR:
```
$ oc adm certificate approve <csr_name>
```
  where:
  
  <csr_name>
  
  Specifies the name of a CSR from the list of current CSRs.
- To approve all pending CSRs, run the following command:
```
$ oc get csr -o go-template='{{range .items}}{{if not .status}}{{.metadata.name}}{{"\n"}}{{end}}{{end}}' | xargs oc adm certificate approve
```
After you approve all client and server CSRs, the machines have the Ready status. Verify this by running the following command:
```
$ oc get nodes
```
Example output
```
NAME      STATUS    ROLES   AGE  VERSION
master-0  Ready     master  73m  v1.35.4
master-1  Ready     master  73m  v1.35.4
master-2  Ready     master  74m  v1.35.4
worker-0  Ready     worker  11m  v1.35.4
worker-1  Ready     worker  11m  v1.35.4
```
note
You might need to wait a few minutes after approval of the server CSRs for the machines to reach the Ready status.

Initial Operator configuration

After the control plane initializes, you must immediately configure some Operators so that they all become available.

Prerequisites

Your control plane has initialized.

Procedure

Watch the cluster components come online:

$ watch -n5 oc get clusteroperators

Example output
NAME                                       VERSION   AVAILABLE   PROGRESSING   DEGRADED   SINCE
authentication                             4.22.0    True        False         False      19m
baremetal                                  4.22.0    True        False         False      37m
cloud-credential                           4.22.0    True        False         False      40m
cluster-autoscaler                         4.22.0    True        False         False      37m
config-operator                            4.22.0    True        False         False      38m
console                                    4.22.0    True        False         False      26m
csi-snapshot-controller                    4.22.0    True        False         False      37m
dns                                        4.22.0    True        False         False      37m
etcd                                       4.22.0    True        False         False      36m
image-registry                             4.22.0    True        False         False      31m
ingress                                    4.22.0    True        False         False      30m
insights                                   4.22.0    True        False         False      31m
kube-apiserver                             4.22.0    True        False         False      26m
kube-controller-manager                    4.22.0    True        False         False      36m
kube-scheduler                             4.22.0    True        False         False      36m
kube-storage-version-migrator              4.22.0    True        False         False      37m
machine-api                                4.22.0    True        False         False      29m
machine-approver                           4.22.0    True        False         False      37m
machine-config                             4.22.0    True        False         False      36m
marketplace                                4.22.0    True        False         False      37m
monitoring                                 4.22.0    True        False         False      29m
network                                    4.22.0    True        False         False      38m
node-tuning                                4.22.0    True        False         False      37m
openshift-apiserver                        4.22.0    True        False         False      32m
openshift-controller-manager               4.22.0    True        False         False      30m
openshift-samples                          4.22.0    True        False         False      32m
operator-lifecycle-manager                 4.22.0    True        False         False      37m
operator-lifecycle-manager-catalog         4.22.0    True        False         False      37m
operator-lifecycle-manager-packageserver   4.22.0    True        False         False      32m
service-ca                                 4.22.0    True        False         False      38m
storage                                    4.22.0    True        False         False      37m

Configure the Operators that are not available.

Disabling the default software catalog sources

To use only trusted or locally available Operator catalogs, disable the default software catalog sources that OpenShift Container Platform configures during installation. In a restricted network environment, you must disable the default catalogs as a cluster administrator.

Procedure

Disable the sources for the default catalogs by adding disableAllDefaultSources: true to the OperatorHub object:
```
$ oc patch OperatorHub cluster --type json \
    -p '[{"op": "add", "path": "/spec/disableAllDefaultSources", "value": true}]'
```
tip
Or, you can use the web console to manage catalog sources. From the Administration → Cluster Settings → Configuration → OperatorHub page, click the Sources tab, where you can create, update, delete, disable, and enable individual sources.

