CentOS 镜像没有运行？

Question

我下载了在后台作为守护进程执行的centos基础镜像，然后累了进不了终端，进不去。

我的主机是 Ubuntu 16.04。

以下是我执行的步骤：

主机操作系统版本 Ubuntu16.04

 root@jim-Ubuntu1504:/home/jim/web# lsb_release -a No LSB modules are
 available. Distributor ID: Ubuntu Description:    Ubuntu 16.04 LTS
 Release:        16.04 Codename:       xenial
 root@jim-Ubuntu1504:/home/jim/web#

通过以下命令启动docker

root@jim-Ubuntu1504:/home/jim/web# docker run -d --name=my_centos centos
Unable to find image 'centos:latest' locally
latest: Pulling from library/centos
a3ed95caeb02: Pull complete 
da71393503ec: Pull complete 
Digest: sha256:1a62cd7c773dd5c6cf08e2e28596f6fcc99bd97e38c9b324163e0da90ed27562
Status: Downloaded newer image for centos:latest
63f4b8fce1bd44253bb420436da3ad5b8f532b253fc9e74ff52ad1b2f9844251
root@jim-Ubuntu1504:/home/jim/web# docker exec -i -t my_centos bash
Error response from daemon: Container 63f4b8fce1bd44253bb420436da3ad5b8f532b253fc9e74ff52ad1b2f9844251 is not running

不知道为什么要退出

root@jim-Ubuntu1504:/home/jim/web# docker ps -a
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                      PORTS               NAMES
63f4b8fce1bd        centos              "/bin/bash"              18 minutes ago      Exited (0) 18 minutes ago                       my_centos
f0ca8b9f4fa5        nginx               "nginx -g 'daemon off"   23 minutes ago      Up 23 minutes               80/tcp, 443/tcp     my_nginxtemp
bb9ab4958c33        nginx               "nginx -g 'daemon off"   About an hour ago   Up About an hour            80/tcp, 443/tcp     boring_aryabhata
886d174f641d        nginx               "nginx -g 'daemon off"   2 hours ago         Up 2 hours                  80/tcp, 443/tcp     mad_fermat
root@jim-Ubuntu1504:/home/jim/web# 

启动了容器但不知道它为什么退出

root@jim-Ubuntu1504:/home/jim/web# docker start 63f4b8fce1bd
63f4b8fce1bd
root@jim-Ubuntu1504:/home/jim/web# docker ps -a
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                     PORTS               NAMES
63f4b8fce1bd        centos              "/bin/bash"              26 minutes ago      Exited (0) 2 seconds ago                       my_centos
f0ca8b9f4fa5        nginx               "nginx -g 'daemon off"   30 minutes ago      Up 30 minutes              80/tcp, 443/tcp     my_nginxtemp
bb9ab4958c33        nginx               "nginx -g 'daemon off"   About an hour ago   Up About an hour           80/tcp, 443/tcp     boring_aryabhata
886d174f641d        nginx               "nginx -g 'daemon off"   2 hours ago         Up 2 hours                 80/tcp, 443/tcp     mad_fermat
root@jim-Ubuntu1504:/home/jim/web# docker exec -i -t my_centos bash
Error response from daemon: Container 63f4b8fce1bd44253bb420436da3ad5b8f532b253fc9e74ff52ad1b2f9844251 is not running
root@jim-Ubuntu1504:/home/jim/web# 

PS: Can someone disable the restriction to post once every 90 mins ??? Learning has to be spontaneous and interactive.

Answer 1

您正在寻找centos在detached模式下运行的容器。尝试以下...

sudo docker run -d -it centos

Answer 2

如果你查看 CentOS 最新镜像的 Dockerfile，你会注意到最后一行：

CMD ["/bin/bash"]

因此，您启动了一个具有外壳的容器，它存在，仅此而已。

尝试：

docker run -it --name=my_centos centos sleep infinity

或任何变体。

顺便说一句，当你这样做时

root@jim-Ubuntu1504:/home/jim/web# docker exec -i -t my_centos bash

您假设您的容器正在运行，但这里没有运行。

检查：

docker ps -a --filter="name=my_centos"

您的容器已启动。