[mrtg] Re: lockfile messages?

[Justin Shore]

At 3:58 PM -0500 3/21/00, Dan Swartzendruber wrote:
>>How big is that .cfg file you're running from cron?  How long does 
>>it take to complete its run?  How often do you run it from your 
>>crontab? Odds are that two different runs of MRTG are overlapping. 
>>Check the times that it mailed you against how long it takes to 
>>complete a run by hand.  You'll probably find out that its 
>>overlapping.  Each time MRTG runs with a certain .cfg it creates a 
>>lockfile for that .cfg so no two instances of MRTG will edit the 
>>log at the same time (race condition).  If one run takes so long to 
>>complete that it is still running when its called from cron again, 
>>MRTG will see that lockfile and bitch at you.  This could be caused 
>>by a slow device on in your .cfg or by having too many items in 
>>that .cfg.  If its the later, break it into smaller .cfgs and run 
>>it that way.
>
>i don't see how.  it is checking 3 interfaces on one router 
>(directly connected to me via ethernet),

Try simulating your cronjob by hand.  Set a timer and run exact 
command by hand every X # of minutes (which is another question you 
didn't answer) and see what happens.  Also, you never said how long 
it takes to complete by hand. ?  What about the times on the 
messages, are they sequential (every X # of minutes that you run MRTG 
on the cfg) without skipping a beat or are they only happening every 
so often?
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Justin Shore       K-State Linux Distro Mirror, Sysadmin
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<ftp://vinnie.ksu.ksu.edu/pub/mirror/linux>

*Internet2 Users*
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