Rolling Update EKS Worker Nodes

README.md

Pre usage

export AWS_PROFILE=xxx
export AWS_REGION=xxx
export KUBECONFIG=xxx
kubectl config use-context xxx 

Usage

eks-workers-rolling-update.sh

eks-workers-rolling-update.sh

#!/bin/bash

echo "kubectl must be installed"
echo "aws cli must be installed"
## @envvars
echo AWS_PROFILE or other AWS credentials env vars must be populated
echo AWS_REGION .. hope you already populated
echo KUBECONFIG env var is exposed
## TODO read k config current-context .. validate with user if he is sure
function drain() {
   node_name=$1
   kubectl drain ${node_name} --ignore-daemonsets --force --delete-local-data &
   sleep 120
}

function terminate() {
  ec2_instance_id=$1;
  aws ec2 terminate-instances --instance-ids $ec2_instance_id &
  aws ec2 wait instance-terminated --instance-ids $ec2_instance_id
}

function run() {
  echo "TODO manage dry run here"
}
### main
kubectl get no -o go-template='{{range .items}}{{printf "%s::%s\n" .metadata.name .spec.providerID}} {{end}}' | while read ec2_instance;do
  ec2_instance_id=$(echo $ec2_instance | awk -F/ '{print $NF}');
  node_name=$(echo $ec2_instance | awk -F'::' '{print $1}')
  drain $node_name
  terminate $ec2_instance_id
  sleep 300
done