Chapter 3. Installing the high availability and RHOSP packages and agents

Install the packages required for configuring a Red Hat High Availability cluster on Red Hat OpenStack Platform (RHOSP). You must install the packages on each of the nodes you will use as cluster members.

Prerequisites

  • A server group for the RHOSP instances to use as HA cluster nodes, configured as described in RHOSP server group configuration for HA instances

  • An RHOSP instance for each HA cluster node

    • The instances are members of a server group
    • The instances are configured as nodes running RHEL 9.1 or later

Procedure

  1. Enable the RHEL HA repositories and the RHOSP tools channel. 

    # subscription-manager repos --enable=rhel-9-for-x86_64-highavailability-rpms
# subscription-manager repos --enable=openstack-17-tools-for-rhel-9-x86_64-rpms

  2. Install the Red Hat High Availability Add-On software packages and the packages that are required for the RHOSP cluster resource agents and the RHOSP fence agents. 

    # dnf install pcs pacemaker python3-openstackclient python3-novaclient fence-agents-openstack

  3. Installing the pcs and pacemaker packages on each node creates the user hacluster, which is the pcs administration account. Create a password for user hacluster on all cluster nodes. Using the same password for all nodes simplifies cluster administration. 

    # passwd hacluster

  4. If firewalld.service is installed, add the high-availability service to the RHEL firewall. 

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

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

    # systemctl start pcsd.service
# systemctl enable pcsd.service

  6. Verify that the pcs service is running. 

    # systemctl status pcsd.service
pcsd.service - PCS GUI and remote configuration interface
Loaded: loaded (/usr/lib/systemd/system/pcsd.service; enabled; vendor preset: disabled)
Active: active (running) since Thu 2018-03-01 14:53:28 UTC; 28min ago
Docs: man:pcsd(8)
man:pcs(8)
Main PID: 5437 (pcsd)
CGroup: /system.slice/pcsd.service
     └─5437 /usr/bin/ruby /usr/lib/pcsd/pcsd > /dev/null &
Mar 01 14:53:27 ip-10-0-0-48.ec2.internal systemd[1]: Starting PCS GUI and remote configuration interface…
Mar 01 14:53:28 ip-10-0-0-48.ec2.internal systemd[1]: Started PCS GUI and remote configuration interface.
  7. Edit the /etc/hosts file and add RHEL host names and internal IP addresses. For information about /etc/hosts, see the Red Hat Knowledgebase solution: How should the /etc/hosts file be set up on RHEL cluster nodes?.

Additional resources