kubernetes StatefulSet 有状态服务

- 日理万妓 2022-02-13 01:47 152阅读 0赞

官方文档: [https://kubernetes.io/docs/tutorials/stateful-application/basic-stateful-set/][https_kubernetes.io_docs_tutorials_stateful-application_basic-stateful-set]

<table> 
 <thead> 
  <tr> 
   <th>服务类型</th> 
   <th>服务</th> 
   <th>应用场景</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>无状态服务</td> 
   <td>deployment</td> 
   <td>web服务</td> 
  </tr> 
  <tr> 
   <td>有状态服务</td> 
   <td>StatefulSet</td> 
   <td>mysql、redis等</td> 
  </tr> 
 </tbody> 
</table>

创建StatefulSet

apiVersion: v1
    kind: Service
    metadata:
      name: nginx
      labels:
        app: nginx
    spec:
      ports:
      - port: 80
        name: web
      clusterIP: None
      selector:
        app: nginx
    ---
    apiVersion: apps/v1
    kind: StatefulSet
    metadata:
      name: web
    spec:
      serviceName: "nginx"
      replicas: 2
      selector:
        matchLabels:
          app: nginx
      template:
        metadata:
          labels:
            app: nginx
        spec:
          containers:
          - name: nginx
            image: k8s.gcr.io/nginx-slim:0.8
            ports:
            - containerPort: 80
              name: web
            volumeMounts:
            - name: www
              mountPath: /usr/share/nginx/html
      volumeClaimTemplates:
      - metadata:
          name: www
        spec:
          accessModes: [ "ReadWriteOnce" ]
          resources:
            requests:
              storage: 1Gi

StatefulSet错误排查

Events:
      Type     Reason            Age                  From               Message
      ----     ------            ----                 ----               -------
      Warning  FailedScheduling  10s (x4 over 2m27s)  default-scheduler  pod has unbound immediate PersistentVolumeClaims
    
    #查看pv的名字
    kubectl get pv,pvc,pod
    
    #查看具体错误
    kubectl describe persistentvolumeclaim/www-web-0
    
    Events:
      Type       Reason         Age                  From                         Message
      ----       ------         ----                 ----                         -------
      Normal     FailedBinding  49s (x263 over 65m)  persistentvolume-controller  no persistent volumes available for this claim and no storage class is set

StatefulSet如何管理pods  
删除StatefulSet  
扩缩容StatefulSet  
升级StatefulSet的pod

[https_kubernetes.io_docs_tutorials_stateful-application_basic-stateful-set]: https://kubernetes.io/docs/tutorials/stateful-application/basic-stateful-set/