About

🐳 LibreNMS Docker image based on Alpine Linux and Nginx.
It's a fork of CrazyMax's LibreNMS Docker image repository. If you are interested, check out his other 🐳 Docker images!

Features

Included

• Alpine Linux 3.9, Nginx, PHP 7.2
• Cron tasks as a "sidecar" container
• Syslog-ng support through a "sidecar" container
• Ability to configure distributed polling
• Ability to add custom Monitoring plugins (Nagios)
• OPCache enabled to store precompiled script bytecode in shared memory

From docker-compose

• Traefik as reverse proxy and creation/renewal of Let's Encrypt certificates
• Memcached image ready to use for better scalability
• RRDcached image ready to use for better scalability
• Postfix SMTP relay image to send emails
• MariaDB image as database instance
• Cron jobs as a "sidecar" container
• Syslog-ng support through a "sidecar" container

Docker

Environment variables

General

• TZ : The timezone assigned to the container (default UTC)
• PUID : LibreNMS user id (default 1000)
• PGID: LibreNMS group id (default 1000)
• MEMORY_LIMIT : PHP memory limit (default 256M)
• UPLOAD_MAX_SIZE : Upload max size (default 16M)
• OPCACHE_MEM_SIZE : PHP OpCache memory consumption (default 128)
• REAL_IP_FROM : Trusted addresses that are known to send correct replacement addresses (default 0.0.0.0/32)
• REAL_IP_HEADER : Request header field whose value will be used to replace the client address (default X-Forwarded-For)
• LOG_IP_VAR : Use another variable to retrieve the remote IP address in Nginx. If you use a reverse proxy you can set http_x_forwarded_for example. (default remote_addr)

(Distributed) Poller

• LIBRENMS_POLLER_THREADS : Threads that poller-wrapper.py runs (default 16)
• LIBRENMS_POLLER_INTERVAL : Interval in minutes at which poller-wrapper.py runs (defaults to 5) docs
• LIBRENMS_DISTRIBUTED_POLLER_ENABLE : Enable distributed poller functionality
• LIBRENMS_DISTRIBUTED_POLLER_NAME : Optional name of poller (defaults to hostname)
• LIBRENMS_DISTRIBUTED_POLLER_GROUP : By default, all hosts are shared and have the poller_group = 0. To pin a device to a poller, set it to a value greater than 0 and set the same value here. One can also specify a comma separated string of poller groups. The poller will then poll devices from any of the groups listed. docs
• LIBRENMS_DISTRIBUTED_POLLER_MEMCACHED_HOST : Memcached server for poller synchronization (Defaults to $MEMCACHED_HOST)
• LIBRENMS_DISTRIBUTED_POLLER_MEMCACHED_PORT : Port of memcached server (Defaults to $MEMCACHED_PORT)

Cron

• LIBRENMS_CRON_DISCOVERY_ENABLE : Enable LibreNMS discovery for this container cronjobs (default true)
• LIBRENMS_CRON_DAILY_ENABLE : Enable LibreNMS daily script for this container cronjobs (default true)
• LIBRENMS_CRON_ALERTS_ENABLE : Enable LibreNMS alerts generation for this container cronjobs (default true)
• LIBRENMS_CRON_BILLING_ENABLE : Enable LibreNMS billing polling for this container cronjobs (default true)
• LIBRENMS_CRON_BILLING_CALCULATE_ENABLE : Enable LibreNMS billing for this container cronjobs (default true)
• LIBRENMS_CRON_CHECK_SERVICES_ENABLE : Enable LibreNMS service checks for this container cronjobs (default true)
• LIBRENMS_CRON_POLLER_ENABLE : Enable LibreNMS polling for this container cronjobs (default true)

Database

• DB_HOST : MySQL database hostname / IP address
• DB_PORT : MySQL database port (default 3306)
• DB_NAME : MySQL database name (default librenms)
• DB_USER : MySQL user (default librenms)
• DB_PASSWORD : MySQL password (default librenms)
• DB_TIMEOUT : Time in seconds after which we stop trying to reach the MySQL server (useful for clusters, default 30)

