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Thank you. And these customization files need to be on 1 of the master-nodes, or on all of them?

there are additional docs on that in https://docs.k3s.io/installation/packaged-components

If you have multiple server nodes, and place additional AddOn manifests on more than one server, it is your responsibility to ensure that files stay in sync across those nodes. K3s does not sync AddOn content between nodes, and cannot guarantee correct behavior if different servers attempt to deploy conflicting manifests.

The documentation doesn't say whether we're required to put the file on all server-nodes if we have multiple of them, just that they need to be in sync if we do that. So: do we have to put these customizations on all server nodes, or would it be enough if they were all just on one? The documentation isn't really clear on that, but my guess is one is enough?

If you decide to put them on multiple nodes, its up to you to keep them in sync.

Okay. Just tried and it works even on 1 server only. I guess that's the best way to go. Didn't want to sound negative, just want to make sure I'm not screwing up the production cluster. But yeah… works like a charm. Thanks again!