build-push.sh.example

#!/usr/bin/env bash
set -euo pipefail

# =============================================================================
# Build, push, and deploy a service to Kubernetes
#
# Usage:
#   1. Copy this file into the service directory you want to deploy:
#      cp build-push.sh.example rest/build-push.sh
#
#   2. Update the configuration variables below for your environment.
#
#   3. Run from the service directory:
#      cd rest && ./build-push.sh
# =============================================================================

# Configuration — update these for your environment
REGISTRY="<your-docker-registry>"          # e.g. europe-north1-docker.pkg.dev/my-project/my-repo
IMAGE_NAME="<service-name>"                # e.g. rest-backend, provision-log-queue-consumer
KUBE_CONTEXT="<your-kubectl-context>"      # e.g. my-cluster-prod
DEPLOYMENT_NAME="<k8s-deployment-name>"    # e.g. rest-backend-deployment
DEPLOYMENT_YAML="<deployment-yaml-file>"   # e.g. rest-backend-deployment.yaml

# Generate version tag (git commit SHA + timestamp)
GIT_SHA=$(git rev-parse --short HEAD)
TIMESTAMP=$(date +%Y%m%d-%H%M%S)
VERSION_TAG="${GIT_SHA}-${TIMESTAMP}"

# Image tags
IMAGE_VERSIONED="${REGISTRY}/${IMAGE_NAME}:${VERSION_TAG}"
IMAGE_LATEST="${REGISTRY}/${IMAGE_NAME}:latest"

echo "Building version: ${VERSION_TAG}"

# Build with both tags
docker build \
  -t "${IMAGE_VERSIONED}" \
  -t "${IMAGE_LATEST}" \
  .

# Push both tags
echo "Pushing images..."
docker push "${IMAGE_VERSIONED}"
docker push "${IMAGE_LATEST}"

# Switch kubectl context
kubectl config use-context "${KUBE_CONTEXT}"

# Apply the deployment configuration
cd ../gcp/gke || exit 1
echo "Deploying version ${VERSION_TAG}..."
kubectl apply -f "${DEPLOYMENT_YAML}"

# Update the image to the specific version (triggers rolling update)
kubectl set image deployment/${DEPLOYMENT_NAME} \
  ${DEPLOYMENT_NAME}="${IMAGE_VERSIONED}"

# Wait for rollout to complete
echo "Waiting for rollout to complete..."
kubectl rollout status deployment/${DEPLOYMENT_NAME} --timeout=5m

if [ $? -eq 0 ]; then
  echo "Deployment successful! Version: ${VERSION_TAG}"
  kubectl get deployment ${DEPLOYMENT_NAME}
  echo "To rollback: kubectl rollout undo deployment/${DEPLOYMENT_NAME}"
else
  echo "Deployment failed. Rolling back..."
  kubectl rollout undo deployment/${DEPLOYMENT_NAME}
  exit 1
fi