As well as being available as packages that can be installed directly into the operating systems, VerneMQ is also available as a Docker image. Below is an example of how to set up a couple of VerneMQ nodes using Docker.
docker run --name vernemq1 -d erlio/docker-vernemq
Somtimes you need to configure a forwarding for ports (on a Mac for example):
docker run -p 1883:1883 --name vernemq1 -d erlio/docker-vernemq
This starts a new node that listens on 1883 for MQTT connections and on 8080 for MQTT over websocket connections. However, at this moment the broker won't be able to authenticate the connecting clients. To allow anonymous clients use the
DOCKER_VERNEMQ_ALLOW_ANONYMOUS=on environment variable.
docker run -e "DOCKER_VERNEMQ_ALLOW_ANONYMOUS=on" --name vernemq1 -d erlio/docker-vernemq
This allows a newly started container to automatically join a VerneMQ cluster. Assuming you started your first node like the example above you could autojoin the cluster (which currently consists of a single container 'vernemq1') like the following:
docker run -e "DOCKER_VERNEMQ_DISCOVERY_NODE=<IP-OF-VERNEMQ1>" --name vernemq2 -d erlio/docker-vernemq
(Note, you can find the IP of a docker container using
docker inspect <containername/cid> | grep \"IPAddress\").
To check if the above containers have successfully clustered you can issue the
docker exec vernemq1 vmq-admin cluster show +--------------------+-------+ | Node |Running| +--------------------+-------+ |[email protected]| true | |[email protected]| true | +--------------------+-------+
vmq-admin commands are available. See https://vernemq.com/docs/administration/ for more information.