[PMS] Persistent storage of policies and type definitions

Improvements:
 - Using common metadata for the PV and the PVC.
 - Changed the deployment to a stateful set.

Even Deployments with one replica using ReadWriteOnce volume
are not recommended. This is because the default Deployment
strategy creates a second Pod before bringing down the first Pod
on a recreate. The Deployment may fail in deadlock as the
second Pod can't start because the ReadWriteOnce volume is
already in use, and the first Pod won't be removed because
the second Pod has not yet started.
Instead, use a StatefulSet with ReadWriteOnce volumes.

Change-Id: If3477be43eee5348a9142cceb832bbb2bf9d6017
Issue-ID: CCSDK-3256
Signed-off-by: PatrikBuhr <patrik.buhr@est.tech>

3 files changed, 14 insertions, 79 deletions

diff --git a/kubernetes/a1policymanagement/templates/pv.yaml b/kubernetes/a1policymanagement/templates/pv.yaml
index 904d863b03..0a3cbdeff5 100644
--- a/kubernetes/a1policymanagement/templates/pv.yaml
+++ b/kubernetes/a1policymanagement/templates/pv.yaml
@@ -16,27 +16,5 @@
 ################################################################################
 */}}
 
-{{- if and .Values.persistence.enabled (not .Values.persistence.existingClaim) -}}
-{{- if not .Values.persistence.storageClass -}}
-kind: PersistentVolume
-apiVersion: v1
-metadata:
-  name: {{ include "common.fullname" . }}-data
-  namespace: {{ include "common.namespace" . }}
-  labels:
-    app: {{ include "common.name" . }}
-    chart: "{{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}"
-    release: "{{ include "common.release" . }}"
-    heritage: "{{ .Release.Service }}"
-    name: {{ include "common.fullname" . }}
-spec:
-  capacity:
-    storage: {{ .Values.persistence.size}}
-  accessModes:
-    - {{ .Values.persistence.accessMode }}
-  persistentVolumeReclaimPolicy: {{ .Values.persistence.volumeReclaimPolicy }}
-  storageClassName: "{{ include "common.fullname" . }}-data"
-  hostPath:
-    path: {{ .Values.persistence.mountPath }}/{{ include "common.release" . }}/{{ .Values.persistence.mountSubPath }}/app
-{{- end -}}
-{{- end -}}
+
+{{ include "common.replicaPV" . }}
diff --git a/kubernetes/a1policymanagement/templates/pvc.yaml b/kubernetes/a1policymanagement/templates/pvc.yaml
deleted file mode 100644
index 4183edfdbb..0000000000
--- a/kubernetes/a1policymanagement/templates/pvc.yaml
+++ /dev/null
@@ -1,41 +0,0 @@
-{{/*
-################################################################################
-#   Copyright (c) 2021 Nordix Foundation.                                      #
-#                                                                              #
-#   Licensed under the Apache License, Version 2.0 (the "License");            #
-#   you may not use this file except in compliance with the License.           #
-#   You may obtain a copy of the License at                                    #
-#                                                                              #
-#       http://www.apache.org/licenses/LICENSE-2.0                             #
-#                                                                              #
-#   Unless required by applicable law or agreed to in writing, software        #
-#   distributed under the License is distributed on an "AS IS" BASIS,          #
-#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   #
-#   See the License for the specific language governing permissions and        #
-#   limitations under the License.                                             #
-################################################################################
-*/}}
-
-{{- if and .Values.persistence.enabled (not .Values.persistence.existingClaim) -}}
-kind: PersistentVolumeClaim
-apiVersion: v1
-metadata:
-  name: {{ include "common.fullname" . }}
-  namespace: {{ include "common.namespace" . }}
-  labels:
-    app: {{ include "common.name" . }}
-    chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
-    release: "{{ include "common.release" . }}"
-    heritage: "{{ .Release.Service }}"
-  {{- if .Values.persistence.annotations }}
-  annotations:
-{{ .Values.persistence.annotations | indent 4 }}
-  {{- end }}
-spec:
-  accessModes:
-    - {{ .Values.persistence.accessMode }}
-  resources:
-    requests:
-      storage: {{ .Values.persistence.size }}
-  storageClassName: {{ include "common.fullname" . }}-data
-{{- end -}}
diff --git a/kubernetes/a1policymanagement/templates/deployment.yaml b/kubernetes/a1policymanagement/templates/statefulset.yaml
index 0d8399c8b3..54ee1515bc 100644
--- a/kubernetes/a1policymanagement/templates/deployment.yaml
+++ b/kubernetes/a1policymanagement/templates/statefulset.yaml
@@ -17,17 +17,11 @@
 ################################################################################
 */}}
 
-kind: Deployment
+kind: StatefulSet
 apiVersion: apps/v1
-metadata:
-  name: {{ include "common.fullname" . }}
-  namespace: {{ include "common.namespace" . }}
-  labels:
-    app: {{ include "common.name" . }}
-    chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
-    release: "{{ include "common.release" . }}"
-    heritage: "{{ .Release.Service }}"
+metadata: {{- include "common.resourceMetadata" . | nindent 2 }}
 spec:
+  serviceName: {{ include "common.servicename" . }}
   replicas: {{ index .Values.replicaCount }}
   selector: {{- include "common.selectors" . | nindent 4 }}
   template:
@@ -108,8 +102,8 @@ spec:
           subPath: application_configuration.json
         - name: config
           mountPath: /opt/app/policy-agent/config/application.yaml
-          subPath: application.yaml   
-        - name: vardata
+          subPath: application.yaml
+        - name: {{ include "common.fullname" . }}
           mountPath: "/var/policy-management-service/database"
         resources: {{ include "common.resources" . | nindent 10 }}
       volumes: {{ include "common.certInitializer.volumes" . | nindent 8 }}
@@ -123,6 +117,10 @@ spec:
         - name: config
           emptyDir:
             medium: Memory
-        - name: vardata
-          persistentVolumeClaim:
-            claimName: {{ include "common.fullname" . }}
+{{- if not .Values.persistence.enabled }}
+        - name: {{ include "common.fullname" . }}
+          emptyDir: {}
+{{- else }}
+  volumeClaimTemplates:
+    - {{include "common.PVCTemplate" . | indent 6 | trim }}
+{{- end }}