06-14-2008
Script that Redirect SSH output via cron
Hi,
I have a script that's being called via a crontab which is a wrapper script that creates a log for the script that gets executed. Within the script that gets executed, it also run's subscripts. I've been able to get everything to work .. but the issue is one of the subscript that goes out and does a set of remote ssh connections to run a local script on servers, the output currently is being re-directed back to a file local to the system of execution, the problem is when the cron run's I know the output is being generated but it does not redirect to the local file. The file gets generated but they're all blank. I've tried to troubleshoot each script at a time and if I run the wrapper script manually, everything works, but when cron executes the script outputs these 0byte files.
I've tried:
ssh root@$i /tmp/subscript.sh >> /local/file
ssh -n root@$i /tmp/subscript.sh >> /local/file
ssh root@$i /tmp/subscript.sh &> /local/file
ssh root@$i /tmp/subscript.sh > /local/file 2>&1
I've tried many different method but I've just been left with manually running the wrapper script few times out of the day vs. having it automated.
I don't know how else I could troubleshoot or figure a way to re-direct the output from the remote ssh connection back to a local file that works under a crontab?? Any suggestions?
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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