Bash脚本设置临时SSH隧道 [英] Bash script to set up a temporary SSH tunnel

问题描述

在Cygwin上，我希望Bash脚本能够:

On Cygwin, I want a Bash script to:

1. 创建到远程服务器的SSH隧道.
2. 在本地使用隧道进行一些工作.
3. 然后关闭隧道.

关机部分让我感到困惑.

The shutdown part has me perplexed.

目前，我有一个me脚的解决方案.在一个shell中，我运行以下命令来创建隧道:

Currently, I have a lame solution. In one shell I run the following to create a tunnel:

# Create the tunnel - this works! It runs forever, until the shell is quit.
ssh -nNT -L 50000:localhost:3306 [e-mail]

然后，在另一个shell窗口中，我完成工作:

Then, in another shell window, I do my work:

# Do some MySQL stuff over local port 50000 (which goes to remote port 3306)

最后，完成后，我关闭第一个外壳窗口以杀死隧道.

Finally, when I am done, I close the first shell window to kill the tunnel.

我想在一个脚本中完成所有操作，例如:

I'd like to do this all in one script like:

# Create tunnel
# Do work
# Kill tunnel

我如何跟踪隧道过程，所以我知道要杀死哪一个?

How do I keep track of the tunnel process, so I know which one to kill?

推荐答案

您可以使用ssh控制套接字"轻松地做到这一点.要与已经在运行的SSH进程进行对话并获取它的pid，请杀死它，等等.请使用控制套接字"(-M用于主服务器，-S用于套接字)，如下所示:

You can do this cleanly with an ssh 'control socket'. To talk to an already-running SSH process and get it's pid, kill it etc. Use the 'control socket' (-M for master and -S for socket) as follows:

$ ssh -M -S my-ctrl-socket -fnNT -L 50000:localhost:3306 [e-mail]
$ ssh -S my-ctrl-socket -O check [e-mail]
Master running (pid=3517) 
$ ssh -S my-ctrl-socket -O exit [e-mail]
Exit request sent. 

请注意，my-ctrl-socket将是创建的实际文件.

Note that my-ctrl-socket will be an actual file that is created.

我从在OpenSSH邮件列表中收到了非常RTFM的回复.

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