how to keepalive ssh connect with long duration command

[ZHANG Jiaqiang A]

Hi All,

 

I would like to know if there is anyway to keep the ssh connection alive while it execute some script remotely ?

 

If you're using SSH lib ? The remote server (or rounter) will disconnect any inactive conn before my script finish.

 

Best regards,

Zhang Jiaqiang

[Mathieu Bultel]

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Hi,

I have to launch some script shell on remote server too. I initialize the connection with the keyword "open connection" and "login". Then, I launch the script with the keyword "write". This keyword wirte the command and append a new line on the current channel. Then I use the keyword, "Read Until Prompt", in order to read the output of the command and return it in a variable.

If your script take long time, I advise you to set the timeout before write your command.

The sshlibrary is very simple to use, just have a look on the paramiko documentation for understand all the tricks : http://www.lag.net/paramiko/docs/paramiko.SSHClient-class.html

Best regards,
Mat.

[Tatu Aalto]

Ugh

I am assuming that you run this script on *nix platform.  If the script does not produce output, or one wants to redirect the output to a file, one could use the nohup[1] to start the script in the background. Wait and verify that it has finished the job and grab the result.

-Tatu
[1] http://en.wikipedia.org/wiki/Nohup

[ZHANG Jiaqiang A]

Hello,

 

Thanks for the answer. But I am still confused:

 

Imagine your remote *nix server will disconnect any idle client and terminating the session if no data has been received from client longer than 5 min. But your script on remote server will take 10 min to finish.

 

Can SSH lib deal with this scenario ?

(With putty client, there is an option "Sending of null packets to keep session active".)

 

Best regards,

Zhang Jiaqiang

---

From: robotframe...@googlegroups.com [mailto:robotframe...@googlegroups.com] On Behalf Of Mathieu Bultel
Sent: Wednesday, April 18, 2012 11:31 PM
To: robotframe...@googlegroups.com
Subject: Re: how to keepalive ssh connect with long duration command