Kubernetes-101-hellogopher_v4.yml

apiVersion: apps/v1 #Which version of the Kubernetes API you're using to create this object
kind: Deployment # What kind of object you want to create [deployment, service etc]
metadata: # Data that helps uniquely identify the object, including a name string, UID, and optional namespace
  name: hellogopher
  namespace: hellogopher
spec: #  What state you desire for the object
  selector: # Define what selectors the Deployment uses to find the PODS that are related to it
    matchLabels: # matchLabels is a map of {key,value} pairs. 
      app: hellogopher
  replicas: 1 # Tells the deployment to run 1 pod 
  template: # When creating new pods, this template will be used
    metadata:
      labels: # Labels used when searching / managing deployments
        app: hellogopher
    spec:
      containers:
      - name: hellogopher # Name of the Container
        image: programmingpercy/hellogopher:5.0 # Important, to not use latest tag as it will try DOckerhub then
        imagePullPolicy: IfNotPresent # Will only pull from DockerHub if not present already in Local docker
        envFrom: # Use this to assign a whole ConfigMap
        - configMapRef:
            name: database-configs # Just specify your configmap name
        env:
        - name: DATABASE_PASSWORD
          valueFrom: 
            secretKeyRef: # This is used to fetch value from secret, should be base64 encoded
              name: database-secrets # Name of our secrets object
              key: DATABASE_PASSWORD # The secret key to fetch value from
        ports: # Ports to Expose
        - containerPort: 8080
        readinessProbe:
          initialDelaySeconds: 5 # Time before starting to Probe status
          timeoutSeconds: 1 # Time to wait before timeout
          # HTTP probe
          httpGet:
            path: / # the path we use to probe
            port: 8080
        livenessProbe:
          initialDelaySeconds: 5 # Time before starting to Probe status
          timeoutSeconds: 1 # Time to wait before timeout
          failureThreshold: 3 # How many times it can fail before restarting
          # HTTP probe
          httpGet:
            path: / # the path we use to probe
            port: 8080