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Last pushed: 4 months ago
Short Description
Distributed, massively scalable, highly extensible MQTT message broker written in Erlang/OTP.
Full Description

EMQ Docker

EMQ (Erlang MQTT Broker) is a distributed, massively scalable, highly extensible MQTT message broker written in Erlang/OTP.

Current docker image size: 37.1 MB

Get emqttd

You can build this docker image by yourself.

git clone -b master https://github.com/emqtt/emq_docker.git
cd emq_docker
docker build -t emq:latest .

Run emqttd

Execute some command under this docker image

docker run --rm -ti -v `pwd`:$(somewhere) emq/$(image) $(somecommand)

For example

docker run --rm -ti --name emq -p 18083:18083 -p 1883:1883 asierg95/emqttd

Configuration

Use the environment variable to configure the EMQ docker container

The environment variables which with EMQ_ prefix are mapped to configuration file, . get replaced by __.

Example:

EMQ_LISTENER__SSL__EXTERNAL__ACCEPTORS <--> listener.ssl.external.acceptors
EMQ_MQTT__MAX_PACKET_SIZE              <--> mqtt.max_packet_size

Also the environment variables which with PLATFORM_ prefix are mapped to template string in configuration file.

PLATFORM_ETC_DIR                   <--> {{ platform_etc_dir }}

Non mapped environment variables:

EMQ_NAME
EMQ_HOST

These environment variables will ignore for configuration file.

EMQ Configuration

NOTE: All EMQ Configuration in etc/emq.conf could config by environment. The following list is just an example, not a complete configuration.

Oprtions Default Mapped Description
EMQ_NAME container name none emq node short name
EMQ_HOST container IP none emq node host, IP or FQDN
EMQ_JOIN_CLUSTER none none Initial cluster to join
EMQ_ADMIN_PASSWORD public none emq admin password
PLATFORM_ETC_DIR /opt/emqtt/etc {{ platform_etc_dir }} The etc directory
PLATFORM_LOG_DIR /opt/emqtt/log {{ platform_log_dir }} The log directory
EMQ_NODE__NAME EMQ_NAME@EMQ_HOST node.name Erlang node name, name@ipaddress/host
EMQ_NODE__COOKIE emq_dist_cookie node.cookie cookie for cluster
EMQ_LOG__CONSOLE console log.console log console output method
EMQ_MQTT__ALLOW_ANONYMOUS true mqtt.allow_anonymous allow mqtt anonymous login
EMQ_LISTENERTCPEXTERNAL 1883 listener.tcp.external MQTT TCP port
EMQ_LISTENERSSLEXTERNAL 8883 listener.ssl.external MQTT TCP TLS/SSL port
EMQ_LISTENERWSEXTERNAL 8083 listener.ws.external HTTP and WebSocket port
EMQ_LISTENERWSSEXTERNAL 8084 listener.wss.external HTTPS and WSS port
EMQ_MQTT__MAX_PACKET_SIZE 64KB mqtt.max_packet_size Max Packet Size Allowed

The list is incomplete and may changed with etc/emq.conf and plugin configuration files. But the mapping rule is similar.

If set EMQ_NAME and EMQ_HOST, and unset EMQ_NODE__NAME, EMQ_NODE__NAME=$EMQ_NAME@$EMQ_HOST.

For example, set mqtt tcp port to 1883

docker run --rm -ti --name emq -e EMQ_LISTENER__TCP__EXTERNAL=1883 -p 18083:18083 -p 1883:1883 asierg95/emqttd

EMQ Loaded Plugins Configuration

Oprtions Default Description
EMQ_LOADED_PLUGINS see content below default plugins emq loaded

Default environment variable EMQ_LOADED_PLUGINS, including

  • emq_recon
  • emq_modules
  • emq_retainer
  • emq_dashboard
# The default EMQ_LOADED_PLUGINS env
EMQ_LOADED_PLUGINS="emq_recon,emq_modules,emq_retainer,emq_dashboard"

For example, load emq_auth_redis plugin, set it into EMQ_LOADED_PLUGINS and use any separator to separates it.

