[stable/redis] add persistence.existingClaim (#717)

* add persistence.existingClaim to redis

* missed the version

* cleanup templating

stable/redis/Chart.yaml

@@ -1,5 +1,5 @@
 name: redis
-version: 0.4.6
+version: 0.5.0
 description: Open source, advanced key-value store. It is often referred to as a data structure server since keys can contain strings, hashes, lists, sets and sorted sets.
 keywords:
 - redis

stable/redis/README.md

@@ -49,6 +49,7 @@ The following tables lists the configurable parameters of the Redis chart and th
 | `imagePullPolicy`          | Image pull policy                   | `IfNotPresent`                                            |
 | `redisPassword`            | Redis password                      | Randomly generated                                        |
 | `persistence.enabled`      | Use a PVC to persist data           | `true`                                                    |
+| `persistence.existingClaim`| Use an existing PVC to persist data | `nil`                                                     |
 | `persistence.storageClass` | Storage class of backing PVC        | `generic`                                                 |
 | `persistence.accessMode`   | Use volume as ReadOnly or ReadWrite | `ReadWriteOnce`                                           |
 | `persistence.size`         | Size of data volume                 | `8Gi`                                                     |
@@ -78,4 +79,14 @@ $ helm install --name my-release -f values.yaml stable/redis
 
 The [Bitnami Redis](https://github.com/bitnami/bitnami-docker-redis) image stores the Redis data and configurations at the `/bitnami/redis` path of the container.
 
-The chart mounts a [Persistent Volume](kubernetes.io/docs/user-guide/persistent-volumes/) volume at this location. The volume is created using dynamic volume provisioning.
+By default, the chart mounts a [Persistent Volume](kubernetes.io/docs/user-guide/persistent-volumes/) volume at this location. The volume is created using dynamic volume provisioning. If a Persistent Volume Claim already exists, specify it during installation.
+
+### Existing PersistentVolumeClaim
+
+1. Create the PersistentVolume
+1. Create the PersistentVolumeClaim
+1. Install the chart
+```bash
+$ helm install --set persistence.existingClaim=PVC_NAME redis
+```
+

stable/redis/templates/deployment.yaml

@@ -49,7 +49,7 @@ spec:
       - name: redis-data
       {{- if .Values.persistence.enabled }}
         persistentVolumeClaim:
-          claimName: {{ template "fullname" . }}
+          claimName: {{ .Values.persistence.existingClaim | default (include "fullname" .) }}
       {{- else }}
         emptyDir: {}
       {{- end -}}

stable/redis/templates/pvc.yaml

@@ -1,4 +1,4 @@
-{{- if .Values.persistence.enabled }}
+{{- if and .Values.persistence.enabled (not .Values.persistence.existingClaim) }}
 kind: PersistentVolumeClaim
 apiVersion: v1
 metadata:

stable/redis/values.yaml

@@ -19,6 +19,12 @@ imagePullPolicy: IfNotPresent
 ##
 persistence:
   enabled: true
+
+  ## A manually managed Persistent Volume and Claim
+  ## Requires persistence.enabled: true
+  ## If defined, PVC must be created manually before volume will be bound
+  # existingClaim:
+
   ## If defined, volume.beta.kubernetes.io/storage-class: <storageClass>
   ## Default: volume.alpha.kubernetes.io/storage-class: default
   ##