4.2. Installing the High Availability packages and agents for Azure

Procedure

1. To get the public IP address for an Azure VM, open the VM properties in the Azure Portal or enter:

   $ az vm list -g <resource_group> -d --output table

   Example:

   $ az vm list -g azrhelclirsgrp -d --output table
   
   Name    ResourceGroup           PowerState      PublicIps        Location
   ------  ----------------------  --------------  -------------    --------------
   node01  azrhelclirsgrp          VM running      192.98.152.251    southcentralus

2. Register the VM with Red Hat:

   $ sudo -i
   # subscription-manager register

3. Disable all repositories:

   # subscription-manager repos --disable= *

4. Enable the RHEL Server HA repositories:

   # subscription-manager repos --enable=rhel-10-for-x86_64-highavailability-rpms

5. Update all packages:

   # dnf update -y

6. Install the Red Hat HA Add-On packages, along with the Azure fencing agent:

   # dnf install pcs pacemaker fence-agents-azure-arm

7. The pcs and pacemaker installation created the hacluster user in the last step. Now, create a password for the hacluster and use it for all cluster nodes:

   # passwd hacluster

8. Add the high availability service to the RHEL Firewall if your system has firewalld.service:

   # firewall-cmd --permanent --add-service=high-availability
   # firewall-cmd --reload

9. Start the pcs service and enable it to start on boot.

   # systemctl start pcsd.service
   # systemctl enable pcsd.service
   
   Created symlink from /etc/systemd/system/multi-user.target.wants/pcsd.service to /usr/lib/systemd/system/pcsd.service.