Getting MountVolume.SetUp failed for volume while installing stable RabbitMQ in Kubernetes
This works fine for me. Looks like it's an issue related to this in this case it can't mount the ConfigMap volume where the rabbitmq config is: the config-volume. It may also be the case that something is preventing mounting volumes on your nodes (process, file descriptor, etc).
You didn't specify where you are running this, but you can try bouncing your node components: kubelet, docker, and ultimately your node. Keep in mind that all other containers running on the node will restart somewhere again in the cluster.
Edit:
There was a mismatch between kubectl client, kubectl version and kubeadm version.