feat(aula-17): adicionar Cloud Native PostgreSQL (CNPG)

- Cluster PostgreSQL 3 instâncias com anti-affinity por hostname (hard) e por zona (soft) para spread entre datacenters Hetzner - Backup automático via Barman Cloud para Hetzner Object Storage (S3) - ScheduledBackup diário às 03:00 - App demo que valida conexão com o banco - setup.sh: instala operator, cria cluster, deploya demo - cleanup.sh: remoção limpa (backups S3 preservados)
2026-05-09 02:14:22 -03:00
parent 5634c5f98f
commit 17a2891329
10 changed files with 1016 additions and 1 deletions
@@ -0,0 +1,89 @@
+apiVersion: postgresql.cnpg.io/v1
+kind: Cluster
+metadata:
+  name: shared-postgres
+  namespace: cnpg
+spec:
+  imageName: ghcr.io/cloudnative-pg/postgresql:17.2-4
+  instances: 3
+  enableSuperuserAccess: true
+  # ── Topology-aware placement ──
+  # Hetzner CCM labels nodes automatically:
+  #   topology.kubernetes.io/zone   = fsn1 | nbg1 | hel1  (datacenter)
+  #   topology.kubernetes.io/region = eu-central | hel-southeast
+  #
+  # Layer 1: podAntiAffinity on hostname (hard constraint)
+  #   → No 2 PG pods on the same node. Ever.
+  #
+  # Layer 2: podAntiAffinity on zone (soft constraint)
+  #   → Prefer spreading across datacenters. With nodes in fsn1, nbg1, hel1,
+  #     you get 1 pod per DC. With only eu-central nodes, they still spread
+  #     across FSN and NBG (both in eu-central, ~1-2ms apart).
+  #
+  # Prerequisite for cross-region (eu-central + HEL):
+  #   - Node pool in eu-central (FSN + NBG) → aula-08
+  #   - Node pool in hel-southeast (HEL)    → add worker after aula-08
+  #   - Without HEL nodes, all 3 pods stay in eu-central (still HA within region)
+  affinity:
+    topologyKey: kubernetes.io/hostname
+    podAntiAffinityType: required
+    podAntiAffinity:
+      preferredDuringSchedulingIgnoredDuringExecution:
+        - weight: 100
+          podAffinityTerm:
+            topologyKey: topology.kubernetes.io/zone
+            labelSelector:
+              matchLabels:
+                cnpg.io/cluster: shared-postgres
+  storage:
+    size: 10Gi
+    storageClass: hcloud-volumes
+  walStorage:
+    size: 5Gi
+    storageClass: hcloud-volumes
+  resources:
+    requests:
+      cpu: 500m
+      memory: 1Gi
+    limits:
+      cpu: "1"
+      memory: 1Gi
+  postgresql:
+    parameters:
+      max_connections: "100"
+      shared_buffers: "256MB"
+      effective_cache_size: "512MB"
+      work_mem: "4MB"
+      maintenance_work_mem: "128MB"
+      log_min_duration_statement: "1000"
+  bootstrap:
+    initdb:
+      database: app
+      owner: app
+      secret:
+        name: shared-postgres-superuser
+  superuserSecret:
+    name: shared-postgres-superuser
+  backup:
+    barmanObjectStore:
+      destinationPath: s3://CHANGE_BUCKET_NAME/cnpg-backups/shared-postgres
+      endpointURL: https://CHANGE_ENDPOINT
+      s3Credentials:
+        accessKeyId:
+          name: cnpg-backup-credentials
+          key: ACCESS_KEY_ID
+        secretAccessKey:
+          name: cnpg-backup-credentials
+          key: ACCESS_SECRET_KEY
+      wal:
+        compression: gzip
+      data:
+        compression: gzip
+        jobs: 2
+    retentionPolicy: "30d"
+  monitoring:
+    enablePodMonitor: true
+  startDelay: 3600
+  livenessProbeTimeout: 90
+  primaryUpdateStrategy: unsupervised
+  primaryUpdateMethod: switchover