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Full Discussion: Ssh remote command doesn't work from script file
Top Forums Shell Programming and Scripting Ssh remote command doesn't work from script file Post 302900915 by indianya on Friday 9th of May 2014 11:52:25 AM
Old 05-09-2014
Ssh remote command doesn't work from script file
I have 10 application servers in a distributed architecture generating their own application logs. Each server has application utility to continuously tail the log. for example following command follows tails and follows new logfiles as they are generated
Code:
server1$ logutility logtype

When I run the same command from using ssh from a terminal window on a remote server using a loop for all servers that also works fine

Code:
remoteserver $ for host in server1 server2 ..... server10
do
ssh $host "logutility logtype" >> logfile &
done

Above works fine as long as my terminal is open but stops when I close my terminal. So I put the above in an executable scriptfile to run with nohop option

Code:
#!/usr/bin/ksh
for host in server1 server2 ..... server10
do
ssh $host "logutility logtype" >> logfile &
done

and then I run the scriptfile as follows

Code:
remoteserver$ nohup scriptfile &

However, those ssh commands terminate immediately.

This is strange problem that I am unable to understand. Why does ssh command continue to run when run from terminal but terminates immediately when run from script. I would like help in understanding this behavior and also what needs to be done so that I can run that command remotely and save collective output of all 10 servers to a file on remoteserver.
Last edited by jim mcnamara; 05-09-2014 at 01:10 PM..
 

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LEARN ABOUT LINUX

ssh-keysign

SSH-KEYSIGN(8)						    BSD System Manager's Manual 					    SSH-KEYSIGN(8)

NAME

     ssh-keysign -- ssh helper program for host-based authentication

SYNOPSIS

     ssh-keysign

DESCRIPTION

     ssh-keysign is used by ssh(1) to access the local host keys and generate the digital signature required during host-based authentication with
     SSH protocol version 2.

     ssh-keysign is disabled by default and can only be enabled in the global client configuration file /etc/ssh/ssh_config by setting
     EnableSSHKeysign to ``yes''.

     ssh-keysign is not intended to be invoked by the user, but from ssh(1).  See ssh(1) and sshd(8) for more information about host-based authen-
     tication.

FILES

     /etc/ssh/ssh_config
	     Controls whether ssh-keysign is enabled.

     /etc/ssh/ssh_host_dsa_key
     /etc/ssh/ssh_host_ecdsa_key
     /etc/ssh/ssh_host_rsa_key
	     These files contain the private parts of the host keys used to generate the digital signature.  They should be owned by root, read-
	     able only by root, and not accessible to others.  Since they are readable only by root, ssh-keysign must be set-uid root if host-
	     based authentication is used.

     /etc/ssh/ssh_host_dsa_key-cert.pub
     /etc/ssh/ssh_host_ecdsa_key-cert.pub
     /etc/ssh/ssh_host_rsa_key-cert.pub
	     If these files exist they are assumed to contain public certificate information corresponding with the private keys above.

SEE ALSO

     ssh(1), ssh-keygen(1), ssh_config(5), sshd(8)

HISTORY

     ssh-keysign first appeared in OpenBSD 3.2.

AUTHORS

     Markus Friedl <markus@openbsd.org>

BSD
								  August 31, 2010							       BSD
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