Kubernetes 工作负载

apiVersion: apps/v1
kind: Deployment
metadata:
  name: web-app
spec:
  replicas: 6
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 2          # 最多额外启动 2 个 Pod
      maxUnavailable: 1    # 最多允许 1 个 Pod 不可用
  selector:
    matchLabels:
      app: web
  template:
    metadata:
      labels:
        app: web
    spec:
      containers:
        - name: web
          image: myapp:v2
          ports:
            - containerPort: 8080

spec:
  revisionHistoryLimit: 5  # 只保留最近 5 个历史版本

# 查看发布历史
kubectl rollout history deployment/web-app

# 回滚到上一个版本
kubectl rollout undo deployment/web-app

# 回滚到指定版本
kubectl rollout undo deployment/web-app --to-revision=3

# 观察滚动更新进度
kubectl rollout status deployment/web-app

apiVersion: v1
kind: Service
metadata:
  name: mysql-headless
spec:
  clusterIP: None  # Headless 模式,不分配虚拟 IP
  selector:
    app: mysql
  ports:
    - port: 3306

apiVersion: batch/v1
kind: Job
metadata:
  name: db-migrate
spec:
  completions: 1        # 需要成功完成 1 次
  backoffLimit: 3       # 最多重试 3 次
  template:
    spec:
      restartPolicy: Never  # Job 中只允许 Never 或 OnFailure
      containers:
        - name: migrate
          image: myapp:v2
          command: ["./migrate.sh"]

apiVersion: batch/v1
kind: CronJob
metadata:
  name: daily-backup
spec:
  schedule: "0 2 * * *"  # 分 时 日 月 周,每天 02:00 执行
  successfulJobsHistoryLimit: 3   # 保留 3 个成功记录
  failedJobsHistoryLimit: 1       # 保留 1 个失败记录
  jobTemplate:
    spec:
      template:
        spec:
          restartPolicy: OnFailure
          containers:
            - name: backup
              image: backup-tool:latest
              command: ["/backup.sh"]