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LibreNMS is an autodiscovering PHP/MySQL/SNMP based network monitoring which includes support for a wide range of network hardware and operating systems including Cisco, Linux, Juniper, Foundry, and many more.

LibreNMS is a community-based fork of the last GPL-licensed version of Observium.


Currently hosted on netmon1002 and netmon2001

Replaces Observium which ran on Streber.

  • Software is not installed via Debian package
  • Software installed in: /srv/deployment/librenms/
  • RRD data stored in: /srv/librenms/
  • User creds are stored in MySQL: # grep auth_mechanism /srv/deployment/librenms/librenms/config.php
  • Authentication is done via LDAP

How to

Add a device to LibreNMS

Configure the read only v2c SNMP community on the device

$ ssh
$ cd /srv/deployment/librenms/librenms
$ sudo -u librenms php addhost.php <fqdn>
Added device <fqdn> (XXX)
$ sudo -u librenms php discovery.php -h XXX && sudo -u librenms php poller.php -h XXX


Interface grouping

LibreNMS can group interfaces based on their description's prefix, for example "Transit:", "Peering:". Which is shown under the "ports" dropdown.

Prefixes not shown in the dropdown are still reachable by editing the URL, for example:

IRC Alerting

LibreNMS IRC bot named librenms-wmf outputs the alerts and recoveries on the -operations channel. This to help correlate series of alerts between different monitoring tools.

More details about the alerts can be found on .

If the bot misbehaves or is too noisy and needs to be stopped, three options:

Then file a task to track the issue.

External links