mrtg-squid - using mrtg to monitor Squid
Squid 2.3 knows SNMP and you can therefore use mrtg to monitor it quite easily.
I have made some modifications to mrtg which simplify this. My work is based on
earlier modification made by: firstname.lastname@example.org and email@example.com.
I added new code for displaying correct units to the previous patches
"perminute" and "perhour" ("option" tokens),
which allows other measurement in addition to "persecond".
Then I created a new option token "dorelpercent" which allows the
calculation of the percentage of IN-stream / OUT-stream on the fly and then
displays it on a fixed scale from 0% to 100%. For my requirements, this does
good work. Maybe someone wants a floating scale. It should not be a problem to
implement it, too (but give me an option to keep my fixed scale). If IN-stream
is always less than OUT-stream both lines (OUT-stream and relative percent)
are always displayed on top of IN-stream bulk. Otherwise this option makes no
sense. With this option you can display hitrates, errorrates (for router
monitoring: rel. droprates) easily now.
If you use this options please consider that you need a 5th colourname/value
pair in your Colours statements!
Due to some discussion on this list, I have implemented two tokens too:
"kilo" and "kMG"
"kilo" should contain the value of k (1000 or 1024), where 1000 is the
"kMG" is a comma separated list of multiplier prefixes, used instead
of "", "k", "M", "G", "T" on
the MRTG display. Leave the place free, if you want no prefix.
Also an incomplete list of OIDs for the new SQUID release is added.
You may need to turn on snmp_port in squid.conf to as it is disabled by default.
I hope you enjoy it.
First load the squid mib
You can measure responsetimes in ms and display it with MRTG correctly with:
You can display now MB/s as 1024*1024 B/s with:
Assuming you're not running squid's SNMP on the default snmp port, you need to
include a port number in your target line:
A sample config for squid:
Title[proxy-hit]: HTTP Hits
PageTop[proxy-hit]: <H2>proxy Cache Statistics: HTTP Hits / Requests</H2>
LegendI[proxy-hit]: HTTP hits
LegendO[proxy-hit]: HTTP requests
Legend1[proxy-hit]: HTTP hits
Legend2[proxy-hit]: HTTP requests
Options[proxy-hit]: nopercent, perminute, dorelpercent
Title[proxy-srvkbinout]: Cache Server Traffic In / Out
PageTop[proxy-srvkbinout]: <H2>Cache Statistics: Server traffic volume (In/Out) </H2>
LegendI[proxy-srvkbinout]: Traffic In
LegendO[proxy-srvkbinout]: Traffic Out
Legend1[proxy-srvkbinout]: Traffic In
Legend2[proxy-srvkbinout]: Traffic Out
YLegend[proxy-srvkbinout]: per minute
Options[proxy-srvkbinout]: nopercent, perminute
Andreas Papst <firstname.lastname@example.org> Dirk-Lueder Kreie
<email@example.com> Chris Chiappa <firstname.lastname@example.org>