adding archiving to postgres

To safeguard postgres from clogging up wal files
in pg_xlog directory, This change does the following:
1) adding postgres archiving to move the WAL file to different directory
2) Makes sure that archive is in different Persistent volume.

Change-Id: I59bc76f27384d4f3836ef609855afcc33a7b99d0

postgresql/Chart.yaml

@@ -15,7 +15,7 @@ apiVersion: v1
 appVersion: v9.6
 description: OpenStack-Helm PostgreSQL
 name: postgresql
-version: 0.1.1
+version: 0.1.2
 home: https://www.postgresql.org
 sources:
   - https://github.com/postgres/postgres

postgresql/templates/statefulset.yaml

@@ -204,17 +204,22 @@ spec:
               mountPath: /tmp/readiness.sh
               subPath: readiness.sh
               readOnly: true
-            - name: postgresql-etc
-              mountPath: /tmp/postgresql.conf
-              subPath: postgresql.conf
-              readOnly: true
             - name: postgresql-etc
               mountPath: /tmp/pg_hba.conf
               subPath: pg_hba.conf
               readOnly: true
+            - name: postgresql-etc
+              mountPath: /tmp/postgresql.conf
+              subPath: postgresql.conf
+              readOnly: true
             - name: postgresql-data
               mountPath: {{ .Values.storage.mount.path }}
               subPath: {{ .Values.storage.mount.subpath }}
+{{- if  eq .Values.conf.postgresql.archive_mode "on" }}
+            - name: postgresql-archive
+              mountPath: {{ .Values.storage.archive.mount_path }}
+              subPath: {{ .Values.storage.mount.subpath }}
+{{- end }}
       volumes:
         - name: pod-tmp
           emptyDir: {}
@@ -235,8 +240,10 @@ spec:
         - name: postgresql-data
           hostPath:
             path: {{ .Values.storage.host.host_path }}
-{{- else }}
+{{- end }}
+{{- if or (eq .Values.conf.postgresql.archive_mode "on" )  (eq .Values.storage.pvc.enabled true) }}
   volumeClaimTemplates:
+{{- if  .Values.storage.pvc.enabled }}
     - metadata:
         name: postgresql-data
         annotations:
@@ -247,4 +254,16 @@ spec:
           requests:
             storage: {{ .Values.storage.pvc.size }}
 {{- end }}
+{{- if  eq .Values.conf.postgresql.archive_mode "on" }}
+    - metadata:
+        name: postgresql-archive
+        annotations:
+          {{ .Values.storage.archive_pvc.class_path }}: {{ .Values.storage.archive_pvc.class_name }}
+      spec:
+        accessModes: ["ReadWriteOnce"]
+        resources:
+          requests:
+            storage: {{ .Values.storage.archive_pvc.size }}
+{{- end }}
+{{- end }}
 {{- end }}

postgresql/values.yaml

@@ -164,11 +164,17 @@ storage:
     size: 5Gi
     class_name: general
     class_path: volume.beta.kubernetes.io/storage-class
+  archive_pvc:
+    size: 5Gi
+    class_name: general
+    class_path: volume.beta.kubernetes.io/storage-class
   host:
     host_path: /data/openstack-helm/postgresql
   mount:
     path: /var/lib/postgresql
     subpath: .
+  archive:
+    mount_path: /var/lib/archive
 
 labels:
   server:
@@ -263,7 +269,8 @@ conf:
     host all all 0.0.0.0/0 reject
 
   postgresql:
-    archive_mode: 'off'
+    archive_mode: 'on'
+    archive_command: 'test ! -f /var/lib/archive/%f && gzip < %p > /var/lib/archive/%f'
     cluster_name: 'postgresql'
     datestyle: 'iso, mdy'
     external_pid_file: '/tmp/postgres.pid'