MRTG can monitor almost anything as long as you can make a script that can output four lines.

1. First data
2. Second data
3. Uptime
4. Hostname

If your MRTG is on the same server you are monitoring, its easy. If not, find a way to for the script to query the target host through tcp/udp.

Your mrtg config should look like this.

Target[prepost]: `/usr/bin/prepost.pl`
Directory[prepost]: prepost
MaxBytes[prepost]: 48
Title[prepost]: Prepaid / Postpaid
PageTop[prepost]: <H1>Prepaid / Postpaid</H1>
Options[prepost]: gauge, absolute, growright, nopercent, unknaszero
YLegend[prepost]: Users
ShortLegend[prepost]: Users
Legend1[prepost]: Prepaid
Legend2[prepost]: Postpaid
#Legend3[prepost]: b
#Legend4[prepost]: c
LegendI[prepost]: Users
LegendO[prepost]: Users
#Colours[prepost]: BLUE#0000ff,GREEN#00eb0c,GRAY#AAAAAA,VIOLET#ff00ff
WithPeak[prepost]: ymw


John
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