Any OpenShift Container Platform 4 cluster can be upgraded using the web console or the OpenShift CLI. In this blog we review the tools we have at our disposal to plan OpenShift cluster updates. This blog can be used as reference for all the tools available to help you keep your clusters updated in the maintenance window, with latest security fixes and minimal disruption to workloads.
Types of OCP clusters
OpenShift clusters come in different flavors. The update experience differs based on the type of installation. For Self-Managed OpenShift, there can be a Connected and Disconnected Cluster. And Red Hat also provides Fully Managed OpenShift clusters on AWS, Azure, GCP and IBM cloud.
Tools and Resources
Red Hat provides a number of tools and resources to help plan updates, from long-term strategy to low-latency insights. The tools and resources listed below are useful for admins managing OpenShift updates.
Red Hat OpenShift Container Platform Life Cycle Policy
Red Hat provides a published product life cycle for customers to plan, deploy and support their infrastructure. Customers can track which OCP versions are Fully supported, Maintenance Supported and Extended Update Supported and also know the life cycle dates.
Red Hat Product Errata
Red Hat Errata helps customers determine the latest Bug Fix, Enhancement and Security Advisories for OCP versions. Each OCP release is available as soon as errata is released for the version. There is also an application on Customer Portal labs which retrieves information about errata advisories called the Red Hat Product errata advisory checker.
Red Hat Documentation
OCP documentation page is the most useful resource for learning about Updating clusters . Docs cover topics like channels, EUS-to-EUS upgrades, the canary rollout strategy, updating OCP clusters in restricted-network environments, etc.
Red Hat Knowledge Articles
KCS Article and Solution pages are useful to learn about solutions and workarounds for specific problems related to updates and supported but not recommended updates.
Red Hat Insights
Red Hat Insights is available for Red Hat OpenShift 4 customers as a new feature of Red Hat OpenShift Cluster Manager. Insights provides recommendations for updates which is useful for planning the next update and assisting with cluster management.
This interface allows you to plan updates from within the cluster. It exposes the update service's recommendations for your configured channel, so you can get tailored advice by configuring the update channel that aligns with your intentions. And since 4.10.14, it allows you to pause and unpause compute machine-config pools to customize your cluster updates. And since 4.10.16, it supports conditional updates.
By default, the cluster connects to an OpenShift Update Service hosted by Red Hat. But you can run the OpenShift Update Service locally to get the same experience for clusters in restricted-network environments.
OpenShift Container Platform Update Graph
This application helps visualize the recommended updates of Red Hat OCP. You can also visualize update paths by channel. This tool simplifies the planning for the shortest update path between two versions. It also provides the instructions to upgrade the cluster using CLI and Web Console.
Red Hat OpenShift, the most popular container orchestration platform, has always been about flexibility, scalability, and resilience. As workloads evolve, so do the requirements for resources such as ...