Image registry storage configuration

The Image Registry Operator is not initially available for platforms that do not provide default storage. After installation, you must configure your registry to use storage so that the Registry Operator is made available.

Configure a persistent volume, which is required for production clusters. Where applicable, you can configure an empty directory as the storage location for non-production clusters.

You can also allow the image registry to use block storage types by using the Recreate rollout strategy during upgrades.

Configure registry storage for IBM Z

As a cluster administrator, following installation you must configure your registry to use storage.

Prerequisites

You have access to the cluster as a user with the cluster-admin role.
You have a cluster on IBM Z(R).
You have provisioned persistent storage for your cluster, such as Red Hat OpenShift Data Foundation.

warning
OpenShift Container Platform supports ReadWriteOnce access for image registry storage when you have only one replica. ReadWriteOnce access also requires that the registry uses the Recreate rollout strategy. To deploy an image registry that supports high availability with two or more replicas, ReadWriteMany access is required.
You must have a system with at least 100Gi capacity.

Procedure

To configure your registry to use storage, change the spec.storage.pvc in the configs.imageregistry/cluster resource.

note
When you use shared storage, review your security settings to prevent outside access.
Verify that you do not have a registry pod:
```
$ oc get pod -n openshift-image-registry -l docker-registry=default
```
Example output
```
No resources found in openshift-image-registry namespace
```
note
If you do have a registry pod in your output, you do not need to continue with this procedure.
Check the registry configuration:
```
$ oc edit configs.imageregistry.operator.openshift.io
```
Example output
```
storage:
  pvc:
    claim:
```
Leave the claim field blank to allow the automatic creation of an image-registry-storage PVC.

Check the clusteroperator status:

$ oc get clusteroperator image-registry

Example output
NAME             VERSION              AVAILABLE   PROGRESSING   DEGRADED   SINCE   MESSAGE
image-registry   4.22                 True        False         False      6h50m

Ensure that your registry is set to managed to enable building and pushing of images.
- Run:
```
$ oc edit configs.imageregistry/cluster
```
  Then, change the line
```
managementState: Removed
```
  to
```
managementState: Managed
```

Configure storage for the image registry in non-production clusters

You must configure storage for the Image Registry Operator. For non-production clusters, you can set the image registry to an empty directory, but you lose all images if you restart the registry.

Procedure

To set the image registry storage to an empty directory:
```
$ oc patch configs.imageregistry.operator.openshift.io cluster --type merge --patch '{"spec":{"storage":{"emptyDir":{}}}}'
```
warning
Configure this option only for non-production clusters.

If you run this command before the Image Registry Operator initializes its components, the oc patch command fails with the following error:
Example output
```
Error from server (NotFound): configs.imageregistry.operator.openshift.io "cluster" not found
```
Wait a few minutes and run the command again.

Completing installation on user-provisioned infrastructure

To finalize the installation on user-provisioned infrastructure, complete the cluster deployment after configuring the Operators. This ensures the cluster is fully operational on the infrastructure that you provide.

Prerequisites

Your control plane has initialized.
You have completed the initial Operator configuration.

Procedure

Confirm that all the cluster components are online with the following command:

