deployment-template.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: backend-deployment-name # DEPLOYMENT_NAME
  labels:
    # we pass selector, to easy list specific Deployments:
    # kubectl get deployment --selector=KEY_DEPLOYMENT_SELECTOR
    application: backend # KEY_DEPLOYMENT_SELECTOR: VALUE_DEPLOYMENT_SELECTOR
    resource: deployment
spec:
  replicas: 3 # NUMBER_OF_REPLICAS (number of Pods)
  selector:
    matchLabels:
      # thanks to this selector, we specify, which Pods belong to this Deployment
      application: backend # KEY_POD_SELECTOR: VALUE_POD_SELECTOR 
  template: # here the Pod specification starts (look at the example-pod.yaml) 
    metadata:
      labels:
        # all Pods will get this label
        # so Deployment will easily find all his Pods
        application: backend # KEY_POD_SELECTOR: VALUE_POD_SELECTOR 
    spec:
      containers:
      - name: main-container # CONTAINER_NAME
        image: my-backend # IMAGE_NAME
        tag: v1 # TAG
        ports:
        - containerPort: 8080 # CONTAINER_PORT_NUMBER