Kubernetes Storage

参考文章：

https://kubernetes.io/docs/concepts/storage/volumes/

https://www.cnblogs.com/styshoo/p/6731425.html

容器中的磁盘文件是短暂的，这为在容器中运行重要的应用程序带来了一些问题。

第一 当容器崩溃时，Kubelet将会重启容器，这时候数据文件就会丢失。

第二 在同一个Pod中的容器通常需要共享数据。

Kubernetes使用Volume抽象解决了这两个问题。　　

Kubernetes supports several types of Volumes:

• awsElasticBlockStore
• azureDisk
• azureFile
• cephfs
• configMap
• csi
• downwardAPI
• emptyDir
• fc (fibre channel)
• flocker
• gcePersistentDisk
• gitRepo
• glusterfs
• hostPath
• iscsi
• local
• nfs
• persistentVolumeClaim
• projected
• portworxVolume
• quobyte
• rbd
• scaleIO
• secret
• storageos
• vsphereVolume

NFS PersistentVolume

前提条件：搭建NFS服务器，K8s node安装nfs客户端

pv-yaml

apiVersion: v1
kind: PersistentVolume
metadata:
  name: nginx-data
spec:
  capacity:
    storage: 1Gi
  accessModes:
    - ReadWriteMany
  nfs:
    path: /nfs-data
    server: 172.16.65.200
  persistentVolumeReclaimPolicy: Recycle

pvc-yaml

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: nginx-data
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 1Gi

deployment-yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-web
spec:
  replicas: 3
  selector:
    matchLabels:
      name: nginx-web
  template:
    metadata:
      labels:
        name: nginx-web
    spec:
      containers:
      - name: nginx-web
        image: nginx
        volumeMounts:
        - mountPath: /usr/share/nginx/html
          name: nginx-data
        ports:
        - containerPort: 80
      volumes:
      - name: nginx-data
        persistentVolumeClaim:
          claimName: nginx-data

service-yaml

apiVersion: v1
kind: Service
metadata:
  name: nginx-service
spec:
  selector:
    name: nginx-web
  type: NodePort
  ports:
  - port: 80
    protocol: TCP
    targetPort: 80
    name: http
    nodePort: 30080