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Kubelet would be part of the kubernetes distro (vanilla, RKE2, K3S, etc) you installed, so restarting that service on the host OS would be the way to get kubelet back.

This was a docker container named

kubelet

running on the worker node. I had found instructions to start it using systemctl but:

# systemctl start kubelet
Failed to start kubelet.service: Unit kubelet.service not found.

You should look at how Kubernetes was installed and go to their docs. Kubernetes has been discouraging Docker for a while, so you've either got something very old or one of the odd Kubernetes distros like RKE1 that still use it.

Yes, it's RKE1, setup through rancher.

Then I'd look at the RKE1 docs for how to restart RKE on the system. I think it's something like

rke down

to stop it and

rke up

to start but I've never used it myself so you should check docs. If you'd done it with RKE2 it'd be

systemctl restart rke2-server

but that's irrelevant with RKE1.

Thanks I'll look into that.