05-09-2008
Multiple crontab entries crashing server
Hi all
I have a problem where having multiple simultaneous startups in the crontab causes the entire server (running RHEL-AS3). Three process are set to be fired off at the same minute. Individually, they all start fine. As soon as they start via these cron jobs, the server halts. Doesn't turn off, but it does lose all network connectivity, terminals and other interactivity.
Any idea if this is a known fault? The workaround is easy enough - spread the processes' startups over several minutes. But I'm curious how these innocent binaries can cause so much havoc. They're not running as root and not filling the drive or anything.
Also, when a box is in this state (no output on video interfaces, apparently not responding to any normal input, no response to ping or other network requests), is there any diagnosis steps that can be taken to restore it other than a hard reset? What is it likely to be doing?
Cheers!
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LEARN ABOUT DEBIAN
bcrontab
bcrontab(1) General Commands Manual bcrontab(1)
NAME
bcrontab - Manage users crontab files
SYNOPSIS
bcrontab [ -u user ] file
bcrontab [ -u user ] { -l | -r | -e }
DESCRIPTION
bcrontab interfaces with the bcron-spool daemon to manage crontab files in the privileged spool directory.
OPTIONS
-u user
Tell bcron-spool that we are acting on behalf of the named user. bcron-spool will only accept the username if bcrontab is running
as either root or the same user ID as the named user.
-l List the cronab crontab to standard output.
-r Remove the user's crontab.
-e Edit the current crontab.
ENVIRONMENT
VISUAL If this is set, it is used as the editor to invoke to edit a crontab.
EDITOR If $VISUAL is not set and this is, it is used as the editor to invoke to edit a crontab. If neither are set, /bin/vi is used.
BCRON_SOCKET
The path to the named socket used to communicate with bcron-spool. Defaults to /var/run/bcron-spool.
LOGNAME
USER These two variables are used, in order, to determine the user name invoking the program. One must be set if the -u option is not
used.
FILES
bcrontab tries to writes a temporary file into the current directory, and then into /tmp if that fails, in order to edit the current
crontab.
SEE ALSO
bcron-spool(8), crontab(5)
AUTHOR
Bruce Guenter <bruceg@em.ca>
bcrontab(1)