feat(postgres): Add Component for HA multi-cluster replication

ref: #18

manifests/postgres/components/ha/Cluster-main-02.yaml

@@ -0,0 +1,86 @@
+---
+apiVersion: postgresql.cnpg.io/v1
+kind: Cluster
+metadata:
+  labels:
+    app.kubernetes.io/component: ha
+    app.kubernetes.io/instance: production
+    app.kubernetes.io/name: postgres
+    app.kubernetes.io/part-of: production-ha
+  name: main-02
+spec:
+  affinity:
+    additionalPodAntiAffinity:
+      preferredDuringSchedulingIgnoredDuringExecution:
+        - weight: 50
+          podAffinityTerm:
+            labelSelector:
+              matchExpressions:
+                - key: kubernetes.io/hostname
+                  operator: Exists
+            topologyKey: kubernetes.io/hostname
+
+    enablePodAntiAffinity: true
+    nodeAffinity:
+      preferredDuringSchedulingIgnoredDuringExecution:
+        - weight: 100
+          preference:
+            matchExpressions:
+              - key: node-role.kubernetes.io/prime
+                operator: Exists
+    topologyKey: kubernetes.io/hostname
+
+  bootstrap:
+    pg_basebackup:
+      source: main-01
+
+  description: "Cluster PostgreSQL Instance"
+
+  enableSuperuserAccess: false
+
+  externalClusters: []
+
+  imageName: ghcr.io/cloudnative-pg/postgresql:-updated_by_patch-
+
+  inheritedMetadata:
+    labels:
+      app.kubernetes.io/component: ha
+      app.kubernetes.io/instance: production
+      app.kubernetes.io/name: postgres
+      app.kubernetes.io/part-of: production-ha
+
+  instances: 3
+
+  monitoring: {}
+
+  nodeMaintenanceWindow:
+    inProgress: false
+    reusePVC: false
+
+  primaryUpdateStrategy: supervised
+
+  postgresql:
+    parameters:
+      max_parallel_workers: '34'
+      max_replication_slots: '32'
+      max_worker_processes: '34'
+
+  replica:
+    primary: main-01
+    source: main-01
+
+  resources:
+    requests:
+      cpu: "100m"
+      memory: "100Mi"
+    limits:
+      cpu: "2"
+      memory: "1Gi"
+
+  startDelay: 300
+
+  stopDelay: 300
+
+  storage:
+    resizeInUseVolumes: false
+    size: 10Gi

manifests/postgres/components/ha/Service-main-r.yaml

@@ -0,0 +1,21 @@
+---
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    app.kubernetes.io/component: ha
+    app.kubernetes.io/instance: production
+    app.kubernetes.io/name: postgres
+    app.kubernetes.io/part-of: production-ha
+  name: main-r
+spec:
+  ports:
+    - name: postgres
+      port: 5432
+      protocol: TCP
+      targetPort: 5432
+  selector:
+    cnpg.io/cluster: -updated_by_replacement-
+    cnpg.io/podRole: instance
+  sessionAffinity: None
+  type: ClusterIP

manifests/postgres/components/ha/Service-main-ro.yaml

@@ -0,0 +1,21 @@
+---
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    app.kubernetes.io/component: ha
+    app.kubernetes.io/instance: production
+    app.kubernetes.io/name: postgres
+    app.kubernetes.io/part-of: production-ha
+  name: main-ro
+spec:
+  ports:
+    - name: postgres
+      port: 5432
+      protocol: TCP
+      targetPort: 5432
+  selector:
+    cnpg.io/cluster: -updated_by_replacement-
+    cnpg.io/instanceRole: replica
+  sessionAffinity: None
+  type: ClusterIP

