安装 Docker

[root@localhost~]# yum install docker

启动 docker 服务

[root@localhost~]# systemctl start docker.service
[root@localhost~]# systemctl enable docker.service

安装 centos 镜像

[root@localhost~]# docker pull centos

    Using default tag: latest
    Trying to pull repository docker.io/library/centos ...

    latest: Pulling from docker.io/library/centos

    6bbedd9b76a4: Downloading 2.531 MB/49.87 MB

    fc19d60a83f1: Download complete

    de413bb911fd: Download complete

    2879a7ad3144: Download complete

    668604fde02e: Download complete

    668604fde02e: Pulling fs layer*

检查 centos 镜像安装状态

[root@localhost~]# docker images centos

REPOSITORY          TAG                IMAGE ID            CREATED            SIZE

docker.io/centos    latest              980e0e4c79ec        7 weeks ago         196.7 MB

运行一个新的容器

[root@localhost~]# docker  run -i -t centos /bin/bash
[root@bd1a482d44f5 /]#

参数解释
-i, --interactive               Keep STDIN open even if not attached

-t, --tty                            Allocate a pseudo-TTY


PS：“[root@bd1a482d44f5 /]#” 这行出现证明已进入容器

退出容器

[root@localhost~]# exit
exit