Replace EKS nodes

replace-eks-nodes.sh

#!/bin/bash

region=$(kubectl get nodes -o jsonpath="{.items[0].metadata.labels['topology\.kubernetes\.io/region']}")
nodes=$(kubectl get nodes -o jsonpath="{.items[*].metadata.name}")

for node in ${nodes[@]}; do
  ec2_instance_id=$(kubectl get nodes -o jsonpath="{.items[0].spec.providerID}" | cut -d "/" -f 5)
  echo "[INFO] Starting node '${node}' with instance ID '${ec2_instance_id}' in the '${region}' region"

  echo "[INFO] Draining node '${node}'"
  kubectl drain --ignore-daemonsets --delete-emptydir-data "${node}"
  sleep 30

  echo "[INFO] Deleting node '${node}'"
  kubectl delete node "${node}"
  sleep 30

  echo "[INFO] Terminating EC2 instance '${ec2_instance_id}' in the '${region}' region"
  aws ec2 terminate-instances --instance-id "${ec2_instance_id}" --region "${region}"
  sleep 30
done