redis.yml

#@ load("@ytt:overlay", "overlay")
#@ load("@ytt:data", "data")

#@ def redis():
metadata:
  labels:
    app: redis
#@ end

#! overlay.subset() also accepts YAML fragments
#@overlay/match by=overlay.subset(redis()), expects="0+"
---
metadata:
  #@overlay/match missing_ok=True
  namespace: #@ data.values.namespace.name

#@overlay/match by=overlay.and_op(overlay.subset(redis()), overlay.subset({"metadata": {"name": "redis-leader"}})), expects="2+"
---
metadata:
  name: #@ data.values.helloApp.name + "-redis-leader"

#@overlay/match by=overlay.and_op(overlay.subset(redis()), overlay.subset({"metadata": {"name": "redis-follower"}})), expects="2+"
---
metadata:
  name: #@ data.values.helloApp.name + "-redis-follower"

#@overlay/match by=overlay.and_op(overlay.subset(redis()), overlay.subset({"metadata": {"labels": { "app": "redis", "role": "follower"}}}), overlay.subset({"kind": "Deployment"}))
---
spec:
  template:
    spec:
      containers:
        #@overlay/match by=overlay.map_key("name")
        - name: follower
          #@overlay/match missing_ok=True
          env:
            - name: GET_HOSTS_FROM
              value: env
            - name: REDIS_LEADER_SERVICE_HOST
              value: #@ data.values.helloApp.name + "-redis-leader"