Implementation method of SSH session replication function under Linux

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　　Detailed method

The code is as follows:

Linux/mac, add in $home/.ssh/config

Host *

Controlmaster Auto

Controlpath /tmp/ssh-%r@%h

So long as the first SSH login to enter the password, then the same hosts are exempt.

profile Analysis

Man ssh_config 5

Code is as follows:

Controlpath

Specify the path To the control socket used for connection sharing as described in the Controlmaster section

above or the string None "to disable Connection Sharing. In the path, '%l ' is substituted by the

Local host name, '%h ' would be substituted by the target host name, ' %p ' The port, and '%r ' by the remote

Login username. It is recommended so any controlpath used to opportunistic connection sharing include at

Least%h,%p, and%r. This is ensures that shared connections are uniquely identified.

%r to the remote machine's logon name

%h to remote machine name

principle Analysis

Strictly speaking, it is not really a session Copy, but rather a shared socket.

When you first log in, save the socket as a file to:/tmp/ssh-%r@%h This path

And when you log on, once you find the same host, reuse this socket

So once the main process forces the exit (Ctrl +C), other SSH is forced to quit.

You can see the debug information validation process

by ssh-v parameters Note

Some students say that the form of a certificate on Linux, you can achieve a login-free, yes.

Can be done completely for static passwords, and for dynamic passwords (the way passwords are), the above methods can be much easier.