About

LibreNMS Docker image based on Alpine Linux and Nginx.
If you are interested, check out my other Docker images!

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• Features
• Demo
• Build locally
• Image
• Environment variables
  • General
  • Redis
  • Dispatcher service
  • Syslog-ng
  • Snmptrapd
  • Database
  • Misc
• Volumes
• Ports
• Usage
  • Docker Compose
  • Command line
  • First launch
• Upgrade
• Configuration Management
  • Initial Configuration
  • Live Configuration
  • Re-Apply YAML Config
  • Live Config
• Notes
  • LNMS command
  • Validate
  • Dispatcher service container
  • Syslog-ng container
  • Snmptrapd container
  • Add a LibreNMS plugin
  • Additional Monitoring plugins
  • Custom alert templates
• Contributing
• License

Features

• Run as non-root user
• Multi-platform image
• Dispatcher service as "sidecar" container
• Syslog-ng support through a "sidecar" container
• Snmp-trap support through a "sidecar" container
• Built-in LibreNMS Weathermap plugin
• Ability to add custom Monitoring plugins
• Ability to add custom alert templates
• OPCache enabled to store precompiled script bytecode in shared memory
• s6-overlay as process supervisor
• Traefik as reverse proxy and creation/renewal of Let's Encrypt certificates (see this template)
• Redis image ready to use for better scalability
• RRDcached image ready to use for data caching and graphs
• msmtpd SMTP relay image to send emails
• MariaDB image as database instance

Demo

Build locally

$ git clone https://github.com/librenms/docker.git docker-librenms
$ cd docker-librenms

# Build image and output to docker (default)
$ docker buildx bake

# Build multi-platform image
$ docker buildx bake image-all

Image

Following platforms for this image are available:

$ docker run --rm mplatform/mquery librenms/librenms:latest
Image: librenms/librenms:latest
 * Manifest List: Yes
 * Supported platforms:
   - linux/amd64
   - linux/arm/v6
   - linux/arm/v7
   - linux/arm64
   - linux/386
   - linux/ppc64le
   - linux/s390x

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)
• MAX_INPUT_VARS: PHP max input vars (default 1000)
• UPLOAD_MAX_SIZE: Upload max size (default 16M)
• CLEAR_ENV: Clear environment in FPM workers (default yes)
• OPCACHE_MEM_SIZE: PHP OpCache memory consumption (default 128)
• LISTEN_IPV6: Enable IPv6 for Nginx (default true)
• 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 for access log_format on Nginx. (default remote_addr)
• SESSION_DRIVER: Driver to use for session storage (default file)
• CACHE_DRIVER: Driver to use for cache and locks (default database)

Redis

Note

Redis variables should be set on all containers and are required when running more than one dispatcher.

• REDIS_HOST: Redis host for poller synchronization
• REDIS_SENTINEL: Redis Sentinel host for high availability Redis cluster
• REDIS_SENTINEL_SERVICE: Redis Sentinel service name (default librenms)
• REDIS_SCHEME: Redis scheme (default tcp)
• REDIS_PORT: Redis port (default 6379)
• REDIS_PASSWORD: Redis password
• REDIS_DB: Redis database (default 0)
• REDIS_CACHE_DB: Redis cache database (default 1)

Dispatcher service

Warning

Only used if you enable and run a sidecar dispatcher container.

• SIDECAR_DISPATCHER: Set to 1 to enable sidecar dispatcher mode for this container (default 0)
• DISPATCHER_NODE_ID: Unique node ID for your dispatcher service
• DISPATCHER_ARGS: Additional args to pass to the dispatcher service

Syslog-ng

Warning

Only used if you enable and run a sidecar syslog-ng container.

• SIDECAR_SYSLOGNG: Set to 1 to enable sidecar syslog-ng mode for this container (default 0)

Snmptrapd

Warning

Only used if you enable and run a sidecar snmptrapd container.

• SIDECAR_SNMPTRAPD: Set to 1 to enable sidecar snmptrapd mode for this container (default 0)
• SNMP_PROCESSING_TYPE: Sets which type of processing (log, execute, and/or net) to use with the SNMP trap (default log,execute,net)
• SNMP_USER: Defines what username to authenticate with (default librenms_user)
• SNMP_AUTH: Defines what password to authenticate with (default auth_pass should not be used, but will work)
• SNMP_PRIV: Defines what password to encrypt packages with (default priv_pass should not be used, but will work)
• SNMP_AUTH_PROTO: Sets what protocol (MD5|SHA) to use for authentication (default SHA)
• SNMP_PRIV_PROTO: Sets what protocol (DES|AES) to use for encryption of packages (default AES)
• SNMP_SECURITY_LEVEL: Sets what security level (noauth|priv) to use (default priv)
• SNMP_ENGINEID: Defines what SNMP EngineID to use (default 1234567890)
• SNMP_DISABLE_AUTHORIZATION: Will disable the above access control checks, and revert to the previous behaviour of accepting all incoming notifications. (default yes)

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 60)

Misc

• LIBRENMS_BASE_URL: URL of your LibreNMS instance (default /)
• LIBRENMS_SNMP_COMMUNITY: This container's SNMP v2c community string (default librenmsdocker)
• LIBRENMS_WEATHERMAP: Enable LibreNMS Weathermap plugin (default false)
• LIBRENMS_WEATHERMAP_SCHEDULE: CRON expression format (default */5 * * * *)
• MEMCACHED_HOST: Hostname / IP address of a Memcached server
• MEMCACHED_PORT: Port of the Memcached server (default 11211)
• RRDCACHED_SERVER: RRDcached server (eg. rrdcached:42217)

Volumes

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

Warning

Note that the volume should be owned by the user/group with the specified PUID and PGID. If you don't give the volume correct permissions, the container may not start.