You can use comma, space or other separator that you want.

All the plugin you defined in env EMQ_LOADED_PLUGINS will be loaded.

EMQ_LOADED_PLUGINS="emq_auth_redis,emq_recon,emq_modules,emq_retainer,emq_dashboard"
EMQ_LOADED_PLUGINS="emq_auth_redis emq_recon emq_modules emq_retainer emq_dashboard"
EMQ_LOADED_PLUGINS="emq_auth_redis | emq_recon | emq_modules | emq_retainer | emq_dashboard"

EMQ Plugin Configuration

The environment variables which with EMQ_ prefix are mapped to all emq plugins' configuration file, . get replaced by __.

Example:

EMQ_AUTH__REDIS__SERVER   <--> auth.redis.server
EMQ_AUTH__REDIS__PASSWORD <--> auth.redis.password

Don't worry about where to find the configuration file of emq plugins, this docker image will find and config them automatically using some magic.

All plugin of emq project could config in this way, following the environment variables mapping rule above.

Assume you are using redis auth plugin, for example:

#EMQ_AUTH__REDIS__SERVER="redis.at.yourserver"
#EMQ_AUTH__REDIS__PASSWORD="password_for_redis"

docker run --rm -ti --name emq -p 18083:18083 -p 1883:1883 -p 4369:4369 \
    -e EMQ_LISTENER__TCP__EXTERNAL=1883 \
    -e EMQ_LOADED_PLUGINS="emq_auth_redis,emq_recon,emq_modules,emq_retainer,emq_dashboard" \
    -e EMQ_AUTH__REDIS__SERVER="your.redis.server:6379" \
    -e EMQ_AUTH__REDIS__PASSWORD="password_for_redis" \
    -e EMQ_AUTH__REDIS__PASSWORD_HASH=plain \
    asierg95/emqttd

Cluster

You can specify a initial cluster and join.

Note: You must publsh port 4369 and range of port 6000-6999 for EMQ Clustered.

For example, using 6000-6100 for cluster.


docker run --rm -ti --name emq -p 18083:18083 -p 1883:1883 -p 4369:4369 -p 6000-6100:6000-6100 \
    -e EMQ_NAME="emq" \
    -e EMQ_HOST="s2.emqtt.io" \
    -e EMQ_LISTENER__TCP__EXTERNAL=1883 \
    -e EMQ_JOIN_CLUSTER="emq@s1.emqtt.io" \
    asierg95/emqttd

Kernel Tuning

Under linux host machine, the easiest way is tuning host machine's kernel.

If you want tune linux kernel by docker, you must ensure your docker is latest version (>=1.12).


docker run --rm -ti --name emq -p 18083:18083 -p 1883:1883 -p 4369:4369 \
    --sysctl fs.file-max=2097152 \
    --sysctl fs.nr_open=2097152 \
    --sysctl net.core.somaxconn=32768 \
    --sysctl net.ipv4.tcp_max_syn_backlog=16384 \
    --sysctl net.core.netdev_max_backlog=16384 \
    --sysctl net.ipv4.ip_local_port_range=1000 65535 \
    --sysctl net.core.rmem_default=262144 \
    --sysctl net.core.wmem_default=262144 \
    --sysctl net.core.rmem_max=16777216 \
    --sysctl net.core.wmem_max=16777216 \
    --sysctl net.core.optmem_max=16777216 \
    --sysctl net.ipv4.tcp_rmem=1024 4096 16777216 \
    --sysctl net.ipv4.tcp_wmem=1024 4096 16777216 \
    --sysctl net.ipv4.tcp_max_tw_buckets=1048576 \
    --sysctl net.ipv4.tcp_fin_timeout=15

REMEMBER: DO NOT RUN EMQ DOCKER PRIVILEGED OR MOUNT SYSTEM PROC IN CONTAINER TO TUNE LINUX KERNEL, IT IS UNSAFE.

Added from: https://github.com/emqtt/emq-docker

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