OpenShift Extended Update Support (EUS)

Something I recently learned from testing the EUS to EUS process, and I like to share the steps here. Starting OpenShift Container Platform (OCP) 4.12, Red hat is adding an additional 6 months of Extended Update Support (EUS) on even-numbered OCP release for the x86_64 architecture.

We can upgrade from a EUS version to the next EUS version with only a single reboot of non-control plane hosts. There are caveats that are listed in the reference section below.

Steps to upgrade from 4.10.x to 4.12 using the EUS-to-EUS upgrade

  • Verify that all machine config pools display a status of Up to date and that no machine config pool displays a status of “UPDATING.”
  • Set your channel to eus-<4.y+2>
  • The channel is set to eus-4.12
  • Pause all worker machine pools except for the master machine pool
  • Update 4+1 only with Partial cluster update
  • Wait for the partial upgrade to complete
  • Make sure the partial update is completed
  • No reboot for workers as noted that workers are paused on the K8S v 1.23
  • Check the OCP console
  • Check the KCS ​​ Review the k8s API version update and ensure the workloads are working properly and will be using the newly updated K8S API version.
  • Execute the following command:
    oc -n openshift-config patch cm admin-acks --patch '{"data":{"ack-4.11-kube-1.25-api-removals-in-4.12":"true"}}' --type=merge
  • OCP console shows
  • Click resume all updates
  • Double-check all machine pools. If updating, please wait for it to complete.
  • Upgrade completed and now showing OCP 4.12 (K8S v1.25)


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Shanna Chan is a passionate and self driven technologist who enjoy solving problems and share knowledge with others. Strong engineering professional skilled in presales, middleware, OpenShift, Docker, Kubernetes, open source technologies, IT Strategy, DevOps, Professional Services, Java, and Platform as a Service (PaaS).

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