OpenShift Upgrade Deep Dive: 4.19 4.20 (Step-by-Step + What Happens Under the Hood)

Upgrading Red Hat OpenShift isn’t just about running oc adm upgrade. Behind the scenes, a carefully orchestrated process ensures your cluster stays available while everything gets updated. In this guide, I’ll walk through: Real Upgrade path 4.19 to 4.20 Handling AdminAckRequired blockers Setting upgrade channels properly Understanding how OpenShift upgrades nodes (masters + workers) Why Pod Disruption Budgets (PDBs) can make or break your upgrade Pre-Upgrade : Check that none of the operators ar