Deploying a Simple Node.js Application on Kubernetes

We will deploy a basic Node.js application on a Kubernetes cluster using the KodeKloud engineer platform.

Create a Nodeapp Deployment

We will use the imperative approach and save it to a file.

kubectl create deployment nodeapp  --replica=2  \
--image=gcr.io/kodekloud/centos-ssh-enabled:node \ 
--port 8080 --dry-run=client -o yaml > nodeapp-deployment.yaml        

Final deployment object

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: nodeapp
  name: nodeapp
spec:
  replicas: 2
  selector:
    matchLabels:
      app: nodeapp
  strategy: {}
  template:
    metadata:
      labels:
        app: nodeapp
    spec:
      containers:
      - image: gcr.io/kodekloud/centos-ssh-enabled:node
        name: centos-ssh-enabled
        ports:
        - containerPort: 8080        

selector: Labels to identify pods managed by our deployment. labels: Labels for the pod template (app: nodeapp).

Create a Nodeapp nodeport Service

We will use the imperative approach, and then save it to a manifest file for some changes.

kubectl create service nodeport  nodeapp   --tcp 8080:8080 \
--dry-run=client -o yaml > nodeapp-service.yaml        

Final service object

apiVersion: v1
kind: Service
metadata:
  labels:
    app: nodeapp
  name: nodeservice
spec:
  ports:
  - port: 8080
    protocol: TCP
    targetPort: 8080
    nodePort: 30012
  selector:
    app: nodeapp
  type: NodePort        

selector: Labels to select pods for exposing the service. Here, pods with the label app: nodeapp will be included

https://engineer.kodekloud.com/