03-postgres-statefulset.yaml

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: postgres
  namespace: kube-news
  labels:
    app.kubernetes.io/name: postgres
    app.kubernetes.io/part-of: kube-news
spec:
  serviceName: postgres
  replicas: 1
  selector:
    matchLabels:
      app.kubernetes.io/name: postgres
  template:
    metadata:
      labels:
        app.kubernetes.io/name: postgres
        app.kubernetes.io/part-of: kube-news
    spec:
      containers:
        - name: postgres
          image: postgres:16-alpine
          ports:
            - name: postgres
              containerPort: 5432
          envFrom:
            - secretRef:
                name: kube-news-secret
          env:
            # O Postgres grava os dados em /var/lib/postgresql/data; usar um
            # subdiretório evita conflito com o lost+found do volume montado.
            - name: PGDATA
              value: /var/lib/postgresql/data/pgdata
          volumeMounts:
            - name: pgdata
              mountPath: /var/lib/postgresql/data
          readinessProbe:
            exec:
              command: ["pg_isready", "-U", "kubedevnews", "-d", "kubedevnews"]
            initialDelaySeconds: 10
            periodSeconds: 10
            timeoutSeconds: 5
          livenessProbe:
            exec:
              command: ["pg_isready", "-U", "kubedevnews", "-d", "kubedevnews"]
            initialDelaySeconds: 30
            periodSeconds: 15
            timeoutSeconds: 5
          resources:
            requests:
              cpu: "100m"
              memory: "256Mi"
            limits:
              cpu: "500m"
              memory: "512Mi"
  volumeClaimTemplates:
    - metadata:
        name: pgdata
      spec:
        accessModes: ["ReadWriteOnce"]
        resources:
          requests:
            storage: 2Gi