docker attach主要用来进入容器内部，之前创建了一个ubuntu的镜像，具体过程看之前的日志，现在进去瞅瞅
[root@localhost ~]# docker attach ubuntu root@7103a04f97d3:/# root@7103a04f97d3:/# ifconfig eth0 Link encap:Ethernet HWaddr 02:42:ac:11:00:02 inet addr:172.17.0.2 Bcast:172.17.255.255 Mask:255.255.0.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:22 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:2406 (2.4 KB) TX bytes:0 (0.0 B) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) root@7103a04f97d3:/# root@7103a04f97d3:/# pwd / root@7103a04f97d3:/# ll total 4 drwxr-xr-x. 1 root root 6 Jul 4 11:31 ./ drwxr-xr-x. 1 root root 6 Jul 4 11:31 ../ -rwxr-xr-x. 1 root root 0 Jul 4 11:31 .dockerenv* drwxr-xr-x. 2 root root 4096 May 15 01:25 bin/ drwxr-xr-x. 2 root root 6 Apr 10 2014 boot/ drwxr-xr-x. 5 root root 360 Jul 4 11:31 dev/ drwxr-xr-x. 1 root root 66 Jul 4 11:31 etc/ drwxr-xr-x. 2 root root 6 Apr 10 2014 home/ drwxr-xr-x. 12 root root 208 May 15 01:25 lib/ drwxr-xr-x. 2 root root 34 May 15 01:24 lib64/ drwxr-xr-x. 2 root root 6 May 15 01:23 media/ drwxr-xr-x. 2 root root 6 Apr 10 2014 mnt/ drwxr-xr-x. 2 root root 6 May 15 01:23 opt/ dr-xr-xr-x. 214 root root 0 Jul 4 11:31 proc/ drwx------. 2 root root 37 May 15 01:25 root/ drwxr-xr-x. 1 root root 21 May 15 21:21 run/ drwxr-xr-x. 1 root root 44 May 15 21:21 sbin/ drwxr-xr-x. 2 root root 6 May 15 01:23 srv/ dr-xr-xr-x. 13 root root 0 Apr 11 2018 sys/ drwxrwxrwt. 2 root root 6 May 15 01:25 tmp/ drwxr-xr-x. 1 root root 18 May 15 01:23 usr/ drwxr-xr-x. 1 root root 17 May 15 01:25 var/ root@7103a04f97d3:/# free -m total used free shared buffers cached Mem: 3935 3670 265 12 5 2024 -/+ buffers/cache: 1640 2295 Swap: 8191 0 8191
可以进去玩一玩，但是退出要注意：不能使用exit或者ctrl+c，这样的话，相当于把容器直接停止
要退出容器，应该使用ctrl+p，此时屏幕没反应，然后使用ctrl+q，就可以退出虚拟终端了，而且容器也在运行
root@7103a04f97d3:/# read escape sequence [root@localhost ~]# [root@localhost ~]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 7103a04f97d3 ubuntu:14.04 "/bin/bash" 22 minutes ago Up 22 minutes ubuntu
不过特别注意，官方并不推荐使用这个命令进入开启了交互模式的容器，即使加了-t，后台运行，也不推荐