一、volume

1、emptyDir
创建一个空卷，挂载到Pod中的容器。Pod删除该卷也会被删除。
应用场景：Pod中容器之间数据共享

apiVersion: v1
kind: Pod
metadata:
  name: my-pod
spec:
  containers:
  - name: write
    image: centos
    command: ["bash","-c","for i in {1..100};do echo $i >> /data/hello;sleep 1;done"]
    volumeMounts:
     - name: data
       mountPath: /data 
  - name: read
    image: centos
    command: ["bash","-c","tail -f /data/hello"]
    volumeMounts:
    - name: data
      mountPath: /data
  volumes:
  - name: data
    emptyDir: {}

kubectl logs my-pod -c read

2、hostPath
挂载Node文件系统上文件或者目录到Pod中的容器。
应用场景：Pod中容器需要访问宿主机文件,比如监控宿主机

apiVersion: v1
kind: Pod
metadata:
  name: my-pod
spec:
  containers:
  - name: busybox
    image: busybox
    args:
    - /bin/sh
    - -c
    - sleep 36000
    volumeMounts:
    - name: data
      mountPath: /data
  volumes:
  - name: data
    hostPath:
      path: /tmp
      type: Directory

3、网络存储（nfs）

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  selector:
    matchLabels:
      app: nginx  
spec:
  replicas: 3
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx
        volumeMounts:
        - name: wwwroot
          mountPath: /usr/share/nginx/html
        ports:
        - containerPort: 80
      volumes:
      - name: wwwroot
        nfs:
          server: 192.168.0.200
          path: /data/nfs

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