manifests/postgres/components/ha/Service-main-rw.yaml

@@ -0,0 +1,21 @@
+---
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    app.kubernetes.io/component: ha
+    app.kubernetes.io/instance: production
+    app.kubernetes.io/name: postgres
+    app.kubernetes.io/part-of: production-ha
+  name: main-rw
+spec:
+  ports:
+    - name: postgres
+      port: 5432
+      protocol: TCP
+      targetPort: 5432
+  selector:
+    cnpg.io/cluster: -updated_by_replacement-
+    cnpg.io/instanceRole: primary
+  sessionAffinity: None
+  type: ClusterIP

manifests/postgres/components/ha/kustomization.yaml

@@ -0,0 +1,140 @@
+---
+
+apiVersion: kustomize.config.k8s.io/v1alpha1
+kind: Component
+
+
+resources:
+  # - ../../base
+  - Cluster-main-02.yaml
+  - Service-main-r.yaml
+  - Service-main-ro.yaml
+  - Service-main-rw.yaml
+
+
+patches:
+
+  # yamllint disable rule:indentation
+  - patch: |-
+
+      - op: add
+        path: /metadata/name
+        value: main-01
+
+      - op: replace
+        path: /spec/replica
+        value:
+          primary: main-01
+          source: main-02
+
+      # yamllint enable rule:indentation
+    target:
+      group: postgresql.cnpg.io
+      version: v1
+      kind: Cluster
+      name: main
+
+  # yamllint disable rule:indentation
+  - patch: |-
+
+      - op: replace
+        path: /spec/externalClusters
+        value:
+
+          - name: main-01
+            connectionParameters:
+              host: main-01-rw.updated_by_replacement.svc
+              user: streaming_replica
+              dbname: postgres
+              sslmode: verify-full
+            sslKey:
+              name: main-01-replication
+              key: tls.key
+            sslCert:
+              name: main-01-replication
+              key: tls.crt
+            sslRootCert:
+              name: main-01-ca
+              key: ca.crt
+
+          - name: main-02
+            connectionParameters:
+              host: main-02-rw.updated_by_replacement.svc
+              user: streaming_replica
+              dbname: postgres
+              sslmode: verify-full
+            sslKey:
+              name: main-02-replication
+              key: tls.key
+            sslCert:
+              name: main-02-replication
+              key: tls.crt
+            sslRootCert:
+              name: main-02-ca
+              key: ca.crt
+
+      # yamllint enable rule:indentation
+    target:
+      group: postgresql.cnpg.io
+      version: v1
+      kind: Cluster
+
+
+
+replacements:
+  #
+  # Add to Top-most Kustomization.yaml
+  #
+  # Updates extenal cluster DNS name octet that contains the namespace
+  # - source:
+  #     kind: Cluster
+  #     name: main-01
+  #     fieldPath: metadata.namespace
+  #   targets:
+  #     - select:
+  #         kind: Cluster
+  #       fieldPaths:
+  #         - spec.externalClusters.[name=main-01].connectionParameters.host
+  #         - spec.externalClusters.[name=main-02].connectionParameters.host
+  #       options:
+  #         delimiter: "."
+  #         index: 1
+
+
+  #
+  # Add to Top-most Kustomization.yaml, if primary has be changed
+  #
+  # Updates each of the services to point the cluster that is denoted as primary
+  # within cluster main-02 
+  - source:
+      kind: Cluster
+      name: main-02
+      fieldPath: spec.replica.primary
+    targets:
+      - select:
+          kind: Service
+          name: main-r
+        fieldPaths:
+          - spec.selector.[cnpg.io/cluster]
+      - select:
+          kind: Service
+          name: main-ro
+        fieldPaths:
+          - spec.selector.[cnpg.io/cluster]
+      - select:
+          kind: Service
+          name: main-rw
+        fieldPaths:
+          - spec.selector.[cnpg.io/cluster]
+
+  # Dont change
+  - source:
+      kind: Cluster
+      name: main-02
+      fieldPath: metadata.labels.[app.kubernetes.io/part-of]
+    targets:
+      - select:
+          kind: Cluster
+        fieldPaths:
+          - metadata.labels.[app.kubernetes.io/part-of]
+          - spec.inheritedMetadata.labels.[app.kubernetes.io/part-of]