RegisterPlugin error -- failed to get plugin info using RPC GetInfo at socket /var/lib/kubelet/plugins/ember-csi.io/csi.sock, err: rpc error: code = Unimplemented desc = Method not found!

[csallen1204]

RegisterPlugin error -- failed to get plugin info using RPC GetInfo at socket /var/lib/kubelet/plugins/ember-csi.io/csi.sock, err: rpc error: code = Unimplemented desc = Method not found!

[Akrog]

Kubernetes 1.15 introduced a change in the plugin-manager that keeps retrying till all the plugins (socket files under /var/lib/kubelet/{plugins,plugin_registry}) registrations succeed. That didn't use to be the case in previous releases, where we would only see the error once.

We need to change the location of the CSI socket used for communication between the CSI plugin and its sidecars.

In our examples the volume in the manifest is called socket-dir, and for the Controllers they are fine, because we use an emptyDir, but not so for the nodes, were we use a directory under /var/lib/kubelet/plugins/rbd.ember-csi.io or /var/lib/kubelet/plugins/ember-csi.io.

I believe changing the nodes manifest to this should fix the issue:

      volumes:
      - name: socket-dir
        emptyDir:

Or we can create the sockets under /var/lib/kubelet/rbd.ember-csi.io and /var/lib/kubelet/ember-csi.io.

We would need to update our examples as well as the operator.