Bash script for draining & terminating Kubernetes nodes

kube-rotate.sh

#!/usr/bin/env bash

k8s_node="$1"

kubectl drain --force --ignore-daemonsets --delete-local-data ${k8s_node}

if [[ $? -eq 0 ]]; then
  instance_id=$(aws ec2 describe-instances --out=text\
    --filters Name=network-interface.private-dns-name,Values=${k8s_node} \
    --query 'Reservations[0].Instances[0].{InstanceID:InstanceId}')

  aws ec2 terminate-instances --instance-ids ${instance_id}
fi