$ watch -n5 oc get clusteroperators

Example output
NAME                                       VERSION   AVAILABLE   PROGRESSING   DEGRADED   SINCE
authentication                             4.22.0    True        False         False      19m
baremetal                                  4.22.0    True        False         False      37m
cloud-credential                           4.22.0    True        False         False      40m
cluster-autoscaler                         4.22.0    True        False         False      37m
config-operator                            4.22.0    True        False         False      38m
console                                    4.22.0    True        False         False      26m
csi-snapshot-controller                    4.22.0    True        False         False      37m
dns                                        4.22.0    True        False         False      37m
etcd                                       4.22.0    True        False         False      36m
image-registry                             4.22.0    True        False         False      31m
ingress                                    4.22.0    True        False         False      30m
insights                                   4.22.0    True        False         False      31m
kube-apiserver                             4.22.0    True        False         False      26m
kube-controller-manager                    4.22.0    True        False         False      36m
kube-scheduler                             4.22.0    True        False         False      36m
kube-storage-version-migrator              4.22.0    True        False         False      37m
machine-api                                4.22.0    True        False         False      29m
machine-approver                           4.22.0    True        False         False      37m
machine-config                             4.22.0    True        False         False      36m
marketplace                                4.22.0    True        False         False      37muser
monitoring                                 4.22.0    True        False         False      29m
network                                    4.22.0    True        False         False      38m
node-tuning                                4.22.0    True        False         False      37m
openshift-apiserver                        4.22.0    True        False         False      32muser
openshift-controller-manager               4.22.0    True        False         False      30m
openshift-samples                          4.22.0    True        False         False      32m
operator-lifecycle-manager                 4.22.0    True        False         False      37m
operator-lifecycle-manager-catalog         4.22.0    True        False         False      37m
operator-lifecycle-manager-packageserver   4.22.0    True        False         False      32m
service-ca                                 4.22.0    True        False         False      38m
storage                                    4.22.0    True        False         False      37m

Alternatively, the following command notifies you when all of the clusters are available. The command also retrieves and displays credentials:

$ ./openshift-install --dir <installation_directory> wait-for install-complete

where:

<installation_directory>: Specifies the path to the directory that you stored the installation files in.

Example output
INFO Waiting up to 30m0s for the cluster to initialize...

The command succeeds when the Cluster Version Operator finishes deploying the OpenShift Container Platform cluster from Kubernetes API server.

warning

The Ignition config files that the installation program generates contain certificates that expire after 24 hours, which are then renewed at that time. If the cluster is shut down before renewing the certificates and the cluster is later restarted after the 24 hours have elapsed, the cluster automatically recovers the expired certificates. The exception is that you must manually approve the pending node-bootstrapper certificate signing requests (CSRs) to recover kubelet certificates. See the documentation for Recovering from expired control plane certificates for more information.
It is recommended that you use Ignition config files within 12 hours after they are generated because the 24-hour certificate rotates from 16 to 22 hours after the cluster is installed. By using the Ignition config files within 12 hours, you can avoid installation failure if the certificate update runs during installation.

Confirm that the Kubernetes API server is communicating with the pods.

To view a list of all pods, use the following command:

$ oc get pods --all-namespaces

Example output
NAMESPACE                         NAME                                            READY   STATUS      RESTARTS   AGE
openshift-apiserver-operator      openshift-apiserver-operator-85cb746d55-zqhs8   1/1     Running     1          9m
openshift-apiserver               apiserver-67b9g                                 1/1     Running     0          3m
openshift-apiserver               apiserver-ljcmx                                 1/1     Running     0          1m
openshift-apiserver               apiserver-z25h4                                 1/1     Running     0          2m
openshift-authentication-operator authentication-operator-69d5d8bf84-vh2n8        1/1     Running     0          5m

View the logs for a pod that is listed in the output of the previous command by using the following command:
```
$ oc logs <pod_name> -n <namespace>
```
where:

<namespace>

Specifies the pod name and namespace, as shown in the output of an earlier command. If the pod logs display, the Kubernetes API server can communicate with the cluster machines.

For an installation with Fibre Channel Protocol (FCP), additional steps are required to enable multipathing. Do not enable multipathing during installation. See "Enabling multipathing with kernel arguments on RHCOS" in the Postinstallation machine configuration tasks documentation for more information.
Register your cluster on the Cluster registration page.

