Install Emqx with docker

Firewall configurations, disable firewalld for quick in this example, you might want add ports through firewall.

systemctl stop firewalld
systemctl disable firewalld

Then make nodes know each other

vim /etc/hosts
192.168.0.227 link1
192.168.0.228 link2

The emqx.conf is config of emqx, content(default ) is huge and you can copy it from flollowing site:

Or you can copy it with docker:

docker run -d --name emqx --rm emqx/emqx
docker cp emqx:/opt/emqx/etc .
docker rm -f emqx

Then start emqx container on each node(change the highlight line according to you nodes):

docker run -tid --name emqx --restart=always --network host \
    -e EMQX_NAME=link1 \
    -e EMQX_HOST=192.168.0.227 \
    -e EMQX_LISTENER__TCP__EXTERNAL=1883 \
    -e EMQX_WAIT_TIME=30 \
    -e EMQX_JOIN_CLUSTER="link1@192.168.0.227" \
    -e EMQX_CLUSTER__NAME=emqxcl \
    -e EMQX_CLUSTER__DISCOVERY=static \
    -e EMQX_CLUSTER__STATIC__SEEDS="link1@192.168.0.227,link2@192.168.0.228" \
    emqx/emqx

Check running status

docker logs -f emqx
cluster.discovery = "static"
cluster.name = "emqxcl"
cluster.static.seeds = "link1@192.168.0.227,link2@192.168.0.228"
listener.ssl.external.acceptors = "32"
listener.ssl.external.max_connections = "102400"
listener.tcp.external = "1883"
listener.tcp.external.acceptors = "64"
listener.tcp.external.max_connections = "1024000"
listener.ws.external.acceptors = "16"
listener.ws.external.max_connections = "102400"
listener.wss.external.acceptors = "16"
listener.wss.external.max_connections = "102400"
log.to = "console"
node.max_ets_tables = "2097152"
node.max_ports = "1048576"
node.name = "link1@192.168.0.227"
node.process_limit = "2097152"
rpc.port_discovery = "manual"
Starting emqx on node link1@192.168.0.227
Start http:management listener on 8081 successfully.
Start http:dashboard listener on 18083 successfully.
Start mqtt:tcp:internal listener on 127.0.0.1:11883 successfully.
Start mqtt:tcp:external listener on 0.0.0.0:1883 successfully.
Start mqtt:ws:external listener on 0.0.0.0:8083 successfully.
Start mqtt:ssl:external listener on 0.0.0.0:8883 successfully.
Start mqtt:wss:external listener on 0.0.0.0:8084 successfully.
EMQ X Broker 4.3.8 is running now!

Check cluster status via

docker exec -it emqx /bin/sh /opt/emqx/bin/emqx_ctl cluster status
Cluster status: #{running_nodes =>
                      ['link1@192.168.0.227','link2@192.168.0.228'],
                  stopped_nodes => []}

Open webbrowser, access site

http://link1.const.cc:18083

user: admin

password: public