Installing OpenShift Virtualization on IBM Cloud bare-metal nodes

Install OpenShift Virtualization on IBM Cloud bare-metal nodes using Assisted Installer. The cluster has 6 bare-metal nodes (3 control and 3 compute). An additional virtual machine is required for bootstrapping and to act as a Samba server, DHCP server, network gateway, and load balancer.

Prerequisites

An account in IBM Cloud with permissions to order and operate bare-metal nodes.
An IBM Cloud SSL VPN user, to access the SuperMicro IPMI interface of a node.
Install the OpenShift CLI (oc).

Configuring IBM Cloud for the new cluster

Configure and provision the IBM Cloud environment to establish the operational framework and nodes for your OpenShift Virtualization cluster.

Procedure

Create a new virtual server instance in IBM Cloud at Virtual Server for Classic to be the Bastion server. This instance is used to run the installation and provide environment services.
Change the default properties of the new virtual server instance to the following values. Use the provided defaults for all other values.
- Type of virtual server: Public
- Operating system: CentOS
- Your public SSH RSA key
Note the private VLAN and subnet the virtual server instance is assigned to at VLANs.
Provision 6 bare-metal nodes in IBM Cloud at Bare metal server provision. Use the following values when provisioning the nodes:
- Domain: A subdomain you can add records to.
- Quantity: 6
- Location: The same location as the virtual server instance.
- Storage disks: RAID 1
- Network Interface: Private
- Private VLAN: The same as noted for the virtual server instance.
Confirm all nodes are provisioned and ready at Device list.
Rename the control plane nodes to control0-<domain-name>, control1-<domain-name>, and control2-<domain-name>. Replace <domain-name> with the domain used when provisioning the nodes.
Rename the compute nodes to compute0-<domain-name>, compute1-<domain-name>, and compute2-<domain-name>. Replace <domain-name> with the domain used when provisioning the nodes.
Configure the Bastion virtual server instance as a default network gateway.
Configure DHCP by editing /etc/dhcp/dhcpd.conf on the Bastion virtual server instance. For example:
```
# Set DNS name and DNS server's IP address or hostname
option domain-name  <dns_domain_name>;
option domain-name-servers  <dns_ip_addresses>;

# Declare DHCP Server
authoritative;

# The default DHCP lease time
default-lease-time <default_lease_value>;

# Set the maximum lease time
max-lease-time <max_lease_value>;

# Set Network address, subnet mask and gateway

subnet <subnet_ip_address> netmask <subnet_mask> {
  # Range of IP addresses to allocate
  range dynamic-bootp <dynamic_boot_lower_address> <dynamic_boot_upper_address>;
  # Provide broadcast address
  option broadcast-address <broadcast_ip_address>;
  # Set default gateway
  option routers <default_gateway_ip_address>;
```
where:

<dns_domain_name>

Specifies the default domain name for DNS clients.

<dns_ip_addresses>

Specifies a comma-separated list of DNS server IP addresses.

<default_lease_value>

Specifies the default number of seconds a client keeps an assigned address.

<max_lease_value>

Specifies the maximum number of seconds a client keeps an assigned address.

<subnet_ip_address>

Specifies the start of the subnet IP address range.

<subnet_mask>

Specifies the subnet mask of the subnet IP address range.

<broad_ip_address>

Specifies the broadcast IP address to use when to use sending a message to every device on the subnet.

<default_gateway_ip_address>

Specifies the default gateway of the subnet.
Restart DHCP on the Bastion virtual server instance:
```
$ systemctl restart dhcpd
```
Enable IP forwarding on the Bastion virtual server instance:
```
$ sysctl -w net.ipv4.ip_forward=1
```
Verify IP forwarding is enabled on the Bastion virtual server instance:
```
$ sysctl -p /etc/sysctl.conf
```
Restart the network service on the Bastion virtual server instance:
```
$ service network restart
```
Verify if firewalld is enabled on the Bastion virtual server instance:
```
$ firewall-cmd --state
```
If the firewalld service is not enabled on the Bastion virtual server instance, enable the service:
```
$ systemctl enable firewalld
```
Start the firewalld service:
```
$ systemctl start firewalld
```
Add network address translation (NAT) rules to the firewalld service:
```
$ firewall-cmd --add-masquerade --permanent
```
Restart the firewalld service:
```
$ firewall-cmd --reload
```

Initializing the new cluster configuration

Initialize the new cluster configuration using the OpenShift Virtualization Assisted Installer service and Samba on the Bastion virtual server instance.