Verification

If you have enabled secure boot during the OpenShift Container Platform bootstrap process, the following verification steps are required:

Debug the node by running the following command:
```
$ oc debug node/<node_name>
```
Example output
```
chroot /host
```
Confirm that secure boot is enabled by running the following command. Example output states 1 if secure boot is enabled and 0 if secure boot is not enabled.
```
$ cat /sys/firmware/ipl/secure
```

List the re-IPL configuration by running the following command:

# lsreipl

Example output for an FCP disk
Re-IPL type: fcp
WWPN: 0x500507630400d1e3
LUN: 0x4001400e00000000
Device: 0.0.810e
bootprog: 0
br_lba: 0
Loadparm: ""
Bootparms: ""
clear: 0

Example output for a DASD disk
for DASD output:
Re-IPL type: ccw
Device: 0.0.525d
Loadparm: ""
clear: 0

Shut down the node by running the following command:
```
sudo shutdown -h
```
Initiate a boot from LPAR from the Hardware Management Console (HMC). See Initiating a secure boot from an LPAR in IBM documentation.
When the node is back, check the secure boot status again.

Additional resources

Prerequisites for installing a cluster on IBM Z in a disconnected environment​

About installations in restricted networks​

Additional limits​

Preparing the user-provisioned infrastructure​

Example load balancer configuration for user-provisioned clusters​

Manually creating the installation configuration file​

Sample install-config.yaml file for IBM Z​

Configuring the cluster-wide proxy during installation​

Configuring a three-node cluster​

Cluster Network Operator configuration​

Cluster Network Operator configuration object​

defaultNetwork object configuration​

Configuration for the OVN-Kubernetes network plugin​

Creating the Kubernetes manifest and Ignition config files​

Configuring boot volume encryption in an IBM Z or IBM LinuxONE environment​

LUKS encryption via CEX in an IBM Z or IBM LinuxONE environment​

Configuring NBDE with static IP in an IBM Z or IBM LinuxONE environment​

Installing RHCOS and starting the OpenShift Container Platform bootstrap process​

Networking and bonding options for ISO installations​

Configuring DHCP or static IP addresses​

Configuring an IP address without a static hostname​

Specifying multiple network interfaces and DNS servers​

Configuring default gateway and route​

Configuring VLANs on individual interfaces​

Bonding multiple network interfaces to a single interface​

Using network teaming​

Waiting for the bootstrap process to complete​

Logging in to the cluster by using the CLI​

Approve the certificate signing requests for your machines​

Initial Operator configuration​

Disabling the default software catalog sources​

Image registry storage configuration​

Configure registry storage for IBM Z​

Configure storage for the image registry in non-production clusters​

Completing installation on user-provisioned infrastructure​

Prerequisites for installing a cluster on IBM Z in a disconnected environment

About installations in restricted networks

Additional limits

Preparing the user-provisioned infrastructure

Example load balancer configuration for user-provisioned clusters

Manually creating the installation configuration file

Sample install-config.yaml file for IBM Z

Configuring the cluster-wide proxy during installation

Configuring a three-node cluster

Cluster Network Operator configuration

Cluster Network Operator configuration object

defaultNetwork object configuration

Configuration for the OVN-Kubernetes network plugin

Creating the Kubernetes manifest and Ignition config files

Configuring boot volume encryption in an IBM Z or IBM LinuxONE environment

LUKS encryption via CEX in an IBM Z or IBM LinuxONE environment

Configuring NBDE with static IP in an IBM Z or IBM LinuxONE environment

Installing RHCOS and starting the OpenShift Container Platform bootstrap process

Networking and bonding options for ISO installations

Configuring DHCP or static IP addresses

Configuring an IP address without a static hostname

Specifying multiple network interfaces and DNS servers

Configuring default gateway and route

Configuring VLANs on individual interfaces

Bonding multiple network interfaces to a single interface

Using network teaming

Waiting for the bootstrap process to complete

Logging in to the cluster by using the CLI

Approve the certificate signing requests for your machines

Initial Operator configuration

Disabling the default software catalog sources

Image registry storage configuration

Configure registry storage for IBM Z

Configure storage for the image registry in non-production clusters

Completing installation on user-provisioned infrastructure