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  • When the MCO detects any of the following changes, it applies the update without draining or rebooting the node:

    • Changes to the SSH key in the spec.config.passwd.users.sshAuthorizedKeys parameter of a machine config.

    • Changes to the global pull secret or pull secret in the openshift-config namespace.

    • Automatic rotation of the /etc/kubernetes/kubelet-ca.crt certificate authority (CA) by the Kubernetes API Server Operator.

  • When the MCO detects changes to the /etc/containers/registries.conf file, such as editing an ImageDigestMirrorSet, ImageTagMirrorSet, or ImageContentSourcePolicy object, it drains the corresponding nodes, applies the changes, and uncordons the nodes. The node drain does not happen for the following changes:

    • The addition of a registry with the pull-from-mirror = "digest-only" parameter set for each mirror.

    • The addition of a mirror with the pull-from-mirror = "digest-only" parameter set in a registry.

    • The addition of items to the unqualified-search-registries list.