Add mariadb persistence (#97)

stable/mariadb/Chart.yaml

@@ -1,5 +1,5 @@
 name: mariadb
-version: 0.3.1
+version: 0.4.0
 description: Chart for MariaDB
 keywords:
 - mariadb

stable/mariadb/README.md

@@ -60,6 +60,10 @@ The following tables lists the configurable parameters of the MariaDB chart and
 | `mariadbUser`           | Username of new user to create.    | `nil`                                                      |
 | `mariadbPassword`       | Password for the new user.         | `nil`                                                      |
 | `mariadbDatabase`       | Name for new database to create.   | `nil`                                                      |
+| `persistence.enabled`          | Use a PVC to persist data           | `true`                                       |
+| `persistence.storageClass`     | Storage class of backing PVC        | `generic`                                    |
+| `persistence.accessMode`       | Use volume as ReadOnly or ReadWrite | `ReadWriteOnce`                              |
+| `persistence.size`             | Size of data volume                 | `8Gi`                                        |
 
 The above parameters map to the env variables defined in [bitnami/mariadb](http://github.com/bitnami/bitnami-docker-mariadb). For more information please refer to the [bitnami/mariadb](http://github.com/bitnami/bitnami-docker-mariadb) image documentation.
 
@@ -85,38 +89,4 @@ $ helm install --name my-release -f values.yaml mariadb-x.x.x.tgz
 
 The [Bitnami MariaDB](https://github.com/bitnami/bitnami-docker-mariadb) image stores the MariaDB data and configurations at the `/bitnami/mariadb` path of the container.
 
-As a placeholder, the chart mounts an [emptyDir](http://kubernetes.io/docs/user-guide/volumes/#emptydir) volume at this location.
-
-> *"An emptyDir volume is first created when a Pod is assigned to a Node, and exists as long as that Pod is running on that node. When a Pod is removed from a node for any reason, the data in the emptyDir is deleted forever."*
-
-For persistence of the data you should replace the `emptyDir` volume with a persistent [storage volume](http://kubernetes.io/docs/user-guide/volumes/), else the data will be lost if the Pod is shutdown.
-
-### Step 1: Create a persistent disk
-
-You first need to create a persistent disk in the cloud platform your cluster is running. For example, on GCE you can use the `gcloud` tool to create a [gcePersistentDisk](http://kubernetes.io/docs/user-guide/volumes/#gcepersistentdisk):
-
-```bash
-$ gcloud compute disks create --size=500GB --zone=us-central1-a mariadb-data-disk
-```
-
-### Step 2: Update `templates/deployment.yaml`
-
-Replace:
-
-```yaml
-      volumes:
-      - name: data
-        emptyDir: {}
-```
-
-with
-
-```yaml
-      volumes:
-      - name: data
-        gcePersistentDisk:
-          pdName: mariadb-data-disk
-          fsType: ext4
-```
-
-[Install](#installing-the-chart) the chart after making these changes.
+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.

stable/mariadb/templates/deployment.yaml

@@ -57,4 +57,9 @@ spec:
           mountPath: /bitnami/mariadb
       volumes:
       - name: data
+      {{- if .Values.persistence.enabled }}
+        persistentVolumeClaim:
+          claimName: {{ template "fullname" . }}
+      {{- else }}
         emptyDir: {}
+      {{- end -}}

stable/mariadb/templates/pvc.yaml

@@ -0,0 +1,14 @@
+{{- if .Values.persistence.enabled }}
+kind: PersistentVolumeClaim
+apiVersion: v1
+metadata:
+  name: {{ template "fullname" . }}
+  annotations:
+    volume.alpha.kubernetes.io/storage-class: {{ .Values.persistence.storageClass | quote }}
+spec:
+  accessModes:
+    - {{ .Values.persistence.accessMode | quote }}
+  resources:
+    requests:
+      storage: {{ .Values.persistence.size | quote }}
+{{- end }}

stable/mariadb/values.yaml

@@ -25,3 +25,10 @@ image: bitnami/mariadb:10.1.17-r1
 ## ref: https://github.com/bitnami/bitnami-docker-mariadb/blob/master/README.md#creating-a-database-on-first-run
 ##
 # mariadbDatabase:
+
+## Persist data to a persitent volume
+persistence:
+  enabled: true
+  storageClass: generic
+  accessMode: ReadWriteOnce
+  size: 8Gi