Misc

• LIBRENMS_SNMP_COMMUNITY : This container's SNMP v2c community string (default librenmsdocker)
• MEMCACHED_HOST : Hostname / IP address of a Memcached server
• MEMCACHED_PORT : Port of the Memcached server (default 11211)
• RRDCACHED_HOST : Hostname / IP address of a RRDcached server
• RRDCACHED_PORT : Port of the RRDcached server (default 42217)

Volumes

• /data : Contains configuration, rrd database, logs, additional Monitoring plugins, additional syslog-ng config files

Ports

• 80 : HTTP port
• 514 514/udp : Syslog ports

Use this image

Docker Compose

Docker compose is the recommended way to run this image. Copy the content of folder examples/compose in /var/librenms/ on your host for example. Edit the compose and env files with your preferences and run the following commands :

touch acme.json
chmod 600 acme.json
docker-compose up -d
docker-compose logs -f

Command line

You can also use the following minimal command :

docker run -d -p 80:80 --name librenms \
  -v $(pwd)/data:/data \
  -e "DB_HOST=db" \
  librenms/librenms:latest

-e "DB_HOST=db"
⚠️ db must be a running MySQL instance

Notes

Edit configuration

You can edit configuration of LibreNMS by placing *.php files inside /data/config folder. Let's say you want to edit the WebUI config. Create a file called for example /data/config/webui.php with this content :

<?php
$config['page_refresh'] = "300";
$config['webui']['default_dashboard_id'] = 0;

This configuration will be included in LibreNMS and will override the default values.

Add user

On first launch, an initial administrator user will be created :

Login	Password
librenms	librenms

You can create an other user using the commande line :

$ docker-compose exec --user librenms librenms php adduser.php <name> <pass> 10 <email>

⚠️ Substitute your desired username <name>, password <pass> and email address <email>

Validate

If you want to validate your installation from the CLI, type the following command :

$ docker-compose exec --user librenms librenms php validate.php
====================================
Component | Version
--------- | -------
LibreNMS  | 1.41
DB Schema | 253
PHP       | 7.2.7
MySQL     | 10.2.16-MariaDB-10.2.16+maria~jessie
RRDTool   | 1.7.0
SNMP      | NET-SNMP 5.7.3
====================================

[OK]    Composer Version: 1.6.5
[OK]    Dependencies up-to-date.
[OK]    Database connection successful
[OK]    Database schema correct
[WARN]  You have not added any devices yet.
        [FIX] You can add a device in the webui or with ./addhost.php
[WARN]  Your install is over 24 hours out of date, last update: Sat, 30 Jun 2018 21:37:37 +0000
        [FIX] Make sure your daily.sh cron is running and run ./daily.sh by hand to see if there are any errors.
[WARN]  Your local git branch is not master, this will prevent automatic updates.
        [FIX] You can switch back to master with git checkout master

Update database

To update the database manually, type the following command :

$ docker-compose exec --user librenms librenms php build-base.php

Crons

If you want to enable the cron job, you have to run a "sidecar" container like in the docker-compose file or run a simple container like this :

docker run -d --name librenms_cron \
  --env-file $(pwd)/librenms.env \
  -v librenms:/data \
  librenms/librenms:latest /usr/local/bin/cron

-v librenms:/data
⚠️ librenms must be a valid volume already attached to a LibreNMS container

Syslog-ng

If you want to enable syslog-ng, you have to run a "sidecar" container like in the docker-compose file or run a simple container like this :

docker run -d --name librenms_syslog \
  --env-file $(pwd)/librenms.env \
  -p 514 -p 514/udp \
  -v librenms:/data \
  librenms/librenms:latest /usr/sbin/syslog-ng -F

You have to create a configuration file to enable syslog in LibreNMS too. Create a file called for example /data/config/syslog.php with this content :

<?php
$config['enable_syslog'] = 1;

Additional Monitoring plugins (Nagios)

You can add a custom Monitoring (Nagios) plugin in /data/monitoring-plugins/.

⚠️ Container has to be restarted to propagate changes

Upgrade

To upgrade to the latest version of LibreNMS, pull the newer image and launch the container. LibreNMS will upgrade automatically :

docker-compose pull
docker-compose up -d

How can I help ?

All kinds of contributions are welcome 🙌!
The most basic way to show your support is to star 🌟 the project, or to raise issues 💬
But we're not gonna lie to each other, I'd rather you buy me a beer or two 🍻!

License

MIT. See LICENSE for more details.