Deploy our Sample Applications 

apiVersion: apps/v1
kind: Deployment
metadata:
  name: ecsdemo-nodejs
  labels:
    app: ecsdemo-nodejs
  namespace: default
spec:
  replicas: 1
  selector:
    matchLabels:
      app: ecsdemo-nodejs
  strategy:
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: ecsdemo-nodejs
    spec:
      containers:
      - image: brentley/ecsdemo-nodejs:latest
        imagePullPolicy: Always
        name: ecsdemo-nodejs
        ports:
        - containerPort: 3000
          protocol: TCP

In the sample file above, we describe the service and how it should be deployed. We will write this description to the kubernetes api using kubectl, and kubernetes will ensure our preferences are met as the application is deployed.

The containers listen on port 3000, and native service discovery will be used to locate the running containers and communicate with them.