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<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>I run primarily individual config files
with multiple cron jobs. Most of my configs run every minute.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>I use the sleep command within the cron to
stagger the time that each config runs. This spreads out the IO over the full
minute.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>E.G.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>* * * * * root sleep 15; /usr/bin/mrtg
/etc/mrtg/avail/Node1.cfg >& /dev/null<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>* * * * * root sleep 30; /usr/bin/mrtg
/etc/mrtg/avail/Node2.cfg >& /dev/null<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>* * * * * root sleep 45; /usr/bin/mrtg
/etc/mrtg/avail/Node3.cfg >& /dev/null <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>2-59/5 * * * * root /usr/bin/mrtg
/etc/mrtg/Node4.cfg >& /dev/null<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>3-59/5 * * * * root /usr/bin/mrtg
/etc/mrtg/Node5.cfg >& /dev/null<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>4-59/5 * * * * root /usr/bin/mrtg
/etc/mrtg/Node6.cfg >& /dev/null <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>I am polling several hundred nodes, some
with 200+ interfaces. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>The ones running every minute are a simple
mrtg-ping-probe config while the ones running every 5 minutes are a full blown
traffic poll on a switch stack.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>All this on a single 3.2GHz dual Xeon HP
server.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'><o:p> </o:p></span></font></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
Mersberger, Robert [mailto:robert.mersberger@goldenliving.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> April 17, 2008 10:12 AM<br>
<b><span style='font-weight:bold'>To:</span></b> Anson Rinesmith; Brad Lodgen;
mrtg@lists.oetiker.ch<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [mrtg] Large Master
Config Vulnerability</span></font><span lang=EN-US><o:p></o:p></span></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:blue'>I have all my configs in
one directory and run mrtg as a cron job with the following script.</span></font><span
lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:blue'>#! /bin/bash</span></font><span
lang=EN-US><o:p></o:p></span></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:blue'>for fn in
/etc/mrtg/*.cfg; do<br>
env LANG=C /usr/bin/mrtg
"$fn" &<br>
done</span></font><span lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:blue'>Maybe this will would for
you. I have been down the include route and I agree it does cause
problems.</span></font><span lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabIndex=-1>
</span></font></div>
<p class=MsoNormal style='margin-bottom:12.0pt'><b><font size=2 face=Tahoma><span
lang=EN-US style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
mrtg-bounces@lists.oetiker.ch [mailto:mrtg-bounces@lists.oetiker.ch] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Anson Rinesmith<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, April 17, 2008
11:47 AM<br>
<b><span style='font-weight:bold'>To:</span></b> 'Brad Lodgen';
mrtg@lists.oetiker.ch<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [mrtg] Large Master
Config Vulnerability</span></font><span lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'>You could always limit
the number of retries.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'>A second option is to
break up the master config file into other smaller files, and therefore when something
breaks only that smaller portion is broken and the rest of your polls proceed
without error.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabIndex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
mrtg-bounces@lists.oetiker.ch [mailto:mrtg-bounces@lists.oetiker.ch] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Brad Lodgen<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, April 17, 2008
11:39 AM<br>
<b><span style='font-weight:bold'>To:</span></b> mrtg@lists.oetiker.ch<br>
<b><span style='font-weight:bold'>Subject:</span></b> [mrtg] Large Master
Config Vulnerability</span></font><span lang=EN-US><o:p></o:p></span></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'>Hi everyone,<br>
<br>
I'm running a master config with hundreds of include lines and thousands of
targets. This type of setup is vulnerable to errors in config files and/or
changes made in the field not being immediately updated within the configs. If
there are a few errors or changes out in the field to ports causing them to
become 'unpollable', it causes the MRTG polling interval to go over five
minutes because it's retrying those interfaces. At the moment, with only about
30 error lines in my log(equating to about 15 interfaces/targets), it's causing
MRTG to take 7-9 minutes to complete polling. As this is a very small
percentage compared to the total amount of targets being polled, I'm trying to
figure out a way to get around this, if possible, or at least to minimize the
effects.<br>
<br>
Is anyone else running a system like this or does anyone have suggestions to
try?<br>
<br>
Thanks in advance for any help!<br>
Brad<o:p></o:p></span></font></p>
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