Procedure

Log in to the Assisted Installer service.
Create a new cluster. The new cluster has the following properties:
- Cluster name: The name used to identify the cluster under the base domain.
- Base domain: The domain used to provision the bare-metal nodes.
Click Next.
Click Generate Discovery ISO.
Provide your public SSH RSA key when prompted.
Copy and save the generated wget command for the ISO file. This will be used later to connect to the cluster nodes.
Install Samba server on the Bastion virtual server instance:
```
$ dnf install samba
```
Enable Samba server on the Bastion virtual server instance:
```
$ systemctl enable smb --now
```

Configure NAT rules for the Samba server:

$ firewall-cmd --permanent --zone=FedoraWorkstation --add-service=samba
$ firewall-cmd --reload

Configure a root user password:
```
$ sudo smbpasswd -a root
```
Create a share directory:
```
$ mkdir <share_directory>
```
Replace <share_directory> with the share directory name.
Navigate to the share directory and download the Assisted Installer ISO file using the generated wget command.

Configuring cluster networking and access

Configure networking and access to allow for remote management of the cluster.

Procedure

Edit /etc/samba/smb.conf to use the following configuration:

[global]
      log level = 3
          workgroup = SAMBA
          security = user

          passdb backend = tdbsam

          printing = cups
          printcap name = cups
          load printers = yes
          cups options = raw

      server min protocol = NT1
      ntlm auth = yes

[share]
      comment = ISO Files
      path = /root/share
      browseable = yes
      public = no
      read only = no
      directory mode = 0555
      valid users = root

note

For a more detailed example of the smb.conf file, see the smb.conf.example file in the same directory.

Save the file.
Verify the new Samba configuration:
```
$ testparm
```
Restart the Samba service:
```
$ systemctl restart smb
```
Verify that the Samba service is running and active:
```
$ systemctl status smb
```
Configure SSL VPN access to IBM Cloud:
1. Perform the procedure at Getting started with IBM Cloud Virtual Private Networking in the IBM Cloud documentation.
2. Download and install the MotionPro SSL VPN client.
3. Connect to the appropriate IBM Cloud endpoint:
```
$ sudo MotionPro --host $<vpn_endpoint> --user $<vpn_username> --passwd $<vpn_password>
```
  where:
  
  <vpn_endpoint>
  
  Specifies the appropriate SSL VPN endpoint.
  
  <vpn_username>
  
  Specifies the SSL VPN user name you configured.
  
  <vpn_password>
  
  Specifies the SSL VPN password you configured.
  
  note
  Connecting to the IBM Cloud SSL VPN disconnects you from any open VPN connections.

Completing the cluster configuration

Complete the cluster configuration by installing software on the control plane and compute nodes and configuring DNS for external access.

Procedure

For each bare-metal server, perform the following tasks:
1. Access the server using the IPMI console.
  
  note
  The IP address and credentials for IPMI console access is available in the Remote management section for each server.
2. Mount the Assisted Installer ISO file with the following attributes:
  - Virtual Media: CD-ROM Image
  - Share host: The private IP address of the Bastion server.
  - Path to image: The location of the Assisted Installer ISO file.
  - User: root
  - Password: The root user password you configured.
3. Click Save and Mount.
4. Verify the ISO mounted successfully.
5. Restart the server by selecting Remote Control → Power Control → Reset Server → Perform Action.
Return to the Assisted Installer service.
Select the Install OpenShift Virtualization and Install OpenShift Data Foundation checkboxes in the Assisted Installer options.
Select a role for each host.

note
The cluster consists of 3 control plane and 3 compute nodes.
Wait for the Assisted Installer interface to indicate each node is ready.
Click Next.
Select Cluster Managed Network.
Select the API VIP and Ingress VIP checkboxes to obtain them from DHCP or leave them unchecked to enter static values.
Click Install.
For each bare-metal server, perform the following tasks:
1. Access the server using the IPMI console.
  
  note
  The IP address and credentials for IPMI console access is available in the Remote management section for each server.
2. Select Virtual Media → CD-Rom Image.
3. Click Unmount.
4. Select Remote Control → Power Control → Reset Server → Perform Action to restart the server.
Locate the Cluster Credentials section of the installation summary.
Perform the following tasks in the Cluster Credentials section:
1. Download the kubeconfig file.
2. Save the kubeadmin password.
Install haproxy on the Bastion virtual server instance.

Configure haproxy for your environment. The following is an example configuration:

#---------------------------------------------------------------------
# Example configuration for a possible web application.  See the
# full configuration options online.
#
#   https://www.haproxy.org/download/1.8/doc/configuration.txt
#
#---------------------------------------------------------------------

#---------------------------------------------------------------------
# Global settings
#---------------------------------------------------------------------
global
  # to have these messages end up in /var/log/haproxy.log you will
  # need to:
  #
  # 1) configure syslog to accept network log events.  This is done
  # by adding the '-r' option to the SYSLOGD_OPTIONS in
  # /etc/sysconfig/syslog
  #
  # 2) configure local2 events to go to the /var/log/haproxy.log
  #   file. A line like the following can be added to
  #   /etc/sysconfig/syslog
  #
  # local2.*                    /var/log/haproxy.log
  #
  log       127.0.0.1 local2

  chroot    /var/lib/haproxy
  pidfile   /var/run/haproxy.pid
  maxconn   4000
  user      haproxy
  group     haproxy
  daemon

