fix: Make the dynamic plugins root PVC storage class configurable [RHDHBUGS-156][RHIDP-5573] (#69)

* Extract the dynamic plugins root PVC spec in a `dynamicPlugins.cache.volumeClaimSpec` field in the values file

This way, the whole PVC spec is configurable, including the storage
class name, along with other things like the PVC size and access modes.

* Bump the Chart version

* Extract the PostgreSQL PVC storageClass field to highlight that this configurable as well

See https://github.com/bitnami/charts/blob/postgresql/12.10.0/bitnami/postgresql/README.md#postgresql-primary-parameters

* Add test values file

* Regenerate README

Author: rm3l

.github/workflows/test.yml

@@ -65,6 +65,19 @@ jobs:
       - name: Create KIND Cluster
         uses: helm/kind-action@a1b0e391336a6ee6713a0583f8c6240d70863de3 # v1.12.0
 
+      - name: Create custom storage class
+        run: |
+          cat <<EOF | kubectl apply -f -
+          apiVersion: storage.k8s.io/v1
+          kind: StorageClass
+          metadata:
+            name: custom-sc
+          # same provisioner as the one used by the default storage class on KinD
+          provisioner: rancher.io/local-path
+          reclaimPolicy: Delete
+          volumeBindingMode: WaitForFirstConsumer
+          EOF
+
       - name: Install Ingress Controller
         run: "helm install ingress-nginx/ingress-nginx --generate-name --set controller.service.type='NodePort' --set controller.admissionWebhooks.enabled=false"
 
@@ -105,6 +118,19 @@ jobs:
       - name: Create KIND Cluster
         uses: helm/kind-action@a1b0e391336a6ee6713a0583f8c6240d70863de3 # v1.12.0
 
+      - name: Create custom storage class
+        run: |
+          cat <<EOF | kubectl apply -f -
+          apiVersion: storage.k8s.io/v1
+          kind: StorageClass
+          metadata:
+            name: custom-sc
+          # same provisioner as the one used by the default storage class on KinD
+          provisioner: rancher.io/local-path
+          reclaimPolicy: Delete
+          volumeBindingMode: WaitForFirstConsumer
+          EOF
+
       - name: Install Ingress Controller
         run: "helm install ingress-nginx/ingress-nginx --generate-name --set controller.service.type='NodePort' --set controller.admissionWebhooks.enabled=false"
 

charts/backstage/Chart.yaml

@@ -44,4 +44,4 @@ sources:
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
 # Versions are expected to follow Semantic Versioning (https://semver.org/)
-version: 2.27.0
+version: 2.28.0

charts/backstage/README.md

@@ -2,7 +2,7 @@
 # RHDH Backstage Helm Chart for OpenShift (Community Version)
 
 [![Artifact Hub](https://img.shields.io/endpoint?url=https://artifacthub.io/badge/repository/rhdh-chart&style=flat-square)](https://artifacthub.io/packages/search?repo=rhdh-chart)
-![Version: 2.27.0](https://img.shields.io/badge/Version-2.27.0-informational?style=flat-square)
+![Version: 2.28.0](https://img.shields.io/badge/Version-2.28.0-informational?style=flat-square)
 ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square)
 
 A Helm chart for deploying Red Hat Developer Hub.
@@ -141,6 +141,7 @@ Kubernetes: `>= 1.25.0-0`
 
 | Key | Description | Type | Default |
 |-----|-------------|------|---------|
+| dynamicPlugins.cache.volumeClaimSpec | Spec of the dynamic plugins root volume claim. <br/> Note that, by default, this is set to use the default storage class, if available in the cluster. | object | `{"accessModes":["ReadWriteOnce"],"resources":{"requests":{"storage":"5Gi"}},"storageClassName":null}` |
 | global.auth | Enable service authentication within Backstage instance | object | `{"backend":{"enabled":true,"existingSecret":"","value":""}}` |
 | global.auth.backend | Backend service to service authentication <br /> Ref: https://backstage.io/docs/auth/service-to-service-auth/ | object | `{"enabled":true,"existingSecret":"","value":""}` |
 | global.auth.backend.enabled | Enable backend service to service authentication, unless configured otherwise it generates a secret value | bool | `true` |

charts/backstage/ci/with-custom-dynamic-pvc-claim-spec-values.yaml

@@ -0,0 +1,18 @@
+# Workaround for kind cluster in CI which has no Routes
+route:
+  enabled: false
+upstream:
+  postgresql:
+    primary:
+      persistence:
+        # This custom-sc storage class is created in the test GH Workflow
+        storageClass: custom-sc
+
+dynamicPlugins:
+  cache:
+    volumeClaimSpec:
+      resources:
+        requests:
+          storage: 3Gi
+      # This custom-sc storage class is created in the test GH Workflow
+      storageClassName: custom-sc

charts/backstage/templates/pvcs.yaml

@@ -3,8 +3,4 @@ apiVersion: v1
 metadata:
   name: {{ printf "%s-dynamic-plugins-root" .Release.Name }}
 spec:
-  accessModes:
-    - ReadWriteOnce
-  resources:
-    requests:
-      storage: 5Gi
+  {{- toYaml .Values.dynamicPlugins.cache.volumeClaimSpec | nindent 2 }}

charts/backstage/values.yaml

@@ -253,6 +253,7 @@ upstream:
         enabled: true
         size: 1Gi
         mountPath: /var/lib/pgsql/data
+        storageClass: null
       extraEnvVars:
         - name: POSTGRESQL_ADMIN_PASSWORD
           valueFrom:
@@ -307,3 +308,15 @@ route:
     # --  Indicates the desired behavior for insecure connections to a route.
     # <br /> While each router may make its own decisions on which ports to expose, this is normally port 80. The only valid values are None, Redirect, or empty for disabled.
     insecureEdgeTerminationPolicy: "Redirect"
+
+dynamicPlugins:
+  cache:
+    # -- Spec of the dynamic plugins root volume claim.
+    # <br/> Note that, by default, this is set to use the default storage class, if available in the cluster.
+    volumeClaimSpec:
+      accessModes:
+        - ReadWriteOnce
+      resources:
+        requests:
+          storage: 5Gi
+      storageClassName: null