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README.md

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MRTG REMOTE SENSOR

Why?

because I lose too much time figuring out how to use complex snmpwalk/snmpget SNMP to get vital data like CPU usage, disk usage and other stuff in my MRTG reporting. I want something easy to install, easy to use, easy to understand. Like a URL with easy, readable parameters.

What

The MRTG sensor can be used to monitor a number of different variables. The PHP process will execute a PHP own command, or will run a bash command line to get the data. All these sensors are READ-ONLY. Never can a root-level (sudo) command be required to get the data.

  • cpu usage (uses the top command)
  • memory usage (uses the free command)
  • disk usage (uses the df command)
  • folder size in MB/GB(uses the du command)
  • file count/folder count (uses the lscommand)
  • (more to be added)

When?

  • the server you want to monitor should have a webserver that can run PHP
  • the web service can be called over a LAN ( 192.168.1.___/mrtg_sensor/ ) or over the internet ( www.example.com/mrtg_sensor/ )
  • the web service can obviously be called locally too ( localhost:8080/mrtg_sensor/ )

How?

  • install this folder on the server you want to monitor (eg server01)
  • in the MRTG config of your MRTG client (standard name: mrtg.cfg ), use curl to get the output of the script

An example:

Target[server01_disk1]: `curl -s "http://server01/mrtg_sensor/?key=cpu`
Title[server01_disk1]: SERVER01: CPU Usage
PageTop[server01_disk1]: < h1 >SERVER01: CPU Usage< /h1 >
LegendI[server01_disk1]: SERVER01: CPU Usage

the script will return with the standard 4 text lines that MRTG requires:

  1. value I
  2. value O (optional)
  3. uptime
  4. hostname

and will add some more lines (which are ignored by MRTG):

  1. the URL for configuring

or, when the URL for configuring is used

  1. the full MRTG to be used:
    • Target
    • Title
    • PageTop
    • Legend
    • ShortLegend
    • Options

Example:

85
62
1d, 12h 35 m
server01
http://server01/mrtg_sensor/?key=cpu