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'