CentOS 6
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MRTG : Get Httpd Process Count2015/01/25
 
Configure MRTG to display httpd Processes count.
[1] Configure MRTG.
[root@dlp ~]#
vi /etc/snmp/snmpd.conf
# near line 205: add

proc httpd
[root@dlp ~]#
/etc/rc.d/init.d/snmpd restart

Stopping snmpd: [ OK ]
Starting snmpd: [ OK ]
[root@dlp ~]#
vi /etc/mrtg/mrtg.cfg
# add follows to the end (replace the "Serverworld" to your comunity name)

Target[httpd]: .1.3.6.1.4.1.2021.2.1.5.1&.1.3.6.1.4.1.2021.2.1.4.1:Serverworld@127.0.0.1
MaxBytes[httpd]: 50
Unscaled[httpd]: dwmy
Options[httpd]: gauge, growright, nopercent
YLegend[httpd]: Count
ShortLegend[httpd]: proc(s).
Title[httpd]: Httpd Processes
LegendI[httpd]: Processes
LegendO[httpd]:
Legend1[httpd]: Httpd Processes
Legend2[httpd]:
PageTop[httpd]: <h1>Httpd Processes</h1>
# execute mrtg 3 times (display warnings until 3 times)

[root@dlp ~]#
for (( i=1 ; i <= 3 ; i++ )); do env LANG=C mrtg /etc/mrtg/mrtg.cfg; done

2015-01-27 16:42:18, Rateup WARNING: /usr/bin/rateup could not read the primary log file for httpd
2015-01-27 16:42:18, Rateup WARNING: /usr/bin/rateup The backup log file for httpd was invalid as well
2015-01-27 16:42:18, Rateup WARNING: /usr/bin/rateup Can't remove httpd.old updating log file
2015-01-27 16:42:18, Rateup WARNING: /usr/bin/rateup Can't rename httpd.log to httpd.old updating log file
# generate index file

[root@dlp ~]#
indexmaker --columns=1 /etc/mrtg/mrtg.cfg > /var/www/mrtg/index.html
[2] Access to the "http://(MRTG hostname or IP address)/mrtg/" from a client with HTTP, then it's possible to see Httpd process count.
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