潇湘夜雨移动版

[root@zfb-jyhpt-bgcsjyh1 k8s]# cat  vol-emptydir.yaml

apiVersion: v1

kind: Pod

metadata:

  name: vol-emptydir-pod

spec:

  volumes:

  - name: html

    emptyDir: {}

  containers:

  - name: nginx

    image: nginx

    volumeMounts:

    - name: html

      mountPath: /usr/share/nginx/html

  - name: pagegen

    image: alpine

    volumeMounts:

    - name: html

      mountPath: /html

    command: ["/bin/sh","-c"]

    args:

    - while true; do

        echo $(hostname) $(date)>/html/index.html;

        sleep 10;

      done

  

[root@zfb-jyhpt-bgcsjyh1 k8s]# kubectl get pod vol-emptydir-pod  -o wide

NAME               READY   STATUS    RESTARTS   AGE     IP           NODE          NOMINATED NODE   READINESS GATES

vol-emptydir-pod   2/2     Running   0          2m51s   10.244.4.6   172.19.33.2   <none>           <none>

 

查看nginx

[root@zfb-jyhpt-bgcsjyh1 k8s]# kubectl logs -f vol-emptydir-pod nginx

/docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration

/docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/

/docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh

10-listen-on-ipv6-by-default.sh: Getting the checksum of /etc/nginx/conf.d/default.conf

10-listen-on-ipv6-by-default.sh: Enabled listen on IPv6 in /etc/nginx/conf.d/default.conf

/docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh

/docker-entrypoint.sh: Configuration complete; ready for start up

 

访问测试：

[root@zfb-jyhpt-bgcsjyh1 k8s]# curl 10.244.4.7

vol-emptydir-pod Wed Sep 23 15:06:12 UTC 2020

vol-emptydir-pod Wed Sep 23 15:06:22 UTC 2020

vol-emptydir-pod Wed Sep 23 15:06:32 UTC 2020

 

 

进入pagegen容器可以看到/html下的index.html文件正在追加内容：

[root@zfb-jyhpt-bgsygc1 ~]# docker exec -it ce783e87b94a /bin/sh

/ # lsbin    dev    etc    home   html   lib    media  mnt    opt    proc   root   run    sbin   srv    sys    tmp    usr    var

/ # ls html/index.html

/ # df -hFilesystem                Size      Used Available Use% Mounted on

overlay                  50.0G      6.2G     43.8G  12% /tmpfs                    64.0M         0     64.0M   0% /dev

tmpfs                     7.7G         0      7.7G   0% /sys/fs/cgroup/dev/mapper/centos-root

                         50.0G      6.2G     43.8G  12% /html

# tail -f /html/index.html

vol-emptydir-pod Wed Sep 23 15:12:22 UTC 2020

vol-emptydir-pod Wed Sep 23 15:12:32 UTC 2020

vol-emptydir-pod Wed Sep 23 15:12:42 UTC 2020

vol-emptydir-pod Wed Sep 23 15:12:52 UTC 2020

vol-emptydir-pod Wed Sep 23 15:13:02 UTC 2020

vol-emptydir-pod Wed Sep 23 15:13:12 UTC 2020

vol-emptydir-pod Wed Sep 23 15:13:22 UTC 2020

 

作为边车（ sidecar ）的 容器 paggen ，其每隔 10s钟将一行信息追加到存储卷上的

index.html 文件中，因此，通过主容器 nginx 的应用访问到的内容也会处于不停的变动中

外，emptyDir 储卷也可以基于 RAM 创建 tmpfs 件系统的存储卷，常用于为容器的应 (责任编辑：liangzh)