Docker attach命令具有什么功能呢?

docker attach功能:
    连接到正在运行中的容器

docker attach命令语法

docker attach [OPTIONS] CONTAINER

option参数说明
–detach-keys:指定退出attach模式的快捷键序列，默认是 CTRL-p
–no-stdin:是否挂你标准输入，默认是打开
–sig-proxy:是否代理收到的系统信号给应用进程，默认为true

注意事项:
    1.连接的容器需处于运行状态
	2.attach连接容器后,可使用ctrl-c终止连接
	3.attach连接容器与容器共享屏幕
	4.按ctrl+c 可能会终止正在运行的容器

[root@node0 ~]# docker run -d --name centostest centos /usr/bin/top -b
53a2d3182d4b356b257c9ffe47e6154e74ad0e658240805d8cbe7c9f48b03e39
[root@node0 ~]# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
53a2d3182d4b        centos              "/usr/bin/top -b"   4 seconds ago       Up 3 seconds                            centostest
[root@node0 ~]# docker attach 53


top - 23:17:38 up 3 days,  5:10,  0 users,  load average: 0.22, 0.14, 0.09
Tasks:   1 total,   1 running,   0 sleeping,   0 stopped,   0 zombie
%Cpu(s):  1.0 us,  1.0 sy,  0.0 ni, 98.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
MiB Mem :   3770.8 total,   1678.9 free,    565.1 used,   1526.7 buff/cache
MiB Swap:   2048.0 total,   2048.0 free,      0.0 used.   2849.2 avail Mem 

   PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND
     1 root      20   0   48980   2024   1484 R   0.0   0.1   0:00.03 top

top - 23:17:41 up 3 days,  5:10,  0 users,  load average: 0.20, 0.14, 0.09
Tasks:   1 total,   1 running,   0 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.3 us,  0.3 sy,  0.0 ni, 99.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
MiB Mem :   3770.8 total,   1678.8 free,    565.3 used,   1526.7 buff/cache
MiB Swap:   2048.0 total,   2048.0 free,      0.0 used.   2849.1 avail Mem