Script to shutdown OpenShift

shutdown-openshift.sh

#!/bin/bash

echo "Start the cluster before this date"
oc -n openshift-kube-apiserver-operator get secret kube-apiserver-to-kubelet-signer -o jsonpath='{.metadata.annotations.auth\.openshift\.io/certificate-not-after}'
echo ""

echo "Marking nodes as unscheduable"
for node in $(oc get nodes -o jsonpath='{.items[*].metadata.name}'); do
  echo ${node}
  oc adm cordon ${node}
  # oc adm uncordon ${node} is the opposite command to run after boot and control plane is back up
done

echo "Evacuating pods"
for node in $(oc get nodes -l node-role.kubernetes.io/worker -o jsonpath='{.items[*].metadata.name}'); do
  echo ${node}
  oc adm drain ${node} --delete-emptydir-data --ignore-daemonsets=true --timeout=15s --force
done

echo "Shutting down nodes"
for node in $(oc get nodes -o jsonpath='{.items[*].metadata.name}'); do
  oc debug node/${node} -- chroot /host shutdown -h 1
done


# References
# Shutting down: https://docs.redhat.com/en/documentation/openshift_container_platform/4.20/html/backup_and_restore/graceful-shutdown-cluster
# Starting up: https://docs.redhat.com/en/documentation/openshift_container_platform/4.20/html/backup_and_restore/graceful-restart-cluster