On 12/20/10 8:16 AM, [email protected] wrote:
> Alternatively, could you recommend a good system/resource monitoring tool
> that would be able to let me know if nagios is down and restart it
> automatically?
>
Add a cronjob on a five (or whatever you're comfortable with) minute
interval, similar to:
#!/bin/bash
PATH=/bin:/usr/bin:/usr/local/bin
PID=`cat /home/nagios/nagios/var/nagios.lock`
PIDTEST=`kill -0 ${PID} 2>&1 >/dev/null`
if [ "${PIDTEST}" -eq "1" ]
then
rm /home/nagios/nagios/var/nagios.lock
# INSERT RESTART COMMAND HERE
echo "Killed Lockfile and restarted Nagios" | mail -s "Nagios
restart `hostname`" [email protected]
fi
>>>
Just be aware that it'll also trigger that if block, if nagios is
running under a different username. You can check for that by doing
some tests in the script with ps and grep.
> _____________________________________________
> From: Berg, Eric: IT (NYK)
> Sent: Monday, December 20, 2010 11:03 AM
> To: '[email protected]'
> Subject: Nagios kept from restarting after reboot by lock file
>
> Gee, this seems like an annoying newbie problem, but if Nagios crashes or is
> killed (as on system reboot), it leaves a lock file around that prevents it
> from starting again until the lock file is manually removed.
>
> I see this on Monday mornings after weekend reboots on a Red Hat Linux box:
>
> nagios: Lockfile '/home/nagios/nagios/var/nagios.lock' looks like its already
> held by another instance of Nagios (PID 0). Bailing out...
Sounds like something in the shutdown process is throwing a 0 into the
pid file, or the startup in the rc script is.
Either way, you should never have a 0 in there, either the rc script is
putting the wrong data in there, or it's reporting incorrectly.
> Does anyone know if there's a config option or something else that obviates
> the need to write a wrapper scropt to check to see if Nagios is really
> running and remove the lock file (look slike Nagios already knows it's not
> running by virtue of the value of the PID inthis very message!) so that it
> can cleanly start up again?
--
Mike Lindsey
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