feat(stable/influx): Add the ability to specify already existing pvc (#777)

stable/influxdb/Chart.yaml

 name: influxdb
-version: 0.3.0
+version: 0.4.0
 description: Scalable datastore for metrics, events, and real-time analytics.
 keywords:
 - influxdb

stable/influxdb/templates/deployment.yaml

@@ -63,8 +63,13 @@ spec:
       volumes:
       - name: data
       {{- if .Values.persistence.enabled }}
+        {{- if .Values.persistence.useExisting }}
+        persistentVolumeClaim:
+          claimName: {{ .Values.persistence.name }}
+        {{- else }}
         persistentVolumeClaim:
           claimName: {{ template "fullname" . }}
+        {{- end }}
       {{- else }}
         emptyDir: {}
       {{- end }}

stable/influxdb/templates/pvc.yaml

-{{- if .Values.persistence.enabled }}
+{{- if and (.Values.persistence.enabled) (not .Values.persistence.useExisting) }}
 kind: PersistentVolumeClaim
 apiVersion: v1
 metadata:

stable/influxdb/values.yaml

@@ -16,6 +16,10 @@ service:
 ##
 persistence:
   enabled: false
+  ## If true will use an existing PVC instead of creating one
+  # useExisting: false
+  ## Name of existing PVC to be used in the influx deployment
+  # name: 
   ## If defined, volume.beta.kubernetes.io/storage-class: <storageClass>
   ## Default: volume.alpha.kubernetes.io/storage-class: default
   ##