k8s emptyDir-临时数据卷

emptyDir-临时数据卷

1. emptyDir-临时数据卷

• emptyDir卷：是一个临时存储卷，与Pod生命周期绑定一起，如果Pod删除了卷也会被删除。

• 应用场景：Pod中容器之间数据共享

• 示例：

  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: {}
  

  ​ 示例：Pod内容器之前共享数据

2. 案例

2.1 编写emptydir配置文件

[root@k8s-master yaml]# mkdir -p emptyDir
[root@k8s-master yaml]# cd emptyDir/
[root@k8s-master emptyDir]# ll
总用量 0

[root@k8s-master emptyDir]# vim emptydir.yaml
[root@k8s-master emptyDir]# cat emptydir.yaml
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: {}

2.2 启动配置文件

[root@k8s-master emptyDir]# kubectl apply -f emptydir.yaml 
pod/my-pod created

2.3 验证服务

[root@k8s-master emptyDir]# kubectl get pod 
NAME                 READY   STATUS    RESTARTS   AGE
configmap-demo-pod   1/1     Running   0          45h
my-pod               2/2     Running   3          10m
secret-demo-pod      1/1     Running   0          38h

2.4 进入服务验证数据

[root@k8s-master emptyDir]# kubectl exec -it my-pod -- /bin/bash
Defaulting container name to write.
Use 'kubectl describe pod/my-pod -n default' to see all of the containers in this pod.
[root@my-pod /]# ls -a /data/
.  ..  hello
[root@my-pod /]# cat /data/hello 
1
2
3
4
5
6
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8