1. 11.1 Kubernetes Volume

在Docker的相关章节，我们讲解了Docker Volume，可以挂载一个目录到Docker容器中，在Kubernetes中也有Volume的组建，Volume不是单独存在的，你不能单独创建一个Volume的资源对象，需要 在Pod中进行定义，Volume的生命周期和Pod一样，但是比Pod里面的容易要长。

1.1. emptyDir卷

[root@linux-node1 ~]# cat nginx-volume-empty.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.13.12
        ports:
        - containerPort: 80
        volumeMounts:
        - mountPath: /cache
          name: cache-volume
       volumes:
        - name: cache-volume
          emptyDir: {}

1.2. HostPath卷

[root@linux-node1 ~]# cat nginx-volume-hostpath.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.13.12
        ports:
        - containerPort: 80
        volumeMounts:
        - mountPath: /cache
          name: log-volume
       volumes:
        - name: log-volume
          hostPath:
            path: /opt
            type: Directory