[bitnami/postgresql] extended configuration for read replicas (#11458)

fix for #11450

Signed-off-by: AlexeyAnufriev <contact@alexey-anufriev.com>

bitnami/postgresql/README.md

@@ -264,6 +264,7 @@ kubectl delete pvc -l release=my-release
 | Name                                              | Description                                                                                                              | Value                 |
 | ------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------ | --------------------- |
 | `readReplicas.replicaCount`                       | Number of PostgreSQL read only replicas                                                                                  | `1`                   |
+| `readReplicas.extendedConfiguration`              | Extended PostgreSQL read only replicas configuration (appended to main or default configuration)                         | `""`                  |
 | `readReplicas.extraEnvVars`                       | Array with extra environment variables to add to PostgreSQL read only nodes                                              | `[]`                  |
 | `readReplicas.extraEnvVarsCM`                     | Name of existing ConfigMap containing extra env vars for PostgreSQL read only nodes                                      | `""`                  |
 | `readReplicas.extraEnvVarsSecret`                 | Name of existing Secret containing extra env vars for PostgreSQL read only nodes                                         | `""`                  |
@@ -494,7 +495,7 @@ To modify the application version used in this chart, specify a different versio
 
 ### postgresql.conf / pg_hba.conf files as configMap
 
-This helm chart also supports to customize the PostgreSQL configuration file. You can add additional PostgreSQL configuration parameters using the `primary.extendedConfiguration` parameter as a string. Alternatively, to replace the entire default configuration use `primary.configuration`.
+This helm chart also supports to customize the PostgreSQL configuration file. You can add additional PostgreSQL configuration parameters using the `primary.extendedConfiguration`/`readReplicas.extendedConfiguration` parameters as a string. Alternatively, to replace the entire default configuration use `primary.configuration`.
 
 You can also add a custom pg_hba.conf using the `primary.pgHbaConfiguration` parameter.
 
@@ -672,4 +673,4 @@ 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.
+limitations under the License.

bitnami/postgresql/templates/_helpers.tpl

@@ -213,6 +213,13 @@ Get the PostgreSQL primary extended configuration ConfigMap name.
 {{- end -}}
 {{- end -}}
 
+{{/*
+Get the PostgreSQL read replica extended configuration ConfigMap name.
+*/}}
+{{- define "postgresql.readReplicas.extendedConfigmapName" -}}
+    {{- printf "%s-extended-configuration" (include "postgresql.readReplica.fullname" .) -}}
+{{- end -}}
+
 {{/*
 Return true if a configmap object should be created for PostgreSQL primary with the extended configuration
 */}}
@@ -223,6 +230,16 @@ Return true if a configmap object should be created for PostgreSQL primary with
 {{- end -}}
 {{- end -}}
 
+{{/*
+Return true if a configmap object should be created for PostgreSQL read replica with the extended configuration
+*/}}
+{{- define "postgresql.readReplicas.createExtendedConfigmap" -}}
+{{- if .Values.readReplicas.extendedConfiguration }}
+    {{- true -}}
+{{- else -}}
+{{- end -}}
+{{- end -}}
+
 {{/*
  Create the name of the service account to use
  */}}

bitnami/postgresql/templates/read/extended-configmap.yaml

@@ -0,0 +1,18 @@
+{{- if (include "postgresql.readReplicas.createExtendedConfigmap" .) }}
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ printf "%s-extended-configuration" (include "postgresql.readReplica.fullname" .) }}
+  namespace: {{ .Release.Namespace | quote }}
+  labels: {{- include "common.labels.standard" . | nindent 4 }}
+    app.kubernetes.io/component: read
+    {{- if .Values.commonLabels }}
+    {{- include "common.tplvalues.render" ( dict "value" .Values.commonLabels "context" $ ) | nindent 4 }}
+    {{- end }}
+  {{- if .Values.commonAnnotations }}
+  annotations: {{- include "common.tplvalues.render" ( dict "value" .Values.commonAnnotations "context" $ ) | nindent 4 }}
+  {{- end }}
+data:
+  override.conf: |-
+    {{- include "common.tplvalues.render" ( dict "value" .Values.readReplicas.extendedConfiguration "context" $ ) | nindent 4 }}
+{{- end }}

bitnami/postgresql/templates/read/statefulset.yaml

@@ -41,6 +41,9 @@ spec:
         {{- include "common.tplvalues.render" ( dict "value" .Values.readReplicas.podLabels "context" $ ) | nindent 8 }}
         {{- end }}
       annotations:
+        {{- if (include "postgresql.readReplicas.createExtendedConfigmap" .) }}
+        checksum/extended-configuration: {{ include (print $.Template.BasePath "/read/extended-configmap.yaml") . | sha256sum }}
+        {{- end }}
         {{- if .Values.readReplicas.podAnnotations }}
         {{- include "common.tplvalues.render" ( dict "value" .Values.readReplicas.podAnnotations "context" $ ) | nindent 8 }}
         {{- end }}
@@ -358,6 +361,10 @@ spec:
             - name: postgresql-password
               mountPath: /opt/bitnami/postgresql/secrets/
             {{- end }}
+            {{- if .Values.readReplicas.extendedConfiguration }}
+            - name: postgresql-extended-config
+              mountPath: /bitnami/postgresql/conf/conf.d/
+            {{- end }}
             {{- if .Values.tls.enabled }}
             - name: postgresql-certificates
               mountPath: /opt/bitnami/postgresql/certs
@@ -466,6 +473,11 @@ spec:
         {{- include "common.tplvalues.render" ( dict "value" .Values.readReplicas.sidecars "context" $ ) | nindent 8 }}
         {{- end }}
       volumes:
+        {{- if .Values.readReplicas.extendedConfiguration }}
+        - name: postgresql-extended-config
+          configMap:
+            name: {{ include "postgresql.readReplicas.extendedConfigmapName" . }}
+        {{- end }}
         {{- if .Values.auth.usePasswordFiles }}
         - name: postgresql-password
           secret:

bitnami/postgresql/values.yaml

@@ -674,6 +674,10 @@ readReplicas:
   ## @param readReplicas.replicaCount Number of PostgreSQL read only replicas
   ##
   replicaCount: 1
+  ## @param readReplicas.extendedConfiguration Extended PostgreSQL read only replicas configuration (appended to main or default configuration)
+  ## ref: https://github.com/bitnami/containers/tree/main/bitnami/postgresql#allow-settings-to-be-loaded-from-files-other-than-the-default-postgresqlconf
+  ##
+  extendedConfiguration: ""
   ## @param readReplicas.extraEnvVars Array with extra environment variables to add to PostgreSQL read only nodes
   ## e.g:
   ## extraEnvVars: