refactor persistent volume configuration (#565)

Co-authored-by: Aleksandr Cupacenko <alcu@danskebank.lt>

charts/helm-dashboard/README.md

@@ -75,7 +75,8 @@ The following table lists the configurable parameters of the chart and their def
 | `dashboard.persistence.accessModes`   | Persistent Volume access modes                                                                 | `["ReadWriteOnce"]`              |
 | `dashboard.persistence.storageClass`  | Persistent Volume storage class                                                                | `""`                             |
 | `dashboard.persistence.size`          | Persistent Volume size                                                                         | `100M`                           |
-| `dashboard.persistence.hostPath`      | Set path in case you want to use local host path volumes (not recommended in production)       | `""`                             |
+| `dashboard.persistence.finalizers`    | Finalizers for the Persistent Volume Claim                                                     | `[kubernetes.io/pvc-protection]`                             |
+| `dashboard.persistence.lookupVolumeName` | Lookup volume name for the Persistent Volume Claim                                             | `true`                             |
 | `updateStrategy.type`                 | Set up update strategy for helm-dashboard installation.                                        | `RollingUpdate`                  |             
 | `extraArgs`                           | Set the arguments to be supplied to the helm-dashboard binary                                  | `[--no-browser, --bind=0.0.0.0]` |
 | `testImage.repository`                | Test image registry/name                                                                       | `busybox`                        |

charts/helm-dashboard/templates/pvc.yaml

@@ -10,47 +10,22 @@ metadata:
   annotations:
     {{- toYaml . | nindent 4 }}
   {{- end }}
-spec:
+  {{- with .Values.dashboard.persistence.finalizers }}
-  {{- if .Values.dashboard.persistence.hostPath }}
+  finalizers:
-  storageClassName: ""
-  {{- else }}
-  {{- if kindIs "string" .Values.dashboard.persistence.storageClass }}
-  storageClassName: "{{ .Values.dashboard.persistence.storageClass }}"
-  {{- end }}
-  {{- end }}
-  accessModes:
-  {{- if not (empty .Values.dashboard.persistence.accessModes) }}
-  {{- range .Values.dashboard.persistence.accessModes }}
-    - {{ . | quote }}
-  {{- end }}
-  {{- end }}
-  resources:
-    requests:
-      storage: {{ .Values.dashboard.persistence.size | quote }}
-{{- end }}
-
----
-{{- if and .Values.dashboard.persistence.enabled .Values.dashboard.persistence.hostPath -}}
-apiVersion: v1
-kind: PersistentVolume
-metadata:
-  name: {{ include "helm-dashboard.fullname" . }}
-  namespace: {{ .Release.Namespace | quote }}
-  labels:
-    {{- include "helm-dashboard.labels" . | nindent 4 }}
-  {{- with .Values.dashboard.persistence.annotations }}
-  annotations:
     {{- toYaml . | nindent 4 }}
   {{- end }}
 spec:
   accessModes:
-  {{- if not (empty .Values.dashboard.persistence.accessModes) }}
   {{- range .Values.dashboard.persistence.accessModes }}
     - {{ . | quote }}
   {{- end }}
+  resources:
+    requests:
+      storage: {{ .Values.dashboard.persistence.size | quote }}
+  {{- if and (.Values.dashboard.persistence.lookupVolumeName) (lookup "v1" "PersistentVolumeClaim" .Release.Namespace (include "helm-dashboard.fullname" .)) }}
+  volumeName: {{ (lookup "v1" "PersistentVolumeClaim" .Release.Namespace (include "helm-dashboard.fullname" .)).spec.volumeName }}
   {{- end }}
-  capacity:
+  {{- with .Values.dashboard.persistence.storageClassName }}
-    storage: {{ .Values.dashboard.persistence.size | quote }}
+  storageClassName: {{ . }}
-  hostPath:
+  {{- end }}
-    path: {{ .Values.dashboard.persistence.hostPath | quote }}
+{{- end }}
-{{- end -}}

charts/helm-dashboard/values.yaml

@@ -49,12 +49,11 @@ dashboard:
     enabled: true
 
     ## If defined, storageClassName: <storageClass>
-    ## If set to "-", storageClassName: "", which disables dynamic provisioning
     ## If undefined (the default) or set to null, no storageClassName spec is
     ##   set, choosing the default provisioner.  (gp2 on AWS, standard on
     ##   GKE, AWS & OpenStack)
     ##
-    storageClass: null
+    # storageClassName: default
 
     ## Helm Dashboard Persistent Volume access modes
     ## Must match those of existing PV or dynamic provisioner
@@ -71,14 +70,19 @@ dashboard:
     ##
     annotations: {}
 
-    ## Set path in case you want to use local host path volumes (not recommended in production)
+    ## Finalizer to ensure PVC is not deleted until the pod is terminated
     ##
-    hostPath: ""
+    finalizers:
+      - kubernetes.io/pvc-protection
 
     ## Helm Dashboard data Persistent Volume size
     ##
     size: 100M
 
+    ## If 'lookupVolumeName' is set to true, Helm will attempt to retrieve
+    ## the current value of 'spec.volumeName' and incorporate it into the template.
+    lookupVolumeName: true
+
 ## @param.updateStrategy.type Set up update strategy for helm-dashboard installation.
 ## Set to Recreate if you use persistent volume that cannot be mounted by more than one pods to make sure the pods is destroyed first.
 ## ref: https://kubernetes.io/docs/concepts/workloads/controllers/deployment/#strategy

frontend/cypress/fixtures/defaultReleases.json

@@ -74,12 +74,14 @@
 
               },
               "enabled":true,
-              "hostPath":"",
               "labels":{
 
               },
               "size":"100M",
-              "storageClass":null
+              "finalizers":[
+                "kubernetes.io/pvc-protection"
+              ],
+              "lookupVolumeName": true
            }
         },
         "debug":false,