# kubectl port-forward svc/postgres -n postgres-namespace 5432:5432
# PGPASSWORD=posPGPASSWORD=postgres psql -h localhost -U postgres -d postgres

---
apiVersion: v1
kind: Namespace
metadata:
  name: postgres-namespace
  labels:
    app: postgres

---
apiVersion: v1
kind: ConfigMap
metadata:
  name: postgres-config
  namespace: postgres-namespace
data:
  postgres.conf: |
    listen_addresses = '*'
    max_connections = 100
    shared_buffers = 128MB
    log_statement = 'all'
    log_directory = 'pg_log'
    log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log'
    log_rotation_age = 1d
    log_rotation_size = 10MB

---
apiVersion: v1
kind: Secret
metadata:
  name: postgres-secret
  namespace: postgres-namespace
type: Opaque
data:
  # "postgres" encoded in base64
  password: cG9zdGdyZXM=

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: postgres
  namespace: postgres-namespace
spec:
  replicas: 1
  selector:
    matchLabels:
      app: postgres
  template:
    metadata:
      labels:
        app: postgres
    spec:
      containers:
      - name: postgres
        image: postgres:14
        ports:
        - containerPort: 5432
        env:
        - name: POSTGRES_USER
          value: postgres
        - name: POSTGRES_PASSWORD
          valueFrom:
            secretKeyRef:
              name: postgres-secret
              key: password
        - name: POSTGRES_DB
          value: postgres
        - name: PGDATA
          value: /var/lib/postgresql/data/pgdata
        volumeMounts:
        - name: postgres-config-volume
          mountPath: /etc/postgresql/conf.d
        - name: postgres-data
          mountPath: /var/lib/postgresql/data
        readinessProbe:
          exec:
            command:
            - pg_isready
            - -U
            - postgres
          initialDelaySeconds: 5
          periodSeconds: 10
        livenessProbe:
          exec:
            command:
            - pg_isready
            - -U
            - postgres
          initialDelaySeconds: 30
          periodSeconds: 10
      volumes:
      - name: postgres-config-volume
        configMap:
          name: postgres-config
      # In a production environment, this would be a PersistentVolumeClaim
      - name: postgres-data
        emptyDir: {}

---
apiVersion: v1
kind: Service
metadata:
  name: postgres
  namespace: postgres-namespace
  labels:
    service: postgres
spec:
  selector:
    app: postgres
  ports:
  - port: 5432
    targetPort: 5432
  type: ClusterIP

repositories:
  - name: prometheus-community
    url: https://prometheus-community.github.io/helm-charts

releases:
  - name: prometheus-stack
    namespace: monitoring
    createNamespace: true
    chart: prometheus-community/kube-prometheus-stack
    version: 71.2.0
    values:
      - ./values.yaml

  - name: postgres-exporter
    namespace: postgres-namespace
    createNamespace: true
    chart: prometheus-community/prometheus-postgres-exporter
    version: 6.0.0
    values:
      - serviceMonitor:
          enabled: true
          namespace: postgres-namespace
          # prometheusで許可されているラベルを指定
          labels:
            release: prometheus-stack
          # postgres serviceのlabelを指定
          targetLabels:
            - service

alertmanager:
  enabled: false
nodeExporter:
  enabled: false
prometheus:
  enabled: true
  prometheusSpec:
    serviceMonitorSelector: {}
    serviceMonitorNamespaceSelector: {}
grafana:
  enabled: true
  adminPassword: admin
kubeStateMetrics:
  enabled: false
prometheusOperator:
  enabled: true
  manageCrds: true
defaultRules:
  create: true