zabbix and the daemon tools

[ghislain]

Hi,

I allready had some discution here about the way zabbix_server start. HHere is the problem i meet, perhaps some of you can help me


I tried to tweak the scripts and use the daemon tool supervise with zabbix. In all case i meet a problem. It seems that zabbix just start his process and fork a new one leaving the started one so supervise cannot restart it in case of failure.

The daemon tools have for this case a hack that we see here :

How can I supervise a daemon that puts itself into the background? When I run inetd, my shell script exits immediately, so supervise keeps trying to restart it.

Answer: The best answer is to fix the daemon. Having every daemon put itself into the background is bad software design.

fghack can force some daemons to run in the foreground:

#!/bin/sh
echo starting
exec fghack inetd
Beware that supervise cannot send signals to daemons under fghack.


But fghack does not work for zabbix.

I was wondering if there was an option to the command line to prevent zabbix to go in foreground or anything like that in the configuration file. Anyone made this work ? I'de like to have supervise restart the daemon in case of failure

regards,
Ghislain.

[fonderia]

quite rude, but effective.

# cat /service/monitoring_agent/run 
#!/bin/sh
#pkill -9 zabbix_agentd
ps waxu|grep /usr/sbin/zabbix_agentd|grep -vq grep
RES=$?
if [[ -f /var/run/zabbix/zabbix_agentd.pid && $RES -eq 0 ]]
then
        exit
else
        rm -rf /var/run/zabbix/zabbix_agentd.pid
        killall -9 zabbix_agentd 2>/dev/null
        exec /usr/sbin/zabbix_agentd 2>&1
fi

[ghislain]

yes quite hard

thanks for sharing. Alexei what is your point of view on this ? Will it be difficult to prevent the forking or is it silly to ask ? (sorry i am not a dev so i really miss the knowledge to know if this is good/bad/neutral...

If not i will use this solution but as we see this is rather the "hard" way

Thanks again.
Ghislain.

ps: by the way the trigger and template in beta5 are really easy to work with, thanks !

[SATux]

Ghislain,

Did you ever get zabbix_server to work nicely with daemontools?

Thanks
SATux

[ghislain]

in fact no. I used a third party monitoring services to monitor zabbix and the support team get paged if it dies. So i basicaly use it in a normal way

regards,
Ghislain.

[johnnyirons]

this is better.
you can reuse it for the agent, you change $PROC.

(freebsd 6.2)

#!/usr/local/bin/bash

PROC=zabbix_server

ps waxu|grep $PROC|grep "main process"
if [[ $? -gt 0 ]]; then
        if [[ -f /var/run/zabbix/$PROC.pid  ]]; then
                echo "Found stale lock file, killing... "|logger -t $PROC
                rm -rf /var/run/zabbix/$PROC.pid
        fi
        killall  $PROC 2>/dev/null
        sleep 5
        ps waxu|grep $PROC|grep "main process"
        RES=$?
        if [ $? -gt 0 ]; then
                echo "Brute force killing $PROC (-9).. "|logger -t $PROC
                killall -9 $PROC 2>/dev/null
        fi
        sleep 5
        exec /usr/local/bin/$PROC 2>&1 &
        sleep 5
        ps waxu|grep $PROC|grep "main process"
        if [[ $? -gt 0 ]]; then
                echo "Did not start!!! Check $PROC.log."|logger -t $PROC
        else
                echo "started."|logger -t $PROC
        fi
fi