How-To MRTG bandwidth monitoring utility

**wpte** · 05-03-2010, 15:46

Originally Posted by andrewak

Can't find .html files. In the specified directory appeared three files:

mrtg-l.png
mrtg-m.png
mrtg-r.png

and no one .html

In /opt/etc/mrtg.cfg (which was left 'as-is' after creation) have two uncommented interfaces - eth0, eth1

Processes snmpd and mrtg are running.

Any sudgessions how to check what's wrong?

May be I've not installed some additional libraryes? Can you paste here output of 'ipkg list_installed' from your router?

hmm, are you sure mrtg has enough rights to write to that directory?
how long did you wait before checking? it might take 5 minutes

**andrewak** · 05-03-2010, 16:18

Originally Posted by wpte

hmm, are you sure mrtg has enough rights to write to that directory?

I hope Yes:-)) - mrtg did write three files there. And I did chmod a+w

Originally Posted by wpte

how long did you wait before checking? it might take 5 minutes

I was absent for more then hour - nothing new:-((

SOLVED

Commented string 'RunAsDaemon: Yes' in config and started from terminal - it told me what it need - libjpeg & fontconfig packages

SOLVED

Anyway thank You for attention

ONE MORE TIP (I've spend some time to overcome)

When your uncommenting some interface in mrtg.cfg you MUST remove '#' sign and following SPACE simbol. String '_Target[localhost .....' will be ignored by mrtg

**kolaCZek** · 28-07-2010, 06:28

Some interesting MRTG settings and scripts...

CPU

MRTG settings

Code:

Target[cpu]: `/opt/etc/mrtg/cpu.sh`
MaxBytes[cpu]: 500
Title[cpu]: server CPU Load (5 minute average)
YLegend[cpu]: Load*100
ShortLegend[cpu]: load
Legend1[cpu]: CPU Load (x 100)
Legend2[cpu]:
LegendI[cpu]: 1min load
LegendO[cpu]: 5min load
PageTop[cpu]: server 5-minute average CPU Load
Options[cpu]: gauge,nopercent,integer,growright

cpu.sh

Code:

#!/bin/sh

awk </proc/loadavg '{print (100*$1) "\n" (100*$2) }'
hostname;
echo "loadavg";

Memory

(blue - RAM, green - Swap)

MRTG settings

Code:

Target[memory]: `/opt/etc/mrtg/memory.sh`
Title[memory]: Mem and Swap Usage
PageTop[memory]: <h1>Memory and Swap Usage</h1>
MaxBytes[memory]: 100000000000
ShortLegend[memory]: B
YLegend[memory]: Memory
LegendI[memory]: Swap
LegendO[memory]: Mem
Legend1[memory]: Swap
Legend2[memory]: Mem
Options[memory]: gauge,growright,nopercent

memory.sh

Code:

#!/bin/sh
/usr/bin/free | awk '\
NR==2 {ramUsed = $3 * 1000 }\
NR==3 {swapUsed = $3 * 1000 }\
END { print swapUsed "\n" ramUsed "\n0\n0" }'

Ping

MRTG settings

Code:

Title[ping]: RTT to google.com
PageTop[ping]: <H1>Round Trip Time</H1>
Target[ping]: `/opt/etc/mrtg/ping.sh`
MaxBytes[ping]: 2000
Options[ping]: growright,unknaszero,nopercent,gauge
LegendI[ping]: Pkt loss %
LegendO[ping]: Avg RTT
YLegend[ping]: RTT (ms)

ping.sh

Code:

#!/bin/sh
PING="/bin/ping"
ADDR="google.com"
DATA=`$PING -c10 $ADDR -q `
LOSS=`echo $DATA | awk '{print $18 }' | tr -d %`
echo $LOSS
if [ $LOSS = 100 ];
        then echo 0
else
        echo $DATA | awk -F/ '{print $5 }'
fi

/opt usage

MRTG settings

Code:

Target[df_opt]: `/opt/etc/mrtg/df_opt.sh`
Title[df_opt]: /opt usage
PageTop[df_opt]: <h1>/opt usage</h1>
MaxBytes[df_opt]: 100000000000
ShortLegend[df_opt]: M
YLegend[df_opt]: /opt
LegendI[df_opt]: Free
LegendO[df_opt]: Used
Legend1[df_opt]: Free
Legend2[df_opt]: Used
Options[df_opt]: gauge,growright,nopercent

df_opt.sh

Code:

