1.4. Installing Red Hat High Availability Add-On software

To install Red Hat High Availability Add-On software, you must have entitlements for the software. If you are using the luci configuration GUI, you can let it install the cluster software. If you are using other tools to configure the cluster, secure and install the software as you would with Red Hat Enterprise Linux software.
You can use the following yum install command to install the Red Hat High Availability Add-On software packages:
# yum install rgmanager lvm2-cluster gfs2-utils
Note that installing only the rgmanager will pull in all necessary dependencies to create an HA cluster from the HighAvailability channel. The lvm2-cluster and gfs2-utils packages are part of ResilientStorage channel and may not be needed by your site.

Warning

After you install the Red Hat High Availability Add-On packages, you should ensure that your software update preferences are set so that nothing is installed automatically. Installation on a running cluster can cause unexpected behaviors.

Upgrading Red Hat High Availability Add-On Software

It is possible to upgrade the cluster software on a given major release of Red Hat Enterprise Linux without taking the cluster out of production. Doing so requires disabling the cluster software on one host at a time, upgrading the software, and restarting the cluster software on that host.
  1. Shut down all cluster services on a single cluster node. For instructions on stopping cluster software on a node, see Section 9.1.2, “Stopping Cluster Software”. It may be desirable to manually relocate cluster-managed services and virtual machines off of the host prior to stopping rgmanager.
  2. Execute the yum update command to update installed packages.
  3. Reboot the cluster node or restart the cluster services manually. For instructions on starting cluster software on a node, see Section 9.1.1, “Starting Cluster Software”.