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[[Main Page|Home]] > [[CentOS]] > [[CentOS 6.x]] > [[Monitoring tools]] > [[MRTG configuration]] > [[Using MRTG for monitoring host CPU, memory, disk etc.]]

'''Use of [[cacti]] is recommended over trying to use MRTG'''


First configure SNMP server on Linux host as explained at [[SNMP server configuration for Linux hosts]]. Then use following steps to monitor CPU, memory, disk etc.:

#Use following configuration file:
#:<pre>
#:: 
#:: #
#:: # File: /etc/mrtg/server-info.cfg
#:: #
#:: # Configuration file for non bandwidth server statistics
#:: #
#:: 
#:: #
#:: # Define global options
#:: #
#:: 
#:: LoadMIBs: /usr/share/snmp/mibs/UCD-SNMP-MIB.txt,/usr/share/snmp/mibs/TCP-MIB.txt
#:: workdir: /var/www/html/127.0.0.1-stats/
#:: 
#:: 
#:: #
#:: # CPU Monitoring
#:: # (Scaled so that the sum of all three values doesn't exceed 100)
#:: #
#:: 
#:: Target[server.cpu]:ssCpuRawUser.0&ssCpuRawUser.0:public@localhost + ssCpuRawSystem.0&ssCpuRawSystem.0:public@localhost + ssCpuRawNice.0&ssCpuRawNice.0:public@localhost
#:: Title[server.cpu]: Server CPU Load
#:: PageTop[server.cpu]: <h1>CPU Load - System, User and Nice Processes</h1>
#:: MaxBytes[server.cpu]: 100
#:: ShortLegend[server.cpu]: %
#:: YLegend[server.cpu]: CPU Utilization
#:: Legend1[server.cpu]: Current CPU percentage load
#:: LegendI[server.cpu]: Used
#:: LegendO[server.cpu]:
#:: Options[server.cpu]: growright,nopercent
#:: Unscaled[server.cpu]: ymwd
#:: 
#:: 
#:: #
#:: # Memory Monitoring (Total Versus Available Memory)
#:: #
#:: 
#:: Target[server.memory]: memAvailReal.0&memTotalReal.0:public@localhost
#:: Title[server.memory]: Free Memory
#:: PageTop[server.memory]: <h1>Free Memory</h1>
#:: MaxBytes[server.memory]: 100000000000
#:: ShortLegend[server.memory]: B
#:: YLegend[server.memory]: Bytes
#:: LegendI[server.memory]: Free
#:: LegendO[server.memory]: Total
#:: Legend1[server.memory]: Free memory, not including swap, in bytes
#:: Legend2[server.memory]: Total memory
#:: Options[server.memory]: gauge,growright,nopercent
#:: kMG[server.memory]: k,M,G,T,P,X
#:: 
#:: 
#:: #
#:: # Memory Monitoring (Percentage usage)
#:: #
#:: Title[server.mempercent]: Percentage Free Memory
#:: PageTop[server.mempercent]: <h1>Percentage Free Memory</h1>
#:: Target[server.mempercent]: ( memAvailReal.0&memAvailReal.0:public@localhost ) * 100 / ( memTotalReal.0&memTotalReal.0:public@localhost )
#:: options[server.mempercent]: growright,gauge,transparent,nopercent
#:: Unscaled[server.mempercent]: ymwd
#:: MaxBytes[server.mempercent]: 100
#:: YLegend[server.mempercent]: Memory %
#:: ShortLegend[server.mempercent]: Percent
#:: LegendI[server.mempercent]: Free
#:: LegendO[server.mempercent]: Free
#:: Legend1[server.mempercent]: Percentage Free Memory
#:: Legend2[server.mempercent]: Percentage Free Memory
#:: 
#:: 
#:: #
#:: # New TCP Connection Monitoring (per minute)
#:: #
#::  
#:: Target[server.newconns]: tcpPassiveOpens.0&tcpActiveOpens.0:public@localhost
#:: Title[server.newconns]: Newly Created TCP Connections
#:: PageTop[server.newconns]: <h1>New TCP Connections</h1>
#:: MaxBytes[server.newconns]: 10000000000
#:: ShortLegend[server.newconns]: c/s
#:: YLegend[server.newconns]: Conns / Min
#:: LegendI[server.newconns]: In
#:: LegendO[server.newconns]: Out
#:: Legend1[server.newconns]: New inbound connections
#:: Legend2[server.newconns]: New outbound connections
#:: Options[server.newconns]: growright,nopercent,perminute
#::  
#:: 
#:: #
#:: # Established TCP Connections
#:: #
#:: 
#:: Target[server.estabcons]: tcpCurrEstab.0&tcpCurrEstab.0:public@localhost
#:: Title[server.estabcons]: Currently Established TCP Connections
#:: PageTop[server.estabcons]: <h1>Established TCP Connections</h1>
#:: MaxBytes[server.estabcons]: 10000000000
#:: ShortLegend[server.estabcons]:
#:: YLegend[server.estabcons]: Connections
#:: LegendI[server.estabcons]: In
#:: LegendO[server.estabcons]:
#:: Legend1[server.estabcons]: Established connections
#:: Legend2[server.estabcons]:
#:: Options[server.estabcons]: growright,nopercent,gauge
#::  
#:: 
#:: #
#:: # Disk Usage Monitoring
#:: #
#:: 
#:: #Target[server.disk]: dskPercent.1&dskPercent.2:public@localhost
#:: #Title[server.disk]: Disk Partition Usage
#:: #PageTop[server.disk]: <h1>Disk Partition Usage /home and /var</h1>
#:: #MaxBytes[server.disk]: 100
#:: #ShortLegend[server.disk]: %
#:: #YLegend[server.disk]: Utilization
#:: #LegendI[server.disk]: /home
#:: #LegendO[server.disk]: /var
#:: #Options[server.disk]: gauge,growright,nopercent
#:: #Unscaled[server.disk]: ymwd
#:: 
#:</pre>
#:Replace localhost with 'server IP' and 'public' with community name. Also change workdir appropriately.
#Use command '<tt>env LANG=C /usr/bin/mrtg /etc/mrtg/127.0.0.1-stats.cfg</tt>' to collect statictics. Same command with '<tt>--logging</tt>' option can be used in crontab.
#Create index using '<tt>indexmaker --output=/var/www/html/127.0.0.1-stats/index.html /etc/mrtg/mrtg.cfg  /etc/mrtg/127.0.0.1-stats.cfg</tt>' command.


Note:
*This is not efficient way of using MRTG. We should use '<tt>rrdtool</tt>' to optimize MRTG when used for monitoring large number of hosts.
*Steps on using '<tt>rrdtool</tt>', monitoring disk partitions for free space and explanation of MRTG syntax are mentioned on link  http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch23_:_Advanced_MRTG_for_Linux and still need to be learned.



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