k8s_deployment_with_service_comments.yaml

apiVersion: apps/v1               # Deployments get an "apps/v1" - no longer in beta.
kind: Deployment                  # kind is for the type of resource.
metadata:                         # metadata provides information about the resource.
  name: my-deployment             # We name our Deployment my-deployment. 
                                  #This is the value at metadata.name.
spec:                             
  replicas: 3                     # Specify we want 3 Pods in our ReplicaSet.
  selector:                        
    matchLabels:                  # spec.selector.matchLabels tells the Deployment  
      app: my-app                 # to match Pods with a key - value label pair
                                  # equal to app - my-app.
      
  template:                       # The template section specifies info for the Pods.
    metadata:                      
      labels:                      
        app: my-app               # spec.template.metadata.labels.app 
                                  # my-app is the label for the Pods.
    spec:
      containers:                 # Info about the containers the Pods will run.
                                  
                                  # Make a name for containers. 
      - name: my-container        # Must be a list item.
      
                                  # The image will be found at this location. 
                                  # Must be a map.
        image: gcr.io/hello-minikube-zero-install/hello-node  
                                  
---                               
                                  # Multiple resources need --- between them.
apiVersion: v1                    # Note, no "apps/" for Services.
kind: Service                     # The type of resource is a Service.
metadata:
  name: my-service                # Making up a name for the Service
spec:
  selector:                       # Tell the Service the group of Pods to use.
    app: my-app                   # The Service will attach to Pods with the 
                                  # key - value pair app - my-app.
  ports:                          # The external port number for the Service.
                                  # Your app will run on to localhost:8080.
  - port: 8080                    # Must be a list item.
                                  # The type of Service to create.
  type: LoadBalancer              # Must be a map.