postgres-ng: add support for running periodic tasks via cron

common/postgresql-ng/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v2
 name: postgresql-ng
-version: 1.0.28 # this version number is SemVer as it gets used to auto bump
+version: 1.0.29 # this version number is SemVer as it gets used to auto bump
 description: Chart for PostgreSQL
 keywords:
 - postgresql

common/postgresql-ng/templates/configmap.yaml

@@ -1,3 +1,13 @@
+{{- if .Values.crontab }}
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ template "postgres.fullname" . }}-crontab
+data:
+  root: |
+    {{ .Values.crontab }}
+{{- end }}
 ---
 apiVersion: v1
 kind: ConfigMap

common/postgresql-ng/templates/deployment.yaml

@@ -131,6 +131,19 @@ spec:
         - name: dev-shm
           mountPath: /dev/shm
         {{- end }}
+      {{- if .Values.crontab }}
+      - name: cron
+        image: "{{ include "preferredRegistry" . }}/shared-app-images/alpine-psql:3.20-latest"
+        command:
+          - /bin/sh
+          - -c
+          - |
+            /usr/bin/crontab /crontab/root
+            exec crond -f -d8
+        volumeMounts:
+        - name: crontab
+          mountPath: /crontab
+      {{- end }}
       serviceAccountName: {{ template "postgres.fullname" . }}
       volumes:
       - name: postgres-etc
@@ -143,7 +156,12 @@ spec:
       {{- else }}
         emptyDir: {}
       {{- end }}
-        {{- if .Values.sqlOnCreate }}
+      {{- if .Values.crontab }}
+      - name: crontab
+        configMap:
+          name: {{ template "postgres.fullname" . }}-crontab
+      {{- end }}
+      {{- if .Values.sqlOnCreate }}
       - name: sql-on-create
         configMap:
           name: {{ template "postgres.fullname" . }}-sql-on-create

common/postgresql-ng/values.yaml

@@ -50,6 +50,11 @@ users:
 
 createMetricsUser: true
 
+# crontab to run in a side container to execute routine maintenance tasks
+# example:
+# 42 23 * * * psql -tAd acme-db -c "VACUUM ANALYZE"
+crontab: ""
+
 # Persist data to a persistent volume
 persistence:
   enabled: true

openstack/keppel/values.yaml

@@ -103,6 +103,8 @@ postgresql:
     # We previously had 128, which should technically be enough for 6 API pods and 1 janitor pod (with max. 16 conns each)
     # as well as the pgmetrics and pgbackup pods with 1-2 conns each, but we still had a "too many clients already" issue regardless.
     max_connections: 160
+  crontab: |
+    30 14 * * 1,2,3,4,5 psql -tAd keppel -c "VACUUM ANALYZE"
   persistence:
     enabled: true
     accessMode: ReadWriteOnce # compatibility to allow easy upgrades