The EMQ broker is cross-platform, which could be deployed on Linux, FreeBSD, Mac, Windows and even Raspberry Pi.


Linux, FreeBSD Recommended.

Installing on Linux

Download CentOS Package from:, and then unzip:


Start the broker in console mode:

cd emqttd && ./bin/emqttd console

If the broker is started successfully, console will print:

starting emqttd on node 'emqttd@'
emqttd ctl is starting...[done]
emqttd trace is starting...[done]
emqttd pubsub is starting...[done]
emqttd stats is starting...[done]
emqttd metrics is starting...[done]
emqttd retainer is starting...[done]
emqttd pooler is starting...[done]
emqttd client manager is starting...[done]
emqttd session manager is starting...[done]
emqttd session supervisor is starting...[done]
emqttd broker is starting...[done]
emqttd alarm is starting...[done]
emqttd mod supervisor is starting...[done]
emqttd bridge supervisor is starting...[done]
emqttd access control is starting...[done]
emqttd system monitor is starting...[done]
http listen on with 4 acceptors.
mqtt listen on with 16 acceptors.
mqtts listen on with 4 acceptors.
http listen on with 4 acceptors.
Erlang MQTT Broker 2.0 is running now
Eshell V6.4  (abort with ^G)

CTRL+C to close the console and stop the broker.

Start the broker in daemon mode:

./bin/emqttd start

Check the running status of the broker:

$ ./bin/emqttd_ctl status
Node 'emqttd@' is started
emqttd 2.0 is running

Or check the status by URL:


Stop the broker:

./bin/emqttd stop

Installing on FreeBSD

Download FreeBSD Package from:

The installing process is same to Linux.

Installing on Mac OS X

We could install the broker on Mac OS X to develop and debug MQTT applications.

Download Mac Package from:

Configure log level in etc/emq.conf, all MQTT messages recevied/sent will be printed on console:

The install and boot process on Mac are same to Linux.

Installing on Windows

Download Package from:

Unzip the package to install folder. Open the command line window and ‘cd’ to the folder.

Start the broker in console mode:

bin\emqttd console

If the broker started successfully, a Erlang console window will popup.

Close the console window and stop the emqttd broker. Prepare to register emqttd as window service.


Cannot register EMQ-2.0 as a windows service.

Install emqttd serivce:

bin\emqttd install

Start emqttd serivce:

bin\emqttd start

Stop emqttd serivce:

bin\emqttd stop

Uninstall emqttd service:

bin\emqttd uninstall

Install via Docker Image

Download EMQ 2.0 Docker Image:

unzip emqttd-docker image:


Load Docker Image:

docker load < emqttd-docker-v2.0

Run the Container:

docker run -itd --net='host' --name emq20 emqttd-docker-v2.0

Stop the broker:

docker stop emq20

Start the broker:

docker start emq20

Enter the running container:

docker exec -it emq20 /bin/sh

Installing From Source

The EMQ broker requires Erlang/OTP R18+ and git client to build:

Install Erlang:

Install Git Client:

Could use apt-get on Ubuntu, yum on CentOS/RedHat and brew on Mac to install Erlang and Git.

When all dependencies are ready, clone the emqttd project from and build:

git clone

cd emq-relx && make

cd _rel/emqttd && ./bin/emqttd console

The binary package output in folder:


TCP Ports Used

1883 MQTT Port
8883 MQTT/SSL Port
8083 MQTT(WebSocket), HTTP API Port
8084 MQTT(WebSocket/SSL), HTTP API Port
18083 Web Dashboard Port

The TCP ports used can be configured in etc/emqttd.config:

## TCP Listener: 1883,, ::1:1883
mqtt.listener.tcp = 1883

## SSL Listener: 8883,, ::1:8883
mqtt.listener.ssl = 8883

## HTTP and WebSocket Listener
mqtt.listener.http = 8083

The 18083 port is used by Web Dashboard of the broker. Default login: admin, Password: public

Quick Setup

Two main configuration files of the EMQ broker:

etc/emq.conf EMQ Broker Config
etc/plugins/*.conf EMQ Plugins’ Config

Two important parameters in etc/emq.conf:

node.process_limit Max number of Erlang proccesses. A MQTT client consumes two proccesses. The value should be larger than max_clients * 2
node.max_ports Max number of Erlang Ports. A MQTT client consumes one port. The value should be larger than max_clients.


node.process_limit > maximum number of allowed concurrent clients * 2 node.max_ports > maximum number of allowed concurrent clients

The maximum number of allowed MQTT clients:

mqtt.listener.tcp = 1883

mqtt.listener.tcp.acceptors = 8

mqtt.listener.tcp.max_clients = 1024


# emqttd       Startup script for emqttd.
# chkconfig: 2345 90 10
# description: emqttd is mqtt broker.

# source function library
. /etc/rc.d/init.d/functions

# export HOME=/root

start() {
    echo "starting emqttd..."
    cd /opt/emqttd && ./bin/emqttd start

stop() {
    echo "stopping emqttd..."
    cd /opt/emqttd && ./bin/emqttd stop

restart() {

case "$1" in
        echo $"Usage: $0 {start|stop}"


chmod +x /etc/init.d/emqttd
chkconfig --add emqttd
chkconfig --list

boot test:

service emqttd start


## erlexec: HOME must be set uncomment ‘# export HOME=/root’ if “HOME must be set” error.