emptyDir-臨時資料卷

1. emptyDir-臨時資料卷

• emptyDir卷：是一個臨時儲存卷，與Pod生命週期繫結一起，如果Pod刪除了卷也會被刪除。

• 應用場景：Pod中容器之間資料共享

• 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內容器之前共享資料

2. 案例

2.1 編寫emptydir配置檔案

[root@k8s-master yaml]# mkdir -p emptyDir
[root@k8s-master yaml]# cd emptyDir/
[root@k8s-master emptyDir]# ll
總用量 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 啟動配置檔案

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

2.3 驗證服務

[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 進入服務驗證資料

[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
7
8