Kubernetes PostgreSQL

PostgreSQL Setup

• Create configmap

cat > postgres-configmap.yaml << EOF
apiVersion: v1
kind: ConfigMap
metadata:
  name: postgres-configuration
  labels:
    app: postgres
data:
  POSTGRES_DB: somedb
  POSTGRES_USER: someuser
  POSTGRES_PASSWORD: somepass
EOF

• kubectl apply -f postgres-configmap.yaml

---

• Create Postgres install

cat > postgres.yaml << EOF
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: postgres-statefulset
  labels:
    app: postgres
spec:
  serviceName: "postgres"
  replicas: 1
  selector:
    matchLabels:
      app: postgres
  template:
    metadata:
      labels:
        app: postgres
    spec:
      containers:
        - name: postgres
          image: postgres:latest
          envFrom:
            - configMapRef:
                name: postgres-configuration
          ports:
            - containerPort: 5432
              name: postgresdb
          volumeMounts:
            - name: pv-data
              mountPath: /var/lib/postgresql/data
      volumes:
        - name: pv-data
          persistentVolumeClaim:
            claimName: nfs-pvc
EOF

• kubectl apply -f postgres.yaml

---

• Create service

cat > postgres-service.yaml << EOF
apiVersion: v1
kind: Service
metadata:
  name: postgres-service
  labels:
    app: postgres
spec:
  ports:
    - port: 5432
      name: postgres
  type: NodePort
  selector:
    app: postgres
EOF

• kubectl apply -f postgres-service.yaml

---

• Helper commands
  • kubectl logs -f postgres-statefulset-0
  • kubectl describe svc

---

• Clean up
  • kubectl delete configmap postgres-configuration
  • kubectl delete statefulsets postgres
  • kubectl delete svc postgres-service