At 10:45 AM 9/2/2008, ElihuJ wrote:
Hi all. I have a question about cron jobs that seem to be running to long or
with multiple copies of itself. For example, I have a backup script that I
run that seems to make multiple copies of itself. If I view the running
processes I see numerous instances of the same cron job. Is there something
I can do to limit this from happening? When it does, it drains my CPU and
some of my other processes are non responsive. Any help would be
appreciated. Thank you.
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For longer running jobs I do a couple things. I use a file to be sure only
one instance is running, but I also add signal handling. The following is
written for ksh, but can be adapted to sh if needed:
=============================================================
#!/usr/local/bin/ksh
# uncomment the following line for debugging
#set -x
RUNNING_FILE=RUNNING_FILE=/tmp/my_cronjob_running
LOGFILE=LOGFILE=/tmp/my_cronjob.log
[EMAIL PROTECTED]
MAIL=/usr/bin/mail
TOUCH=/usr/bin/touch
RM=/bin/rm
# Print an epilog string and clear the RUNNING_FILE
function epilog {
echo "We are all done scanning." >> $LOGFILE
$MAIL -s "MyCronjob Report" $SENDTO < $LOGFILE
if [ -f $RUNNING_FILE ]; then
$RM $RUNNING_FILE;
fi
}
function got_signal {
echo "Got a signal" >> $LOGFILE
epilog
exit
}
# Here pointers to signal handling subroutines are set
trap got_signal TERM HUP INT QUIT
if [ -f $RUNNING_FILE ]; then
echo "mycronjob is already running"
else
$TOUCH $RUNNING_FILE
$RM $LOGFILE
$TOUCH $LOGFILE
# add your job to be done here . . .
#
epilog
fi
=============================================================
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