Nodes may be added to a cluster by running the StorageOS container with
set to the IP addresses of one of the nodes.
It is currently not possible for a node to leave the cluster completely. If the StorageOS container is stopped and/or removed from a node then the node will be detected as failed and it will be marked offline, but there is no way to remove the node from the list.
The next release will provide functionality to cleanly remove a node.
To drain the node:
storageos node drain storageos-1