safedrain for Kubernetes

This is an wrapper script for 'Kubectl drain' that safely evicts the pods to prevent outages

Problem:

Annoyingly the 'kubectl drain' command first terminates pods on the nodes before they are started up on alternative node. This is especially problematic where you have single pod applications and you want to do node maintenance with interuptions to the pod.

Solution:

This script checks what pods are running on your Node and calls 'kubectl rollout' to redeploy any Deployments or Statefulsets in a safe manner. The new pods are created in a 'running' state on a alternate node before the old pods are terminated. After all the pods have been moved off the node it can be safely drained.