#!/bin/bash

#author:  Thomas Roehm
#version: 1.1

echo "Getting worker:"
echo ""
su - kubernetes -c "kubectl get nodes"
echo ""
read -p "Please enter the name of the worker you want to update: " NODENAME
echo "Worker: \"$NODENAME\" will be patched"
echo ""
su - kubernetes -c "kubectl drain ${NODENAME} --ignore-daemonsets"
#Below version k8s <= v1.15.x run:
#kubeadm upgrade node config --kubelet-version v1.15.x
kubeadm upgrade node

#Proceed or cancel
echo ""
read -p "Do you want to wait until ${NODENAME} has been patched to finish (uncordon) the patch-process? Please enter y (wait) or n: " PROCEED
echo "You´ve entered:  \"$PROCEED\""
echo ""

if [ $PROCEED = y ]
then
        while read -s -p "Please enter \"p\" to proceed: " p && [[ -z "$p" ]] ;
        do
                echo "Please enter \"p\" to proceed"
        done
                su - kubernetes -c "kubectl uncordon ${NODENAME}"
                echo "Uncordon ${NODENAME}"
                su - kubernetes -c "kubectl get nodes -o wide"
else
        exit 1
fi