[SOLVED] script hangs when a remote server is down

vikas027 · 11-01-2007, 06:15 AM

Hi all,

I have made a script which logins to remote servers and fetches some data from it.
Is is working perfectly when all servers are reachable
BUT
my problem is -- if in case a server is down (or not reachable), the script hangs.

Is there some way, that the script just continues to ssh another server when a particular server is not responding say for 30 sec.

I am using ssh to login into servers and have used ssh-keygen command to bypass passwords.

Pls help, just finalizing the script.

Thanks in adv.

Regards,
Vikas

unSpawn · 11-01-2007, 12:43 PM

If ICMP is allowed you could 'ping -W 30 -c 1 servername || ssh anotherservername', if it doesn't maybe try 'ssh-keyscan -v -T 30 -t dsa servername >/dev/null 2>&1 || ssh anotherservername'? If that's not what you want maybe post the script?

chrism01 · 11-02-2007, 02:13 AM

Try here (specifically TimerOn) : http://tldp.org/LDP/abs/html/internalvariables.html

vikas027 · 11-06-2007, 10:26 AM

Hi all,

Thanks for your co-operation.

I was looking something like this :--

Quote:

ping -c 1 -w 180 192.168.1.4 1>/dev/null 2>/dev/null

This will wait for 3 mins, if the machine is up, it will return '0'.

Check the return state of the above command and run ssh it the return value is '0'.

Thanks to all.

Regards,
Vikas