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waiting for ssh response for seconds

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# 1  
Old 12-09-2008
waiting for ssh response for seconds
Hi All,


I have to make an alert that'll wait for ssh response from the server for certain seconds, if no response is there in between it'll raise an alarm.

Havn't found any option for this yet, pls. help if anyone knows abt this. Any suggestion is welcome. Smilie



Best Regards,
VG
# 2  
Old 12-09-2008
Not sure if there is an SSH option for that, however, there is the 'netcat' utility, which you can connect to a certain post, and you can set a timeout.

For instance:

Code:
netcat -z -w <timeout in seconds> <host> <port>

So to check to see if ssh will respond withing 5 seconds, so the following:

Code:
netcat -z -w 5 host.example.com 22 || /bin/some_custom_alert

The '-z' option will make it disconnect as soon as it makes a connection to the port, and of course '-w' is to set the timeout in seconds.

If it does not connect, it will return a non-zero exit status, in which case, you would know to raise your alarm.

Hope this helps...
# 3  
Old 12-10-2008
nc solution above is good, if you want to consider ssh command, the option is
Quote:
-oConnectTimeout
, but to be sure check the man pages for your OS.
# 4  
Old 03-03-2009
Thanks for the solution . It works gr8. Smilie


Quote:
Originally Posted by Gee-Money
Not sure if there is an SSH option for that, however, there is the 'netcat' utility, which you can connect to a certain post, and you can set a timeout.

For instance:

Code:
netcat -z -w <timeout in seconds> <host> <port>

So to check to see if ssh will respond withing 5 seconds, so the following:

Code:
netcat -z -w 5 host.example.com 22 || /bin/some_custom_alert

The '-z' option will make it disconnect as soon as it makes a connection to the port, and of course '-w' is to set the timeout in seconds.

If it does not connect, it will return a non-zero exit status, in which case, you would know to raise your alarm.

Hope this helps...
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