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

Procedure

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

   # subscription-manager repos --enable=rhel-8-for-x86_64-highavailability-rpms
   # subscription-manager repos --enable=openstack-16-tools-for-rhel-8-x86_64-rpms

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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.

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

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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

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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

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

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

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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.

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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?.