#!/bin/sh

/bin/df | awk '\
NR==5 {used = $2 / 1024}\
NR==5 {free = $3 / 1024}\
END { print free "\n" used "\n0\n0" }'

/tmp/harddisk usage

MRTG settings

Code:

Target[df_harddisk]: `/opt/etc/mrtg/df_harddisk.sh`
Title[df_harddisk]: /tmp/harddisk usage
PageTop[df_harddisk]: <h1>/tmp/harddisk usage</h1>
MaxBytes[df_harddisk]: 100000000000
ShortLegend[df_harddisk]: M
YLegend[df_harddisk]: /tmp/harddisk
LegendI[df_harddisk]: Free
LegendO[df_harddisk]: Used
Legend1[df_harddisk]: Free
Legend2[df_harddisk]: Used
Options[df_harddisk]: gauge,growright,nopercent

df_harddisk.sh

Code:

#!/bin/sh

/bin/df | awk '\
NR==7 {used = $2 / 1024}\
NR==7 {free = $3 / 1024}\
END { print free "\n" used "\n0\n0" }'

**wpte** · 30-07-2010, 02:12

Very nice post kolaCZek!
they all work very well

Just a note for the memory script: it shows that I'm using 124kb, but according to free that is supposed to be in megabytes

**bigphantom** · 12-12-2010, 09:45

Originally Posted by andrewak

Can't find .html files. In the specified directory appeared three files:

mrtg-l.png
mrtg-m.png
mrtg-r.png

and no one .html

In /opt/etc/mrtg.cfg (which was left 'as-is' after creation) have two uncommented interfaces - eth0, eth1

Processes snmpd and mrtg are running.

i have a similarly problem, i get the 3 files from above and no html. (i waited, restart router several times and after several 10 minute period and still no html)

Code:

SNMP running
[admin@rtn root]$ pss | grep snmpd
  559 pts/0    S+     0:00          \_ grep snmpd
  215 ?        S      0:00 snmpd -c /tmp/snmpd.conf

MRTG running
[admin@rtn root]$ pss | grep mrtg
  561 pts/0    S+     0:00          \_ grep mrtg

rights for mrtg folder
[admin@rtn root]$ ls -la /mnt/www/
total 20
drwxr--r-- 4 admin root 4096 Dec 12 10:51 .
drwxr--r-- 5 admin root 4096 Dec 11 21:40 ..
drwxr-xr-x 3 admin root 4096 Dec 11 23:32 cgi-bin
-rwxrw-rw- 1 admin root   28 Dec 11 18:28 index.php
drwxr-xr-x 2 admin root 4096 Dec 12 11:05 mrtg

my mrtg.cfg file is:
/mnt/www/mtg - indicated by me because I have lighttpd & samba shares in place. I could not see the interfaces to uncomment ! What do i miss ?

Code:

# Created by
# /opt/bin/cfgmaker --global "WorkDir: /mnt/www/mrtg" --global "RunAsDaemon: Yes" --global "Options[_]: bits,growright" --output /opt/etc/mrtg.cfg public@localhost


### Global Config Options

#  for UNIX
# WorkDir: /home/http/mrtg

#  or for NT
# WorkDir: c:\mrtgdata

### Global Defaults

#  to get bits instead of bytes and graphs growing to the right
# Options[_]: growright, bits

EnableIPv6: no
WorkDir: /mnt/www/mrtg
RunAsDaemon: Yes
Options[_]: bits,growright

######################################################################
# System:
# Description:
# Contact:
# Location:
######################################################################

SOLVED

Commented string 'RunAsDaemon: Yes' in config and started from terminal - it told me what it need - libjpeg & packages

1) I've tried with this, but my ipkg says the 2 packs above are installed and up to date (I ran ipkg update first).

2) i killed the mrtg daemon and started it manually. I get this:

Code:

[admin@rtn root]$ /opt/etc/init.d/S99mrtg
Segmentation fault
Daemonizing MRTG ...

[admin@rtn root]$ pss | grep mrtg
  579 pts/0    S+     0:00          \_ grep mrtg
  577 ?        Ss     0:00 /opt/bin/perl -w /opt/bin/mrtg /opt/etc/mrtg.cfg

**andrewak** · 12-12-2010, 12:42

Unfortunately I've stopped to use mrtg because of hi processor load, but as I remember I can suggest

Originally Posted by bigphantom

my mrtg.cfg file is:
/mnt/www/mtg - indicated by me because I have lighttpd & samba shares in place. I could not see the interfaces to uncomment ! What do i miss ?

