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NickSoft Linux Cookbook
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NickSoft
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Joined: 13 Nov 2006
Posts: 22
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 Posted: Wed Apr 18, 2007 10:40 pm Post subject: Monitor established TCP connections with mrtg |
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It's good to monitor established TCP connections. For example if you have web server and you see too many connections it means that you may have troubles with web spiders or spider like software for downloading whole sites. This doesn't always cost you more bandwidth, but it can overload apache server (or other web server software).
To monitor established connections you need started snmp daemon. For redhat based (or other yum enabled) OSs you can use yum to install net-snmp package:
| Code: | | yum install net-snmp |
Be carefull - on fedora core 5 net-snmp continuously consumes more memory. If you use FC 5 you should restart snmpd periodically. You can put this in your crontab:
0 6 * * * /sbin/service snmpd restart >/dev/null 2>/tmp/snmpd-restart-error.log
Configuration of snmpd is simple:
edit /etc/snmp/snmpd.conf (default location on most distros) and write this:
| Code: | | rocommunity public 127.0.0.1 |
Then enable the snmp daemon.
For redhat based distributions:
| Code: | chkconfig --level 345 snmpd on
service snmpd restart |
or just start it in your rc.local
here is example mrtg.cfg for monitoring tcp connections():
| Code: | # you may need to change paths.
HtmlDir: /var/www/mrtg
ImageDir: /var/www/mrtg
LogDir: /var/lib/mrtg
ThreshDir: /var/lib/mrtg
LoadMIBs: /usr/share/snmp/mibs/UCD-SNMP-MIB.txt,/usr/share/snmp/mibs/TCP-MIB.txt
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]: nopercent,gauge |
Then create indexes:
| Code: | | indexmaker /etc/mrtg/mrtg.cfg >/var/www/mrtg/index.html |
Start mrtg as daemon or in crontab (See mrtg howto) |
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