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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: and

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 default.
"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
 LoadMIBs: /usr/share/squid/mib.txt
You can measure responsetimes in ms and display it with MRTG correctly with:
 kMG[measure-ms]: m,,k,M,G,T
 short[measure-ms]: s
You can display now MB/s as 1024*1024 B/s with:
 kilo[volume]: 1024
Assuming you're not running squid's SNMP on the default snmp port, you need to include a port number in your target line:
 Target[proxy-hit]: cacheHttpHits&cacheProtoClientHttpRequests:public@localhost:3401
A sample config for squid:
 Target[proxy-hit]: cacheHttpHits&cacheProtoClientHttpRequests:public@proxy
 Title[proxy-hit]: HTTP Hits
 PageTop[proxy-hit]: <H2>proxy Cache Statistics: HTTP Hits / Requests</H2>
 Suppress[proxy-hit]: y
 LegendI[proxy-hit]:  HTTP hits
 LegendO[proxy-hit]:  HTTP requests
 Legend1[proxy-hit]:  HTTP hits
 Legend2[proxy-hit]:  HTTP requests
 YLegend[proxy-hit]: perminute
 ShortLegend[proxy-hit]: req/min
 Options[proxy-hit]: nopercent, perminute, dorelpercent
 Target[proxy-srvkbinout]: cacheServerInKb&cacheServerOutKb:public@proxy
 Title[proxy-srvkbinout]: Cache Server Traffic In / Out
 PageTop[proxy-srvkbinout]: <H2>Cache Statistics: Server traffic volume (In/Out) </H2>
 Suppress[proxy-srvkbinout]: y
 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
 ShortLegend[proxy-srvkbinout]: b/min
 kMG[proxy-srvkbinout]: k,M,G,T
 kilo[proxy-srvkbinout]: 1024
 Options[proxy-srvkbinout]: nopercent, perminute

Andreas Papst <> Dirk-Lueder Kreie <> Chris Chiappa <>
2012-01-12 2.17.4

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