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

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pvc-yaml

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

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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

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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

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