Tech used:

• Node.js

• Docker

• Kubernetes

• GKE(Google Kubernetes Engine)

• GCR(Google Container Registry)

Steps

• Create kubernetes cluster on GKE.

• Setup Connection to created GKE cluster in with your local machine or cloud shell.

    gcloud container clusters get-credentials <CLUSTER_NAME> --zone <ZONE> --project <PROJECT_ID>
  

• Create a simple nodejs/express application.

• Write Dockerfile for the application

    FROM --platform=linux/amd64 node:14
    WORKDIR /usr/app
    COPY package.json .
    RUN npm install
    COPY . .
    EXPOSE 80
    CMD ["node","app.js"]
  

• Build the Docker image

    docker build -t us.gcr.io/<PROJECT_ID>/imagename:tag .
  

• Push docker image to GCR(Google Container Registry)

    docker push us.gcr.io/<PROJECT_ID>/imagename:tag
  

• Test the application using docker.

    docker run -d -p 3000:80 us.gcr.io/<PROJECT_ID>/imagename:tag
  

• Write kubernetes manifest file for deployment. deploy.yml

    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name:  nodeappdeployment
      labels:
        type: backend
        app: nodeapp
    spec:
      replicas: 1
      selector:
        matchLabels:
          type: backend
          app: nodeapp
      template:
        metadata:
          name: nodeapppod
          labels:
            type: backend
            app: nodeapp
        spec:
          containers:
            - name: nodecontainer
              image: us.gcr.io/<PROJECT_ID>/imagename:tag
              ports:
                - containerPort: 80
  

• Write kubernetes manifest file for service. service.yml

    kind: Service
    apiVersion: v1
    metadata:
      name: nodeapp-load-service
    spec:
      ports:
        - port: 80 
          targetPort: 80
      selector:
        type: backend
        app: nodeapp  
      type: LoadBalancer
  

• Apply manifest file to create deployment.

    kubectl apply -f deploy.yml
  

• Check status of the deployment.

    kubectl get deploy
  

• Apply manifest file to create load balancer service.

    kubectl apply -f service.yml
  

• Check status of service.

    kubectl get svc
  

• Check the external IP of the service in the browser.