First of all stop mrtg, then rename or remove your mrgt.cfg (as if it just empty) and run:

/opt/bin/cfgmaker --global "WorkDir: /opt/share/www/mrtg" --global "RunAsDaemon: Yes" --global "Interval: 5" --global "Options[_]: bits,growright" --output /opt/etc/mrtg.cfg public@localhost

with Your WorkDir.

This must create new mrtg.cfg with such sections:

Code:

### Interface 1 >> Descr: 'lo' | Name: '' | Ip: '127.0.0.1' | Eth: '' ###
### The following interface is commented out because:
### * it is a Software Loopback interface
# 
# Target[localhost_1]: 1:public@localhost:
# SetEnv[localhost_1]: MRTG_INT_IP="127.0.0.1" MRTG_INT_DESCR="lo"
# MaxBytes[localhost_1]: 1250000
# Title[localhost_1]: Traffic Analysis for 1 -- noone-gateway
# PageTop[localhost_1]: <h1>Traffic Analysis for 1 -- noone-gateway</h1>
# 		<div id="sysdetails">
# 			<table>
# 				<tr>
# 					<td>System:</td>
# 					<td>noone-gateway in Unknown</td>
# 				</tr>
# 				<tr>
# 					<td>Maintainer:</td>
# 					<td>Administrator</td>
# 				</tr>
# 				<tr>
# 					<td>Description:</td>
# 					<td>lo  </td>
# 				</tr>
# 				<tr>
# 					<td>ifType:</td>
# 					<td>softwareLoopback (24)</td>
# 				</tr>
# 				<tr>
# 					<td>ifName:</td>
# 					<td></td>
# 				</tr>
# 				<tr>
# 					<td>Max Speed:</td>
# 					<td>10.0 Mbits/s</td>
# 				</tr>
# 				<tr>
# 					<td>Ip:</td>
# 					<td>127.0.0.1 (localhost.localdomain)</td>
# 				</tr>
# 			</table>
# 		</div>

This is what you need to uncomment (not all, but what you need).

Like this - remember that you need to remove leading spaces too:

Code:

Target[localhost_4]: 4:public@localhost:
SetEnv[localhost_4]: MRTG_INT_IP="" MRTG_INT_DESCR="eth1"
MaxBytes[localhost_4]: 1250000
Title[localhost_4]: Traffic Analysis for 4 -- noone-gateway
PageTop[localhost_4]: <h1>Traffic Analysis for 4 -- noone-gateway</h1>
		<div id="sysdetails">
			<table>
				<tr>
					<td>System:</td>
					<td>noone-gateway in Unknown</td>
				</tr>
				<tr>
					<td>Maintainer:</td>
					<td>Administrator</td>
				</tr>
				<tr>
					<td>Description:</td>
					<td>eth1  </td>
				</tr>
				<tr>
					<td>ifType:</td>
					<td>ethernetCsmacd (6)</td>
				</tr>
				<tr>
					<td>ifName:</td>
					<td></td>
				</tr>
				<tr>
					<td>Max Speed:</td>
					<td>10.0 Mbits/s</td>
				</tr>
			</table>
		</div>

Originally Posted by bigphantom

1) I've tried with this, but my ipkg says the 2 packs above are installed and up to date (I ran ipkg update first).

Then you must comment line:
#RunAsDaemon: Yes

in your mrtg.cfg and run

/opt/bin/mrtg /opt/etc/mrtg.cfg

you will see the whole process, But I think that your main problem is that you have no interfaces in mrtg.cfg

Originally Posted by bigphantom

2) i killed the mrtg daemon and started it manually. I get this:

Code:

[admin@rtn root]$ /opt/etc/init.d/S99mrtg
Segmentation fault

Daemonizing MRTG ...

[admin@rtn root]$ pss | grep mrtg
  579 pts/0    S+     0:00          \_ grep mrtg
  577 ?        Ss     0:00 /opt/bin/perl -w /opt/bin/mrtg /opt/etc/mrtg.cfg

I think that "Segmentation fault" mean that you shell check (with fsck) your harddisk - I've did it on my linux desktop.

**rumenchooo** · 10-03-2011, 18:28

Simply perfect.

Working like a charm.

Cpu load is acceptable.

Thank you wpte.

Regards
Rumen

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