GKE node pool upgrades

gke-nodepool-upgrade.sh

#!/usr/bin/env bash

PROJECT=""
LOCATION="us-east4"
CLUSTER=""
CONTEXT=""
FILTER="version:1.25.10-gke.1400"

NODEPOOLS=$(gcloud container node-pools list --cluster=$CLUSTER --project=$PROJECT --region=$LOCATION --filter="$FILTER" --format=json | jq -r ".[].name")

gcloud config set project $PROJECT
kubectl config set-context $CONTEXT

for NODEPOOL in $NODEPOOLS; do
  echo "Processing ${NODEPOOL}..."

  # Cordon
  for node in $(kubectl get nodes -l cloud.google.com/gke-nodepool=$NODEPOOL -o=name); do
    echo "Cordoning ${node}"
    kubectl cordon "$node";
  done

  # Disable autoscaling
  echo "Disabling autoscaling for ${NODEPOOL}"
  gcloud container clusters update $CLUSTER \
      --no-enable-autoscaling \
      --node-pool=$NODEPOOL \
      --region=$LOCATION

  # Drain
  for node in $(kubectl get nodes -l cloud.google.com/gke-nodepool=$NODEPOOL -o=name); do
    echo "Draining ${node}"
    kubectl drain --force --ignore-daemonsets --delete-emptydir-data --grace-period=10 "$node";
  done
done