4.2. Installing the High Availability packages and agents

Procedure

1. Remove the AWS Red Hat Update Infrastructure (RHUI) client.

   # dnf -y remove rh-amazon-rhui-client

2. Register the VM with Red Hat.

   # subscription-manager register

3. Disable all repositories.

   # subscription-manager repos --disable=

4. Enable the Red Hat Enterprise Linux (RHEL) 10 Server HA repositories.

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

5. Update the RHEL AWS instance.

   # dnf update -y

6. Install the Red Hat High Availability Add-On software packages, along with the AWS fencing agent from the High Availability channel.

   # dnf install pcs pacemaker fence-agents-aws

7. The user hacluster was created during the pcs and pacemaker installation in the earlier step. Create a password for hacluster on all cluster nodes. Use the same password for all nodes.

   # passwd hacluster

8. Add the high availability service to the RHEL Firewall if firewalld.service is installed.

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

   # firewall-cmd --reload

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

   # systemctl enable --now pcsd.service

10. Edit /etc/hosts and add RHEL hostnames and internal IP addresses. See How should the /etc/hosts file be configured on RHEL cluster nodes? for details.