# redis.yaml — Redis 7 缓存 (StatefulSet + Service + 持久化卷)
# ----------------------------------------------------------------------------
# 组件:
#   - redis-headless (Headless Service): StatefulSet 稳定标识 redis-0
#   - redis         (ClusterIP Service): 供后端以 redis:6379 连接
#   - redis         (StatefulSet):        单实例 Redis 7，无密码，db 0
# 持久化: volumeClaimTemplates 2Gi + AOF/RDB 落盘
#
# 部署: kubectl apply -f redis.yaml
# ----------------------------------------------------------------------------
---
# Headless Service — StatefulSet 稳定标识
apiVersion: v1
kind: Service
metadata:
  name: redis-headless
  namespace: devops
  labels:
    app.kubernetes.io/name: redis
    app.kubernetes.io/component: cache
spec:
  clusterIP: None
  selector:
    app.kubernetes.io/name: redis
  ports:
    - name: redis
      port: 6379
      targetPort: 6379
---
# ClusterIP Service — 供应用连接
apiVersion: v1
kind: Service
metadata:
  name: redis
  namespace: devops
  labels:
    app.kubernetes.io/name: redis
    app.kubernetes.io/component: cache
spec:
  type: ClusterIP
  selector:
    app.kubernetes.io/name: redis
  ports:
    - name: redis
      port: 6379
      targetPort: 6379
---
# StatefulSet
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: redis
  namespace: devops
  labels:
    app.kubernetes.io/name: redis
    app.kubernetes.io/component: cache
spec:
  serviceName: redis-headless
  replicas: 1
  selector:
    matchLabels:
      app.kubernetes.io/name: redis
  template:
    metadata:
      labels:
        app.kubernetes.io/name: redis
    spec:
      containers:
        - name: redis
          image: redis:7-alpine
          imagePullPolicy: IfNotPresent
          command: ["redis-server"]
          args:
            - --appendonly yes          # 开启 AOF
            - --save 60 1000            # RDB: 60s 内 1000 次变更快照
            - --databases 1             # 仅使用 db 0
            - --maxmemory 256mb
            - --maxmemory-policy allkeys-lru
          ports:
            - name: redis
              containerPort: 6379
          livenessProbe:
            exec:
              command: ["redis-cli", "ping"]
            initialDelaySeconds: 15
            periodSeconds: 10
          readinessProbe:
            exec:
              command: ["redis-cli", "ping"]
            initialDelaySeconds: 5
            periodSeconds: 10
          resources:
            requests:
              cpu: 50m
              memory: 128Mi
            limits:
              cpu: 250m
              memory: 256Mi
          volumeMounts:
            - name: data
              mountPath: /data
  # ---- 持久化卷 (2Gi) ----
  volumeClaimTemplates:
    - metadata:
        name: data
      spec:
        accessModes: ["ReadWriteOnce"]
        resources:
          requests:
            storage: 2Gi
        # storageClassName: standard   # 按集群实际 StorageClass 调整