Procedure to upgrade a RHEL 8 High Availability cluster to RHEL 9

Introduction

This document will describe how to do a rolling upgrade of a RHEL 8.8 High Availability cluster (or later) to RHEL 9.2 (or later). A rolling upgrade is one where each cluster node is temporarily removed from the running cluster, the operating system upgraded, and then put back into the cluster. As long as there are no constraints requiring a resource to run only on a spec...