From 

On several occasions, we've had nodes that just won't reboot (e.g., corrupt disk image). There are two approaches to resolving this problem:

Option 1: re-run ansible

• Shutdown nodes, rename to node-dead or delete. 
• Detach volumes, but do not remove
• Re-run ansible openstack-provision and k8s-install

Option 2: 

• Shutdown nodes, rename to node-dead or delete. 
• In OpenStack, make a snapshot of a good node (similar type)
• Create new instance from snapshot
• Change instance name
• Edit /etc/kubelet/kubelet.config, change name to correct name 
• Re-attach volumes