TODO: ...

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

Current docker image size: 37.1 MB

You can build this docker image by yourself.

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

Execute some command under this docker image

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

For example

docker run --rm -ti --name emqx -p 18083:18083 -p 1883:1883 emqx:latest

The emqx broker runs as linux user emqx in the docker container.

Use the environment variable to configure the EMQ X docker container.

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

Example:

EMQX_LISTENER__SSL__EXTERNAL__ACCEPTORS <--> listener.ssl.external.acceptors
EMQX_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:

EMQX_NAME
EMQX_HOST

These environment variables will ignore for configuration file.

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

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

If set EMQX_NAME and EMQX_HOST, and unset EMQX_NODE__NAME, EMQX_NODE__NAME=$EMQX_NAME@$EMQX_HOST.

For example, set mqtt tcp port to 1883

docker run --rm -ti --name emqx -e EMQX_LISTENER__TCP__EXTERNAL=1883 -p 18083:18083 -p 1883:1883 emqx:latest

Default environment variable EMQX_LOADED_PLUGINS, including

• emqx_recon
• emqx_retainer
• emqx_management
• emqx_dashboard

# The default EMQX_LOADED_PLUGINS env
EMQX_LOADED_PLUGINS="emqx_recon,emqx_retainer,emqx_management,emqx_dashboard"

For example, load emqx_auth_redis plugin, set it into EMQX_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 EMQX_LOADED_PLUGINS will be loaded.

EMQX_LOADED_PLUGINS="emqx_auth_redis,emqx_recon,emqx_retainer,emqx_dashboard"
EMQX_LOADED_PLUGINS="emqx_auth_redis emqx_recon emqx_retainer emqx_dashboard"
EMQX_LOADED_PLUGINS="emqx_auth_redis | emqx_recon | emqx_retainer | emqx_dashboard"

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

Example:

EMQX_AUTH__REDIS__SERVER   <--> auth.redis.server
EMQX_AUTH__REDIS__PASSWORD <--> auth.redis.password

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

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

Assume you are using redis auth plugin, for example:

#EMQX_AUTH__REDIS__SERVER="redis.at.yourserver"
#EMQX_AUTH__REDIS__PASSWORD="password_for_redis"

docker run --rm -ti --name emqx -p 18083:18083 -p 1883:1883 -p 4369:4369 \
    -e EMQX_LISTENER__TCP__EXTERNAL=1883 \
    -e EMQX_LOADED_PLUGINS="emqx_auth_redis,emqx_recon,emqx_retainer,emqx_management,emqx_dashboard" \
    -e EMQX_AUTH__REDIS__SERVER="your.redis.server:6379" \
    -e EMQX_AUTH__REDIS__PASSWORD="password_for_redis" \
    -e EMQX_AUTH__REDIS__PASSWORD_HASH=plain \
    emqx:latest

You can specify a initial cluster and join.

Note: You must publsh port 4369, 5369 and range of port 6000-6999 for EMQ X Cluster.

For example, using 6000-6100 for cluster.

docker run --rm -ti --name emqx -p 18083:18083 -p 1883:1883 -p 4369:4369 -p 6000-6100:6000-6100 \
    -e EMQX_NAME="emqx" \
    -e EMQX_HOST="t.emqx.io" \
    -e EMQX_LISTENER__TCP__EXTERNAL=1883 \
    -e EMQX_JOIN_CLUSTER="[email protected]" \
    emqx:latest

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 emqx -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 \
    emqx:latest

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

@je-al emqx/emqx-docker#2 The idea of variable names get mapped, dots get replaced by __.