add replica import type

charts/postgres-cluster/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v2
 name: postgres-cluster
-version: 1.0.0
+version: 1.1.0
 description: Chart for cloudnative-pg cluster
 keywords:
   - database

charts/postgres-cluster/templates/_bootstrap.tpl

@@ -19,8 +19,39 @@ bootstrap:
       {{- with .Values.cluster.initdb }}
       {{- range .postInitApplicationSQL }}
       {{- printf "- %s" . | nindent 6 }}
-      {{- end -}}
-      {{- end -}}
+      {{- end }}
+      {{- end }}
+{{- else if eq .Values.mode "replica" }}
+  initdb:
+    import:
+      type: {{ .Values.replica.importType }}
+      databases:
+        {{- if and (len .Values.replica.importDatabases gt 1) (.Values.replica.importType eq "microservice") }}
+          {{ fail "Too many databases in import type of microservice!" }}
+        {{- else}}
+        {{- with .Values.replica.importDatabases }}
+        {{- . | toYaml | nindent 8 }}
+        {{- end }}
+        {{- end }}        
+      {{- if .Values.replica.importType eq "monolith" }}
+      roles:
+        {{- with .Values.replica.importRoles }}
+        {{- . | toYaml | nindent 8 }}
+        {{- end }}
+      {{- end }}
+      {{- if and (.Values.replica.postImportApplicationSQL) (.Values.replica.importType eq "microservice") }}
+      postImportApplicationSQL:
+        {{- with .Values.replica.postImportApplicationSQL }}
+        {{- . | toYaml | nindent 8 }}
+        {{- end }}      
+      {{- end }}
+      source:
+        externalCluster: "postgresql-{{ .Release.Name }}-cluster"
+externalClusters:
+  - name: "postgresql-{{ .Release.Name }}-cluster"
+    {{- with .Values.replica.externalCluster }}
+    {{- . | toYaml | nindent 4 }}
+    {{- end }}    
 {{- else if eq .Values.mode "recovery" }}
   recovery:
     {{- with .Values.recovery.pitrTarget.time }}
@@ -46,7 +77,7 @@ externalClusters:
           key: ACCESS_KEY_ID
         secretAccessKey:
           name: {{ include "cluster.recovery.credentials" . }}
-          key: ACCESS_SECRET_KEY       
+          key: ACCESS_SECRET_KEY
       wal:
         compression: {{ .Values.recovery.wal.compression }}
         encryption: {{ .Values.recovery.wal.encryption }}
@@ -54,7 +85,7 @@ externalClusters:
       data:
         compression: {{ .Values.recovery.data.compression }}
         encryption: {{ .Values.recovery.data.encryption }}
-        jobs: {{ .Values.recovery.data.jobs }}          
+        jobs: {{ .Values.recovery.data.jobs }}
 {{- else }}
   {{ fail "Invalid cluster mode!" }}
 {{- end }}

charts/postgres-cluster/values.yaml

@@ -12,8 +12,9 @@ type: postgresql
 
 ###
 # Cluster mode of operation. Available modes:
-# * `standalone` - default mode. Creates new or updates an existing CNPG cluster.
+# * `standalone` - Default mode. Creates new or updates an existing CNPG cluster.
 # * `recovery` - Same as standalone but creates a cluster from a backup, object store or via pg_basebackup
+# * `replica` - Create database as a replica from another CNPG cluster
 mode: standalone
 
 # Generates bucket name and path for recovery and backup, creates: <endpointBucket>/<clusterName>/postgresql/{{ .Release.Name }}
@@ -126,6 +127,32 @@ recovery:
     # Number of data files to be archived or restored in parallel.
     jobs: 2
 
+replica:
+  # See https://cloudnative-pg.io/documentation/current/database_import/
+  # * `microservice` - Single database import as expected from cnpg clusters
+  # * `monolith` - Import multiple databases and roles
+  importType: microservice
+
+  # If type microservice only one database is allowed, default is app as standard in cnpg clusters
+  importDatabases:
+    - app
+  
+  # If type microservice no roles are imported and ignored
+  importRoles: []
+
+  # If import type is monolith postImportApplicationSQL is not supported and ignored
+  postImportApplicationSQL: []
+
+  # External cluster connection, password specifies a secret name and the key containing the password value
+  externalCluster:
+    connectionParameters:
+      host: postgresql
+      user: app
+      dbname: app
+    password:
+      name: postgresql
+      key: password
+
 backup:
   enabled: false