kubernetes学习----存储卷

存储卷

docker可以使容器上的目录与节点上的目录做关联，达到持久性

• k8s集群的存储卷
  kubectl explain pods.spec.volumes 查看k8s支持的存储卷
• emptyDir

  ## pod-vol-demo.yaml
    apiVersion: v1
    kind: Pod
    metadata:
        name: pod-demo
        namespace: default
        labels:
            app:myapp
    spec:
        containers:
        - name: httpd
          image: busybox:latest
          imagePullPolicy: IfNotPresent
          command: ["/bin/httpd","-f","-h /data/web/html"]
          ports:
          -  name: http
             containerPort: 80
          volumeMounts:   ###存储卷挂载点说明
          - name: html   ##挂载存储卷名称
             mountPath: /data/web/html/   ##挂载路径
        - name: busybox
          image: busybox:latest
          imagePullPolicy: IfNotPresent
          volumeMounts:
          - name: html
            mountPath: /data/
          command:
          -  "/bin/sh"
          -  "-c"
          -  "while tre;do echo ${date} >> /data/index.html; sleep 2;done"
         volumes:
         - name: html
            emptyDir: {}   ## 存储卷类型的属性 ，映射键值使用磁盘空间,生命周期同pod，pod删除数据也删除了。         
            
  

  • hostPath

#pod-hostpath-vol.yaml
apiVersion: v1
kind: Pod
metadata:
    name: pod-vol-hostpath
    namespace: default
spec:
    containers:
    - name: myapp
      image: myapp:v1
      volumeMounts:
      - name: html
        mountPath: /usr/share/nginx/html
    volumes:
    - name: html
      hostPath:
        path: /data/pod/volumes1
        type: DirectoryOrCreate   ###不存在就创建

• nfs

apiVersion: v1
kind: Pod
metadata:
    name: pod-vol-nfs
    namespace: default
spec:
    containers:
    - name: myapp
      image: myapp:v1
      volumeMounts:
      - name: html
        mountPath: /usr/share/nginx/html
    volumes:
    - name: html
      nfs:
        path: /data/volumes   ##nfs 服务节点提供的目录
        server: nfs.server   ## 提供nfs服务的节点   

• pvc pv 架构
  
  
• 查看pvc使用方法：
  kubectl explain pods.spec.volumes.persistenVolumeClaim
  kubectl explain pvc
• 把nfs存储先定义为pv, pv属于集群级别资源，不能定义在名称空间中

#pv-demo.yaml
apiVersion: v1
kind: PersistentVolume
metadata；
    name: pv001
    labels:
      name: pv001
spec:
    nfs: 
      path: /data/volumes/v1
      server: nfs.server
    acdessModes: ["ReadWriteMany","ReadWriteOnce"] ##读写模型，多路只读，单路只读
    capacity:
        storage: 2Gi
---
apiVersion: v1
kind: PersistentVolume
metadata；
    name: pv002
    labels:
      name: pv002
spec:
    nfs: 
      path: /data/volumes/v2
      server: nfs.server
    acdessModes: ["ReadWriteMany","ReadWriteOnce"] ##读写模型，多路只读，单路只读
    capacity:
        storage: 5Gi
---
apiVersion: v1
kind: PersistentVolume
metadata；
    name: pv003
    labels:
      name: pv003
spec:
    nfs: 
      path: /data/volumes/v3
      server: nfs.server
    acdessModes: ["ReadWriteMany","ReadWriteOnce"] ##pv读写模型，多路只读，单路只读
    capacity:
        storage: 20Gi  ##pv指定大小

kubectl apply -f pv-demo.yaml
kubectl get pv
RECLAIM_POLICY 回收策略

• pvc 创建， 有名称空间和pod在同一个名称空间下

# pod-vol-pvc.yaml
apiVersion: v`
kind: PersistentVolumeClaim
metadata:
    name: mypvc
    namespace: default
spec:
    accessModes: ["ReadWriteMany"]  ##在pv的包含下
    resources:
      requests:    ###要求的存储空间，不能大于pv
      storage: 6Gi  ##大于6Gi的pv会自动绑定
---
apiVersion: v1
kind: Pod
metadata:
    name: pod-vol-pvc
    namespace: default
spec:
   containers:
   - name: myapp
     image: myspp:v1
     volumeMounts:
     - name: html
       mountPath: /usr/share/nginx/html/
   vulumes:
   - name: html
     persistentVolumeClaim:
       claimName: mypvc