Way to install kubelet plugins?

[fasaxc]

What I'd like:

I'm trying to get Calico to install onto an EKS Bottlerocket system. By default, Calico tries to install a flexvol driver by mounting /usr/libexec/kubernetes in from the host and dropping the binary in there. However, on Bottlerocket systems, that directory is read-only. I was wondering if the path is different on Bottlerocket or if kubelet plugins simply are not supported.

Any alternatives you've considered:

• Add workarounds to our docs "remove this part of the YAML"; not a great UX.
• Provide yet-another axis of manifests; so the user has to select "calico-with-vxlan-for-bottlerocket.yaml". Again, this gives a poor UX where the user has to make lots of decisions.
• Replace our flexvol driver with something else, maybe installing a CSI driver is supported?
• Don't support bottlerocket.

[bcressey]

CSI drivers would be supported.

I'll check whether it will be sufficient to add a compatibility symlink from /usr/libexec/kubernetes/kubelet-plugins to /var/lib/kubelet/plugins, which is where our kubelet is configured to look.