helm/docs/examples/nginx/templates/deployment.yaml

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  # This uses a "fullname" template (see _helpers)
  # Basing names on .Release.Name means that the same chart can be installed
  # multiple times into the same namespace.
  name: {{template "fullname" .}}
  labels:
    # This is a convention. It makes it possible for an admin to query a cluster
    # using Kubectl and find out what packages are managed by Helm. Helm itself
    # does not depend on this label, though.
    heritage: helm
    # This makes it easy to search for all components of a release using kubectl.
    release: {{.Release.Name}}
    # This makes it easy to audit chart usage.
    chart: {{.Chart.Name}}-{{.Chart.Version}}
spec:
  replicas: {{default 1 .replicaCount}}
  template:
    metadata:
      labels:
        app: {{template "fullname" .}}
        release: {{.Release.Name}}
    spec:
      containers:
      - name: {{template "fullname" .}}
        # Making image configurable is not necessary. Making imageTag configurable
        # is a nice option for the user. Especially in the strange cases like
        # nginx where the base distro is determined by the tag. Using :latest
        # is frowned upon, using :stable isn't that great either.
        image: "{{default "nginx" .image}}:{{default "stable-alpine" .imageTag}}"
        imagePullPolicy: {{default "IfNotPresent" .pullPolicy}}
        ports:
        - containerPort: 80
        # This (and the volumes section below) mount the config map as a volume.
        volumeMounts:
        - mountPath: /usr/share/nginx/html
          name: wwwdata-volume
      volumes:
        - name: wwwdata-volume
          configMap:
            name: {{template "fullname" .}}