Red Hat Summit1.3.2. Cluster update options
The process for updating your cluster is based on the updates that are available for your current version, and what level of release you are interested in, such as z-stream or y-stream updates.
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Patch (z-stream) updates: You do not need to change the channel when performing a patch update within your current minor version. For example, if you have your cluster at version 4.19.12, you can stay within your current
stable-4.19channel, and decide to update your cluster when there are updates available, such as 4.19.13, 4.19.14, 4.19.17, 4.19.20 until you have the latest updates for that minor version. Minor version (y-stream) updates: To update to a new minor release, you must change the channel to the next release channel.
For example, if you have your cluster at version 4.19.12, you can switch the channel to
stable-4.20orstable-4.21and check if there is an update path available for those versions.If
stable-4.20has an update path available, it shows you the z-stream updates for your current version, as well as the updates to the y+1 version, such as 4.19.14, 4.19.17, 4.19.20, 4.19.23, 4.19.27, 4.20.0.If you select
stable-4.21, the available updates might be 4.19.14, 4.19.17, 4.19.20, 4.19.23, 4.19.27, 4.20.0, 4.20.3, 4.20.4, 4.20.6, 4.20.7, with all the z-stream/patch updates displayed right through to the y+2 version of 4.21.0.
When you have set the channel and an update is initiated, the Cluster Version Operator (CVO) retrieves the target release image and begins applying the changes to the cluster.
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