Linking containers example not working any more

In the section about linking containers the example to link mosquitto by a bridge network dosn't work with mosquitto:latest (2.0.7), but with the last 1.6.13 seams that the config file of Mosquitto 2 is different and not listening to the network by default.

If I look into the container log I get:

1614083867: mosquitto version 2.0.7 starting
1614083867: Config loaded from /mosquitto/config/mosquitto.conf.
1614083867: Starting in local only mode. Connections will only be possible from clients running on this machine.
1614083867: Create a configuration file which defines a listener to allow remote access.
1614083867: Opening ipv4 listen socket on port 1883.
1614083867: Opening ipv6 listen socket on port 1883.
1614083867: Error: Address not available
1614083867: mosquitto version 2.0.7 running

by altering the docker command to:

docker run -itd --network iot --name mybroker eclipse-mosquitto:1.6.13

it works like expected. So two solutions:

1. using the command like above with the last 1.6 Mosquitto
2. Providing an docker image with adapted mosquitto.conf file to enable listener 1883 and allow_anonymous true to have the same behavior for the latest mosquitto.

Dockerfile could look like:

FROM eclipse-mosquitto:latest

RUN echo "listener 1883" >> /mosquitto/config/mosquitto.conf
&& echo "allow_anonymous true" >> /mosquitto/config/mosquitto.conf

VOLUME ["/mosquitto/data", "/mosquitto/log"]

EXPOSE 1883
ENTRYPOINT ["/docker-entrypoint.sh"]
CMD ["/usr/sbin/mosquitto", "-c", "/mosquitto/config/mosquitto.conf"]

Best Christian

Start with the “linking containers” section in the Docker getting-started documentation and reproduce its Mosquitto example using the current image. Compare the result with Mosquitto 1.6.13 and the reported listener configuration. Done means the documented example works with the supported Mosquitto version and clearly includes any required configuration or version pinning.