Ports

• 8000: HTTP port
• 514 514/udp: Syslog ports (only used if you enable and run a sidecar syslog-ng container)
• 162 162/udp: Snmptrapd ports (only used if you enable and run a sidecar snmptrapd container)

Usage

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:

$ docker-compose up -d
$ docker-compose logs -f

Command line

You can also use the following minimal command:

$ docker run -d -p 8000:8000 --name librenms \
  -v $(pwd)/data:/data \
  -e "DB_HOST=db" \
  librenms/librenms:latest

Warning

db must be a running MySQL instance.

First launch

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

Login	Password
librenms	librenms

Note

You can create another one using the lnms command.

Upgrade

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

$ docker-compose down
$ docker-compose pull
$ docker-compose up -d

Configuration Management

Initial Configuration

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

page_refresh: 300
webui.default_dashboard_id: 0

This configuration will be seeded into the LibreNMS database when it is first deployed and will override the default values.

Live Configuration

You can edit the running configuration via the LibreNMS web UI or lnms config:set

docker-compose exec librenms lnms config:set page_refresh 300

Re-Apply YAML Config

Set REAPPLY_YAML_CONFIG=1 to overwrite any settings that are set during initial config or via user config back to their initial values every time the container is deployed.

Live Config

Using this config method, configuration changes will be reflected live on the containers, BUT you will be unable to edit the configured settings from within the LibreNMS web UI or lnms config:set.

The same example using PHP /data/config/webui.php

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

Notes

LNMS command

If you want to use the lnms command to perform common server operations like manage users, database migration, and more, type:

$ docker-compose exec librenms lnms

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  | 1.64
DB Schema | 2020_04_19_010532_eventlog_sensor_reference_cleanup (165)
PHP       | 7.3.18
Python    | 3.8.2
MySQL     | 10.4.13-MariaDB-1:10.4.13+maria~bionic
RRDTool   | 1.7.2
SNMP      | NET-SNMP 5.8
====================================

[OK]    Installed from the official Docker image; no Composer required
[OK]    Database connection successful
[OK]    Database schema correct
[WARN]  IPv6 is disabled on your server, you will not be able to add IPv6 devices.
[WARN]  Updates are managed through the official Docker image

Dispatcher service container

If you want to enable the new Dispatcher service, you have to run a "sidecar" container (see dispatcher service in docker-compose.yml example) or run a simple container like this:

$ docker run -d --name librenms_dispatcher \
  --env-file $(pwd)/librenms.env \
  -e SIDECAR_DISPATCHER=1 \
  -e DISPATCHER_NODE_ID=dispatcher1 \
  -v librenms:/data \
  librenms/librenms:latest

Warning

librenms must be a valid volume already attached to a LibreNMS container.

Syslog-ng container

If you want to enable syslog-ng, you have to run a "sidecar" container (see syslog-ng service in docker-compose.yml example) or run a simple container like this:

$ docker run -d --name librenms_syslog \
  --env-file $(pwd)/librenms.env \
  -e SIDECAR_SYSLOGNG=1 \
  -p 514 -p 514/udp \
  -v librenms:/data \
  librenms/librenms:latest

Warning

librenms must be a valid volume already attached to a LibreNMS container.

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

enable_syslog: true

Snmptrapd container

If you want to enable snmptrapd, you have to run a "sidecar" container (see snmptrapd service in docker-compose.yml example) or run a simple container like this:

$ docker run -d --name librenms_snmptrapd \
  --env-file $(pwd)/librenms.env \
  -e SIDECAR_SNMPTRAPD=1 \
  -p 162 -p 162/udp \
  -v librenms:/data \
  librenms/librenms:latest

Warning

librenms must be a valid volume already attached to a LibreNMS container.

Add a LibreNMS plugin

You can add plugins for LibreNMS in /data/plugins/. If you add a plugin that already exists in LibreNMS, it will be removed and yours will be used (except for Weathermap).

Warning

Container has to be restarted to propagate changes.

Additional Monitoring plugins

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

Some plugins can be found in the Monitoring Plugins repo, or in the unofficial fork for Nagios.

Warning

Container has to be restarted to propagate changes.

Custom alert templates

You can add Laravel alert templates in /data/alert-templates/.

Warning

Container has to be restarted to propagate changes.

Contributing

Want to contribute? Awesome! The most basic way to show your support is to star the project, or to raise issues. You can also support this project by becoming a sponsor on GitHub or by making a Paypal donation to ensure this journey continues indefinitely!

Thanks again for your support, it is much appreciated! 🙏

License

MIT. See LICENSE for more details.