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feat(postgres): Add Component for HA multi-cluster replication
ref: #18
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‎manifests/postgres/components/ha/Cluster-main-02.yaml‎

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

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

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

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

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

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

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

‎manifests/postgres/components/ha/kustomization.yaml‎

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

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