526互联

K8S statefulset 有状态服务部署应用-2

发布时间 2023-11-21 16:45:13作者: 属于我的梦，明明还在

 StatefulSet详解
kubectl explain sts.spec ：主要字段解释
replicas ：副本数
selector：那个pod是由自己管理的
serviceName：必须关联到一个无头服务商
template：定义pod模板（其中定义关联那个存储卷）
volumeClaimTemplates ：生成PVC

创建pv,pvc

cat web-pv.yaml 
# mkdir -p /nfs_dir/{web-pv0,web-pv1}
apiVersion: v1
kind: PersistentVolume
metadata:
  name: web-pv0
  labels:
    type: web-pv0
spec:
  capacity:
    storage: 1Gi
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  storageClassName: my-storage-class
  nfs:
    path: /nfs_dir/web-pv0
    server: 10.0.1.201
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: web-pv1
  labels:
    type: web-pv1
spec:
  capacity:
    storage: 1Gi
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  storageClassName: my-storage-class
  nfs:
    path: /nfs_dir/web-pv1
    server: 10.0.1.201
创建pvc(这一步可以省去让其自动创建，这里手动创建是为了让大家能更清楚在sts里面pvc的创建过程)
cat web-pvc.yaml 
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: www-web-0
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi
  storageClassName: my-storage-class
  selector:
    matchLabels:
      type: web-pv0
---
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: www-web-1
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi
  storageClassName: my-storage-class
  selector:
    matchLabels:
      type: web-pv1
创建Service 和 StatefulSet
 cat web.yaml 
apiVersion: v1
kind: Service
metadata:
  name: web-headless
  labels:
    app: nginx
spec:
  ports:
  - port: 80
    name: web
  clusterIP: None
  selector:
    app: nginx
---

apiVersion: v1
kind: Service
metadata:
  name: web
  labels:
    app: nginx
spec:
  ports:
  - port: 80
    name: web
  selector:
    app: nginx

---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: web
spec:
  selector:
    matchLabels:
      app: nginx # has to match .spec.template.metadata.labels
  serviceName: "nginx"
  replicas: 2 # by default is 1
  template:
    metadata:
      labels:
        app: nginx # has to match .spec.selector.matchLabels
    spec:
      terminationGracePeriodSeconds: 10
      containers:
      - name: nginx
        image: nginx
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 80
          name: web
        volumeMounts:
        - name: www
          mountPath: /usr/share/nginx/html
  volumeClaimTemplates:
  - metadata:
      name: www
    spec:
      accessModes: [ "ReadWriteOnce" ]
      storageClassName: "my-storage-class"
      resources:
        requests:
          storage: 1Gi