Building Enterprise JavaScript Applications

Creating a Deployment

Since our backend API is a stateless application, we don't need to deploy a StatefulSet like we did with Elasticsearch. We can simply use a simpler Kubernetes Object that we've encountered already—Deployment.

Create a new manifest at manifests/backend/deployment.yaml with the following content:

apiVersion: apps/v1kind: Deploymentmetadata:  name: backend  labels:    app: backendspec:  selector:    matchLabels:      app: backend  replicas: 3  template:    metadata:      labels:        app: backend    spec:      containers:      - name: backend        image: d4nyll/hobnob:0.1.0        ports:        - containerPort: 8080          name: api        - containerPort: 8100          name: docs        env:        - name: ELASTICSEARCH_HOSTNAME          value: "http://elasticsearch"        - name: ELASTICSEARCH_PORT          value: "9200"        ...

For the .spec.template.spec.containers[].env ...