  # turn on stats unix socket
  stats socket /var/lib/haproxy/stats

  # utilize system-wide crypto-policies
  #ssl-default-bind-ciphers PROFILE=SYSTEM
  #ssl-default-server-ciphers PROFILE=SYSTEM

#---------------------------------------------------------------------
# common defaults that all the 'listen' and 'backend' sections will
# use if not designated in their block
#---------------------------------------------------------------------
defaults
  mode                  tcp
  log                   global
  option                httplog
  option                dontlognull
  option http-server-close
  option forwardfor     except 127.0.0.0/8
  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
#---------------------------------------------------------------------
# main frontend which proxys to the backends
#---------------------------------------------------------------------

frontend api
  bind <api_ip_address>:<api_port>
  default_backend controlplaneapi

frontend apiinternal
  bind <apiinternal_ip_address>:<apiinternal_port>
  default_backend controlplaneapiinternal

frontend secure
  bind <frontend_secure_ip_address>:<frontend_secure_port>
  default_backend secure

frontend insecure
  bind <frontend_insecure_ip_address>:<frontend_insecure_port>
  default_backend insecure

#---------------------------------------------------------------------
# static backend
#---------------------------------------------------------------------

backend controlplaneapi
  balance source
  server api <controlplaneapi_ip_address>:<controlplaneapi_port> check

backend controlplaneapiinternal
  balance source
  server api <controlplaneapiinternal_ip_address>:<controlplaneapiinternal_port> check

backend secure
  balance source
  server ingress <backend_secure_ip_address>:<backend_secure_port> check

backend insecure
  balance source
  server ingress <backend_insecure_ip_address>:<backend_insecure_port> check

where:

<api_ip_address>:<api_port>: Specifies the front end IP address and port used by the Kubernetes API server.
<apiinternal_ip_address>:<apiinternal_port>: Specifies the front end IP address and port used for internal cluster management.
<frontend_secure_ip_address>:<frontend_secure_port>: Specifies the front end IP address and port used for HTTPS traffic for hosted applications.
<frontend_insecure_ip_address>:<frontend_insecure_port>: Specifies the front end IP address and port used for HTTP traffic for hosted applications.
<controlplaneapi_ip_address>:<controlplaneapi_port>: Specifies the back end IP address and port used by the Kubernetes API server.
<controlplaneapiinternal_ip_address>:<controlplaneapiinternal_port>: Specifies the back end IP address and port used for internal cluster management.
<backend_secure_ip_address>:<backend_secure_port>: Specifies the back end IP address and port used for HTTPS traffic for hosted applications.
<backend_insecure_ip_address>:<backend_insecure_port>: Specifies the back end IP address and port used for HTTP traffic for hosted applications.

note

Replace the example values with values applicable to your network configuration.

Save the haproxy configuration.
Configure two DNS Address records (A records) for the subdomain that are externally available over the Internet:
```
<bastion_public_ip_address> api.<cluster_name>.<cluster_domain>
<bastion_public_ip_address> *.apps..<cluster_name>.<cluster_domain>
```
where:

<bastion_public_ip_address>

Specifies the externally available IP address of the Bastion virtual server instance.

<cluster_name>

Specifies the name assigned to the cluster.

<cluster_domain>

Specifies the domain assigned to the cluster.

Verification

Perform the following tasks to verify cluster access using command line access:
1. Set your environment with the kubeconfig file:
```
$ export KUBECONFIG=<kubeconfig_file_path>
```
  where:
  
  <kubeconfig_file_path>
  
  Specifies the path to the downloaded kubeconfig file.
2. Check cluster node status:
```
$ oc get nodes
```
  note
  The command output should show all nodes as Ready in the STATUS column and the ROLES column should show that control plane and compute nodes are present.
3. Check the cluster version:
```
$ oc get clusterversion
```
  note
  The command output should say Condition: Available.
Perform the following tasks to verify cluster access using the web console:
1. Paste the access URL provided by Assisted Installer into your web browser.
  
  note
  By default, clusters use self-signed certificates. This may cause your browser to display a message that says Connection not private or a similar warning. You can close this warning and continue.
2. Navigate to the URL.
3. Log in to the cluster with the username kubeadmin and the kubeadmin password provided in the Cluster Credentials section.

Prerequisites​

Configuring IBM Cloud for the new cluster​

Initializing the new cluster configuration​

Configuring cluster networking and access​

Completing the cluster configuration​

Prerequisites

Configuring IBM Cloud for the new cluster

Initializing the new cluster configuration

Configuring cluster networking and access

Completing the cluster configuration