CKA题目分享-第八篇-StatefulSets与Headless Services

运维栈记2025-12-16 9:17

配置StatefulSets，

复制代码

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: web
  labels:
    app: web
spec:
  serviceName: web # 关键：将StatefulSet与Headless Service关联，提供稳定的网络身份
  replicas: 2      
  selector:
    matchLabels:
      app: web
  template:
    metadata:
      labels:
        app: web
    spec:
      containers:
      - name: nginx
        image: nginx:alpine
        ports:
        - containerPort: 80
          name: http
        volumeMounts:
        - name: www
          mountPath: /usr/share/nginx/html # NGINX默认的web根目录
  # 关键：定义PersistentVolumeClaims (PVCs) 模板
  # StatefulSet将为每个Pod自动创建独立的PVC，并以 <volume-name>-<statefulset-name>-<ordinal-index> 命名
  volumeClaimTemplates:
  - metadata:
      name: www
    spec:
      accessModes: ["ReadWriteOnce"]
      resources:
        requests:
          storage: 1Gi
      storageClassName: standard

配置无头服务，

复制代码

apiVersion: v1
kind: Service
metadata:
  name: web
  labels:
    app: web
spec:
  ports:
  - port: 80
    name: http
    targetPort: 80
  clusterIP: None  # 关键：声明这是一个Headless Service，不分配Cluster IP
  selector:
    app: web

CKA题目分享-第二篇-存储

CKA题目分享-第五篇-Pod Security与Taints Tolerations

CKA题目分享-第六篇-CoreDNS与Helm