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It does not seem to be possible to change the CNI after the cluster has been installed: https://github.com/rancher/rke/issues/2860 Not sure if I can do it manually somehow still like for example deleting the Weave pods and the Daemonsets.

I have made the observation that setting

plugin: none

in RKE does not uninstall the plugin. But you can use a migration tool or uninstall it manually and RKE will not manage the network plugin any more

in general it is a bad idea to change the CNI after the cluster is up. I would recommend against it unless you either like fixing broken things, or know what you’re doing.