librenms

Dockerized version of librenms with support for external database, both communitiy and professional editions (via arbritrary svn source), packages to allow native LDAP auth, and easy plugin support by exposing htmldir as a volume.

At BT plc. we use this to provide portability to our NMS. With a flexible image, it's easy to manage 2+ instances with Puppet or [insert way to configure/schedule containers here]. Good use cases would be instances for corp and prod, managed services and internal, or just a single one that's more predictable on any box.

Using this image

Examples assume the following directory layout:

$ tree $PWD
/opt/librenms/volumes
├── config
│   └── config.php
├── html
├── logs
└── rrd

Linking volumes and using librenms CE:

$ docker run -d \
    --name librenms \
    -p 8000:8000 \
    -v /opt/librenms/volumes/config:/config \
    -v /opt/librenms/volumes/html:/opt/librenms/html \
    -v /opt/librenms/volumes/logs:/opt/librenms/logs \
    -v /opt/librenms/volumes/rrd:/opt/librenms/rrd \
    BT plc./librenms

Using librenms PE (or another SVN source):

$ docker run -d \
    --name librenms \
    -p 8000:8000 \
    -v /opt/librenms/volumes/config:/config \
    -v /opt/librenms/volumes/html:/opt/librenms/html \
    -v /opt/librenms/volumes/logs:/opt/librenms/logs \
    -v /opt/librenms/volumes/rrd:/opt/librenms/rrd \
    -e USE_SVN=true \
    -e [email protected] \
    -e SVN_PASS=dfed555743854a475345ae01a7668acc \
    -e SVN_REPO=http://svn.librenms.org/svn/librenms/trunk \
    BT plc./librenms

Using docker-compose:

$ #check and modify contents of docker-compose.yml.default
  #afterwards rename it to docker-compose.yml and run
 docker-compose up #for running as deamon add -d parameter

Volumes

The following volumes are set in the container:

Volume	Purpose
/config	config.php should go here
/opt/librenms/html	This allows you to add HTML plugins if you wish (such as weathermap!)
/opt/librenms/logs	HTTP error/access, librenms.log and update-errors.log
/opt/librenms/rrd	Mount this where you have a ample space and back up!
/var/run/mysqld/mysqld.sock	If you're running MySQL on the local Docker host, make use of this volume and set the SQL host to localhost in config.php

If you need to sub-in random, single files just add an extra -v argument to your run (or however you're starting the container. Puppet anyone?) to the path. We do this for /etc/php5/apache2/php.ini

Ports

Only TCP/8000 is exposed.

Environment variables

Variable	Default Value
WORKERS	2
USE_WEATHERMAP	false
CUSTOM_PHP_INI	false
HOUSEKEEPING_ARGS	'-yet'
USE_SVN	false
SVN_USER	N/A
SVN_PASS	N/A
SVN_REPO	N/A

If you don't have a subscription but run your own managed copy, feel free to sub-in your own repo.

Depending on your number of devices, the default 2 workers likely isn't enough based on a polling period every 5 minutes. Just pass WORKERS=32, for example, if your total core count is 32 and you want to use them all.

Weathermap

As in the list above, setting USE_WEATHERMAP will install network-weathermap under the htmldir if not there already and schedule map-poller.php in cron.

To modify configuration, volume mount librenms's htmldir to access weathermap.

Maintenance

librenms has a tendancy to become huge over time with its eventlog containing every port that flaps, syslog, performance timings for every run, and more.

This image comes with a cronjob that will run daily for you to clean this up. By default it will run with the switches set for eventlog and performance timings, but like most things in this image it can be overridden by providing HOUSEKEEPING_ARGS as an environment variable.

Please checkout out the initial post in the mailing list for details on how to configure your config.php for better control and what each switch does.

Currently the stdout/stderr for the job isn't being sent to /dev/null so you should be able to see the status of your cleanups with docker logs [id]

It is recommended by librenms to run the housekeeping script manually first before relying on the crons since it may take awhile to first run. Do this if you are using existing data for this image.

Notes

This image installs and runs rrdcached. To make use of it, make sure your librenms configuration sets

$config['rrdcached']    = "unix:/var/run/rrdcached.sock"