docker 进入容器：

[root@localhost ~]#
[root@localhost ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
e40e729d2da2 centos:7 "/bin/bash" 18 hours ago Up 18 hours c7
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]# docker exec -ti c7 /bin/bash
[root@e40e729d2da2 /]#
[root@e40e729d2da2 /]#
[root@e40e729d2da2 /]#
[root@e40e729d2da2 /]#
exec 进入

启动并立刻进入到容器里

docker run --name c7 -it centos:7 /bin/bash

启动容器并放在后台运行加-d

docker run --name c7 -it -d centos:7 /bin/bash
docker ps
docker ps -q
查看所有的容器
docker ps -a
docker ps -aq

-i 交互式接收用户输入的命令-t 分配一个终端 /bin/bash: 一个新开窗口
[root@e40e729d2da2 /]#
[root@e40e729d2da2 /]#
[root@e40e729d2da2 /]# ps aux
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.0 0.0 11828 1048 pts/0 Ss+ 06:50 0:00 /bin/bash
root 29 0.0 0.1 11828 1896 pts/1 Ss 07:44 0:00 /bin/bash
root 43 0.0 0.0 51732 1700 pts/1 R+ 07:51 0:00 ps aux
[root@e40e729d2da2 /]#
[root@e40e729d2da2 /]#
[root@e40e729d2da2 /]#
[root@e40e729d2da2 /]# exit
exit
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
e40e729d2da2 centos:7 "/bin/bash" 18 hours ago Up 18 hours c7
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
e40e729d2da2 centos:7 "/bin/bash" 18 hours ago Up 18 hours c7
1f2abcd6ae16 centos:7 "/bin/bash" 18 hours ago Exited (0) 18 hours ago priceless_davinci
[root@localhost ~]#