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Setting up SNMP and MRTG to monitor Network, CPU, Memory, Disk and Load Average

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This section / article will cover the SNMP (ver1) and MRTG configurations.

Install necessary packages:

 

yum -y install mrtg net-snmp net-snmp-perl net-snmp-utils

 

Edit snmpd.conf file to setup community strings and other monitors:-

 

[root@www mrtg]# vi /etc/snmp/snmpd.conf

com2sec notConfigUser default snmpsecret

group notConfigGroup v1 notConfigUser

view roview included .1

access notConfigGroup "" any noauth exact roview rwview none

syslocation SomewhereintheWorld

syscontact Root < This e-mail address is being protected from spambots. You need JavaScript enabled to view it >

disk /

load 12 14 14

pass .1.3.6.1.4.1.4413.4.1 /usr/bin/ucd5820stat

[root@www mrtg]#

 

service snmpd restart

chkconfig --level 35 snmpd on

 

Create MRTG configuration file and manually edit it. Make sure to include extra (required) MIBs, using the LoadMIBs directive:-

 

[root@www mrtg]# /usr/bin/cfgmaker --global 'Options[_]: growright, bits,  unknaszero' --ifref=ip \

--ifdesc=descr --noreversedns --global 'WorkDir: /var/www/mrtg' \

--output=/etc/mrtg/mrtg.cfg snmpsecret@localhost

[root@www mrtg]# vi /etc/mrtg/mrtg.cfg

EnableIPv6: no

Options[_]: growright, bits, unknaszero

WorkDir: /var/www/mrtg


Target[localhost_10.1.2.3]: /10.1.2.3:snmpsecret@localhost:

SetEnv[localhost_10.1.2.3]: MRTG_INT_IP="10.1.2.3" MRTG_INT_DESCR="eth0"

MaxBytes[localhost_10.1.2.3]: 1250000

Title[localhost_10.1.2.3]: eth0 -- www.example.com

PageTop[localhost_10.1.2.3]: <h1>eth0 -- www.example.com</h1>

<div id="sysdetails">

<table>

...

[output snipped]

...

</table>

</div>


LoadMIBs: /usr/share/snmp/mibs/UCD-SNMP-MIB.txt, /usr/share/snmp/mibs/TCP_MIB.txt, /usr/share/snmp/mibs/HOST-RESOURCES-MIB.txt


Target[EXAMPLE_root]:dskPercent.1&dskPercent.1:snmpsecret@localhost

MaxBytes[EXAMPLE_root]: 100

Title[EXAMPLE_root]: DISK USAGE - /

PageTop[EXAMPLE_root]: <h1>DISK Usage in % (/)</h1>

Unscaled[EXAMPLE_root]: ymwd

ShortLegend[EXAMPLE_root]: %

YLegend[EXAMPLE_root]: DISK Utilization

Legend1[EXAMPLE_root]: /:

Legend2[EXAMPLE_root]: /:

Legend3[EXAMPLE_root]:

Legend4[EXAMPLE_root]:

LegendI[EXAMPLE_root]: /:

LegendO[EXAMPLE_root]: /:

Options[EXAMPLE_root]: growright, unknaszero, gauge,nopercent


Target[EXAMPLE_loadavg]: laLoad.2&laLoad.3:snmpsecret@localhost

MaxBytes[EXAMPLE_loadavg]: 5000

Title[EXAMPLE_loadavg]: Load Average

PageTop[EXAMPLE_loadavg]: <h1>Load Average</h1>

YLegend[EXAMPLE_loadavg]: Load Average

ShortLegend[EXAMPLE_loadavg]:

Legend1[EXAMPLE_loadavg]: Load average 5 min

Legend2[EXAMPLE_loadavg]: Load average 15 min

LegendI[EXAMPLE_loadavg]: 5min load avg

LegendO[EXAMPLE_loadavg]: 15min load avg

Options[EXAMPLE_loadavg]: nopercent,growright,noinfo,gauge, unknaszero



Target[EXAMPLE_memory]: memTotalReal.0&memAvailReal.0:snmpsecret@localhost

Options[EXAMPLE_memory]: nopercent,growright,gauge,noinfo, unknaszero

Title[EXAMPLE_memory]: Free Memory

PageTop[EXAMPLE_memory]: <H1>Free Memory</H1>

MaxBytes[EXAMPLE_memory]: 2147483648

YLegend[EXAMPLE_memory]: bytes

ShortLegend[EXAMPLE_memory]: bytes

kMG[EXAMPLE_memory]: k,M

Legend1[EXAMPLE_memory]: Total Physical Memory

Legend2[EXAMPLE_memory]: Free Physical Memory

LegendI[EXAMPLE_memory]: Total Memory

LegendO[EXAMPLE_memory]: Free Memory

Target[cpusum]:ssCpuRawUser.0&ssCpuRawUser.0:snmpsecret@localhost + ssCpuRawSystem.0&ssCpuRawSystem.0:
snmpsecret@localhost + ssCpuRawNice.0&ssCpuRawNice.0:snmpsecret@localhost
MaxBytes[cpusum]: 100
Title[cpusum]: CPU Usage % (User+System+Nice)
PageTop[cpusum]: <H1>CPU Usage % (User+System+Nice)</H1>
ShortLegend[cpusum]: %
YLegend[cpusum]: CPU Usage
Legend1[cpusum]: CPU usage in %
Legend2[cpusum]:
Legend3[cpusum]:
Legend4[cpusum]:
LegendI[cpusum]:  Active
LegendO[cpusum]:
Options[cpusum]: growright,nopercent, unknaszero


[root@www mrtg]#

 

Create index pages:-

 

[root@www mrtg]# indexmaker --title="EXAMPLE server stats" --output=/var/www/mrtg/index.html /etc/mrtg/mrtg.cfg

 

Run the following three times to generate data files:-

[root@www mrtg]# LANG=C LC_ALL=C /usr/bin/mrtg /etc/mrtg/mrtg.cfg --lock-file /var/lock/mrtg/mrtg_l --confcache-file /var/lib/mrtg/mrtg.ok

 

That's all. Try accessing the mrtg page by using: http://www.example.com/mrtg

The cron job for mrtg is already setup my mrtg RPM.

 

 

Regards,

Kamran

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