enable adjusting agent replicas and ensure deployments are updated when shared secret changes (#3294)

incubator/drone/Chart.yaml

@@ -1,7 +1,7 @@
 name: drone
 home: https://drone.io/
 icon: http://docs.drone.io/logo.svg
-version: 0.2.1
+version: 0.3.0
 appVersion: 0.8.2
 description: Drone is a Continuous Delivery system built on container technology
 keywords:

incubator/drone/README.md

@@ -54,6 +54,7 @@ The following tables lists the configurable parameters of the drone charts and t
 | `server.env`                | Drone **server** environment variables                                                        | `(default values)`          |
 | `server.resources`          | Drone **server** pod resource requests & limits                                               | `{}`                        |
 | `agent.env`                 | Drone **agent** environment variables                                                         | `(default values)`          |
+| `agent.replicas`            | Drone **agent** replicas                                                                      | `1`                         |
 | `agent.resources`           | Drone **agent** pod resource requests & limits                                                | `{}`                        |
 | `dind.driver`               | **DinD** storage driver                                                                       | `overlay2`                  |
 | `dind.resources`            | **DinD** pod resource requests & limits                                                       | `{}`                        |
@@ -62,4 +63,4 @@ The following tables lists the configurable parameters of the drone charts and t
 | `persistence.storageClass`  | Storage class of backing PVC                                                                  | `nil`                       |
 | `persistence.accessMode`    | Use volume as ReadOnly or ReadWrite                                                           | `ReadWriteOnce`             |
 | `persistence.size`          | Size of data volume                                                                           | `1Gi`                       |
-| `sharedSecret`              | Drone server and agent shared secret                                                          | `(random value)`            |
+| `sharedSecret`              | Drone server and agent shared secret (Note: The Default random value changes on every `helm upgrade` causing a rolling update of server and agents) | `(random value)`            |

incubator/drone/templates/deployment-agent.yaml

@@ -9,9 +9,11 @@ metadata:
     heritage: "{{ .Release.Service }}"
     component: agent
 spec:
-  replicas: 1
+  replicas: {{ .Values.agent.replicas }}
   template:
     metadata:
+      annotations:
+        checksum/secrets: {{ include (print $.Template.BasePath "/secrets.yaml") . | sha256sum }}
       labels:
         app: {{ template "drone.name" . }}
         release: "{{ .Release.Name }}"

incubator/drone/templates/deployment-server.yaml

@@ -13,6 +13,8 @@ spec:
   replicas: 1
   template:
     metadata:
+      annotations:
+        checksum/secrets: {{ include (print $.Template.BasePath "/secrets.yaml") . | sha256sum }}
       labels:
         app: {{ template "drone.name" . }}
         release: "{{ .Release.Name }}"

incubator/drone/values.yaml

@@ -105,6 +105,9 @@ agent:
   env:
     DRONE_DEBUG: "false"
 
+  ## Number of drone agent replicas
+  replicas: 1
+
   ## CPU and memory limits for drone agent
   ##
   resources: {}