[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.
 

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: