add source code and readme

manifests/infrastructure/postgresql/postgresql-service-alias.yaml

@@ -0,0 +1,64 @@
+---
+# Service alias for backward compatibility
+# This creates "postgresql-shared-rw" service that points to the same endpoints as "postgres-shared-rw"
+# During the disaster recovery, I got the name wrong and dropped 'sql'
+apiVersion: v1
+kind: Service
+metadata:
+  name: postgresql-shared-rw
+  namespace: postgresql-system
+  labels:
+    app: postgresql-shared
+    cnpg.io/cluster: postgres-shared
+    cnpg.io/reload: ""
+spec:
+  type: ClusterIP
+  ports:
+  - name: postgres
+    port: 5432
+    protocol: TCP
+    targetPort: 5432
+  selector:
+    cnpg.io/cluster: postgres-shared
+    cnpg.io/instanceRole: primary
+---
+# Read-only service alias 
+apiVersion: v1
+kind: Service
+metadata:
+  name: postgresql-shared-ro
+  namespace: postgresql-system
+  labels:
+    app: postgresql-shared
+    cnpg.io/cluster: postgres-shared
+    cnpg.io/reload: ""
+spec:
+  type: ClusterIP
+  ports:
+  - name: postgres
+    port: 5432
+    protocol: TCP
+    targetPort: 5432
+  selector:
+    cnpg.io/cluster: postgres-shared
+    cnpg.io/instanceRole: replica
+---
+# Read load-balanced service alias
+apiVersion: v1
+kind: Service
+metadata:
+  name: postgresql-shared-r
+  namespace: postgresql-system
+  labels:
+    app: postgresql-shared
+    cnpg.io/cluster: postgres-shared
+    cnpg.io/reload: ""
+spec:
+  type: ClusterIP
+  ports:
+  - name: postgres
+    port: 5432
+    protocol: TCP
+    targetPort: 5432
+  selector:
+    cnpg.io/cluster: postgres-shared