deployment.yaml

apiVersion: apps/v1 
kind: Deployment
metadata:
  name: deployment-name # make me dynamic
  labels:
    app: echoserver
spec:
  replicas: 1    ## if I am not set, make my default 1
  selector:
    matchLabels:
      app: echoserver
  template:
    metadata:
      labels:
        app: echoserver
    spec:
      containers:
      # [start of helm-echoserver  container]
      - name: echo-server # make me required
        image: praqma/helm-echoserver:1.0 # make me dynamic
        imagePullPolicy: Always # make my default = Always
        ports:
        - containerPort: 8080
        env:
        - name: PORT
          value: 8080
        - name: CUSTOME_ENV_VAR1
          value: "env var 1'"
        - name: CUSTOME_ENV_VAR2
          value: "env var 2'"

        # ...
        # MAKE THE USER PROVIDE AS MANY ENV VARS AS THEY LIKE IN THE VALUES FILE AND READ THEM HERE

        # exposing pod info as env variables using k8s downward API for demo purposes
        # https://kubernetes.io/docs/tasks/inject-data-application/environment-variable-expose-pod-information/
        - name: POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: POD_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        - name: POD_IP
          valueFrom:
            fieldRef:
              fieldPath: status.podIP
        - name: POD_NODE_NAME
          valueFrom:
            fieldRef:
              fieldPath: spec.nodeName
        # exposing Helm info as env variables for demo purposes
        # see https://docs.helm.sh/chart_template_guide/#built-in-objects
        - name: HELM_CHART_NAME
          value: chart-name # make me dynamic
        - name: HELM_CHART_VERSION
          value: chart-version # make me dynamic
        - name: HELM_RELEASE
          value: release-name # make me dynamic        

      # [end of helm-echoserver container]