Hacked my way through getting Observium to pick up the nfsen RRD so that I see the Netflow tab in the device in Observium.


Here’s what I did…

Install Prerequisite Software

apt-get install gcc flex librrd-dev make librrdp-perl librrds-perl libsocket6-perl libmailtools-perl mrtg rrdtool

Install nfdump

Download nfdump from SourceForge: https://sourceforge.net/projects/nfdump/files/stable/nfdump-1.6.13/

tar zxvf nfdump-1.6.13.tgz
cd nfdump-1.6.13/
./configure --enable-nfprofile --enable-nftrack
make && make install

Install nfsen

Download nfsen from SourceForge: https://sourceforge.net/projects/nfsen/files/stable/nfsen-1.3.7/

tar zxvf nfsen-1.3.7.tgz
cd nfsen-1.3.7
cp etc/nfsen.conf.dist etc/nfsen.conf

Make configuration changes to nfsen

Modify etc/nfsen.conf

$USER = "www-data";

$WWWUSER = "www-data";

$WWWGROUP = "www-data";

%sources = (

'routername' => { 'port' => '9996', 'col' => '#0000ff', 'type' => 'netflow', 'IP' => '' },


$MAIL_FROM = 'me@domain.com';

$SMTP_SERVER = 'mail.domain.com';

Save the file and then make a directory where nfsen will store data.

mkdir -p /var/nfsen
./install.pl etc/nfsen.conf

Start nfsen

cd /var/nfsen/bin
./nfsen start

Configure to start nfsen automatically at reboot.

ln -s /var/nfsen/bin/nfsen /etc/init.d/nfsen
update-rc.d nfsen defaults 20

Configure Apache2

Configure Apache2 so we can access nfsen while still using observium.

Make a directory to store nfsen HTML files

mkdir -p /var/www/html/nfsen

Edit /etc/apache2/conf-enabled/observium.conf and add the following line before the closing </VirtualHost>.

Alias "/nfsen" "/var/www/html/nfsen"

Restart Apache2

service apache2 restart

At this point you should be able to access http://yourip/nfsen/nfsen.php

Cannot create graph

If you see that error, check permissions of /var/nfsen and make sure it is accessible by www-data specified in /var/nfsen/etc/nfsen.conf.

Observium Configuration

Note: The %source in /var/nfsen/etc/nfsen.config must match the host you are using in Observium and it is case sensitive.

So I had a hard time with Observium configuration and decided to just hack it up.

I have Observium installed in /opt/observium, so substitute accordingly.

Add the following to /opt/observium/config.php.

$config['nfsen_enable'] = 1;
$config['nfsen_rrds'] = "/var/nfsen/profiles-stat/live/";
$config['nfsen_split_char'] = "";
$config['nfsen_suffix'] = "";

Enjoy your graphs.