Deploy a microservice in Kubernetes

First we have to create the Deployment file and save it as demo-deployment.yaml

This YAML document describes a Deployment named hello with 3 replicas of a Pod named hello-app running a container with the remote image gcr.io/google-samples/hello-app:1.0.

For more information visit: https://kubernetes.io/docs/concepts/workloads/controllers/deployment/

apiVersion: apps/v1
kind: Deployment
metadata:
  name: hello
  labels:
    role: hello
spec:
  replicas: 3
  selector:
    matchLabels:
      role: hello
      tier: web
  template:
    metadata:
      labels:
        role: hello
        tier: web
    spec:
      containers:
      - name: hello-app
        image: gcr.io/google-samples/hello-app:1.0
        ports:
        - containerPort: 8080

Next, to actually create the deployment we execute the following:

kubectl apply -f demo-deployment.yaml 

To verify the status and information of the deployment use:

kubectl get deployments

To check the pods created by the service use:

kubectl get pods

You should see 3 hello-app pods (one for each replica)

Reference Links

• https://kubernetes.io/docs/concepts/workloads/controllers/deployment/