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Mosquitto MQTT Broker on Docker Image.


mosquitto v1.4.10

This version implement MQTT over WebSocket. You can use an MQTT JavaScript library to connect, like Paho:

It has the auth plugin included. It uses (and is compiled with) support for a Redis and http backends. The additional config for this plugin (sample auth-plugin.conf included) can be bind mounted in the extended configuration directory: /etc/mosquitto.d. Any file with a .conf extension will be loaded by mosquitto on startup.

For details on the auth plugin configuration, refer to the author repository. A little quick&dirty example its included at the end.

The docker images builds with Official Alpine Linux 3.4.


Use the provide Makefile to build the image.

Alternatively you can start it by means of docker-compose: docker-compose up. This is useful when testing. It start up redis and link it to mosquitto so you can test the auth-plugin easily.

Build the Mosquitto docker image

$ sudo make

You can specify your repository and tag by

$ sudo make REPOSITORY=my_own_repo/mqtt TAG=v1.4.10

Default for REPOSITORY is jllopis/mosquitto (should change this) and for TAG is mosquitto version (1.4.10 now).

Actually the command executed by make is

docker build --no-cache -t jllopis/mosquitto:v1.4.10 .

Persistence and Configuration

If you want to use persistence for the container or just use a custom config file you must use VOLUMES from your host or better, data only containers.

The container has three directories that you can use:

  • /etc/mosquitto to store mosquitto configuration files

  • /etc/mosquitto.d to store additional configuration files that will be loaded after /etc/mosquitto/mosquitto.conf

  • /var/lib/mosquitto to persist the database

The logger outputs to stderr by default.
See the following examples for some guidance:

Mapping host directories

$ sudo docker run -ti \
  -v /tmp/mosquitto/etc/mosquitto:/etc/mosquitto \
  -v /tmp/mosquitto/etc/mosquitto.d:/etc/mosquitto.d \
  -v /tmp/mosquitto/var/lib/mosquitto:/var/lib/mosquitto
  -v /tmp/mosquitto/auth-plug.conf:/etc/mosquitto.d/auth-plugin.conf
  --name mqtt \
  -p 1883:1883 \
  -p 9883:9883 \

Data Only Containers

You must create a container to hold the directories first:

$ sudo docker run -d -v /etc/mosquitto -v /etc/mosquitto.d -v /var/lib/mosquitto --name mqtt_data busybox /bin/true

and then just use VOLUMES_FROM in your container:

$ sudo docker run -ti \
  --volumes-from mqtt_data \
  --name mqtt \
  -p 1883:1883 \
  -p 9883:9883 \

The image will save its auth data (if configured) to redis. You can start and link a redis container or use an existing redis instance (remember to configure the plugin).

The included docker-compose.yml file is a good example of how to do it.

Example of authenticated access

By default, there is an admin superuser added to auth-plugin.conf. We will use it as an example.

1. Start a Redis instance

$ sudo docker run -d \
  --name redis_1 \
  -p 6379 \
  -v ${PWD}/tmp/redis-data:/data

2. Start mosquitto with the linked redis

$ sudo docker run -d \
  -v ${PWD}/mosquitto/etc/mosquitto:/etc/mosquitto \
  -v ${PWD}/mosquitto/etc/mosquitto.d:/etc/mosquitto.d \
  -v ${PWD}/mosquitto/var/lib/mosquitto:/var/lib/mosquitto
  -v ${PWD}/mosquitto/auth-plug.conf:/etc/mosquitto.d/auth-plugin.conf
  --name mqtt \
  -p 1883:1883 \
  -p 9883:9883 \
  --link \

3. Add a password for the admin user

(or whatever user u have configured...)

$ docker run -ti --rm jllopis/mosquitto:v1.4.10 np -p secretpass

$ docker run -it --link redis_1:redis --rm redis sh -c 'exec redis-cli -h "$REDIS_PORT_6379_TCP_ADDR" -p "$REDIS_PORT_6379_TCP_PORT"'> SET admin PBKDF2$sha256$901$5nH8dWZV5NXTI63/$0n3XrdhMxe7PedKZUcPKMd0WHka4408V

4. Subscribe to a test channel

$ mosquitto_sub -h localhost -t test

5. Publish to test channel

$ mosquitto_pub -h localhost -t test -m "sample pub"

And... nothing happens becouse our anonymous user have no permission on that channel. Check the mosquitto logs:

mosquitto_1 | 1437183848: New connection from on port 1883.
mosquitto_1 | 1437183848: New client connected from as mosqpub/14736-MacBook-P (c1, k60).
mosquitto_1 | 1437183848: Sending CONNACK to mosqpub/14736-MacBook-P (0, 0)
mosquitto_1 | 1437183848: |-- mosquitto_auth_acl_check(..., mosqpub/14736-MacBook-P, anonymous, test, MOSQ_ACL_WRITE)
mosquitto_1 | 1437183848: |-- user anonymous was authenticated in back-end 0 (redis)
mosquitto_1 | 1437183848: |-- aclcheck(anonymous, test, 2) AUTHORIZED=0 by redis
mosquitto_1 | 1437183848: |--  Cached  [9B6BD92B391C9366FC67942CE0020635A2E289AD] for (mosqpub/14736-MacBook-P,anonymous,2)
mosquitto_1 | 1437183848: |--  Cleanup [D45B453EA5A7900B66AD58FC314C28CD515C1572]
mosquitto_1 | 1437183848: Denied PUBLISH from mosqpub/14736-MacBook-P (d0, q0, r0, m0, 'test', ... (10 bytes))
mosquitto_1 | 1437183848: Received DISCONNECT from mosqpub/14736-MacBook-P

Cool!! Lets try again:

$ mosquitto_pub -h localhost -t test -m "sample pub" -u admin -P secretpass

see the logs:

mosquitto_1 | 1437183987: New connection from on port 1883.
mosquitto_1 | 1437183987: |-- mosquitto_auth_unpwd_check(admin)
mosquitto_1 | 1437183987: |-- ** checking backend redis
mosquitto_1 | 1437183987: |-- getuser(admin) AUTHENTICATED=1 by redis
mosquitto_1 | 1437183987: New client connected from as mosqpub/14767-MacBook-P (c1, k60, u'admin').
mosquitto_1 | 1437183987: Sending CONNACK to mosqpub/14767-MacBook-P (0, 0)
mosquitto_1 | 1437183987: |-- mosquitto_auth_acl_check(..., mosqpub/14767-MacBook-P, admin, test, MOSQ_ACL_WRITE)
mosquitto_1 | 1437183987: |-- aclcheck(admin, test, 2) GLOBAL SUPERUSER=Y
mosquitto_1 | 1437183987: |--  Cached  [CB67C9EA1CEA7676A1B3667076C142A05E1A6C94] for (mosqpub/14767-MacBook-P,admin,2)
mosquitto_1 | 1437183987: Received PUBLISH from mosqpub/14767-MacBook-P (d0, q0, r0, m0, 'test', ... (10 bytes))
mosquitto_1 | 1437183987: |-- mosquitto_auth_acl_check(..., mosqsub/14237-MacBook-P, anonymous, test, MOSQ_ACL_READ)
mosquitto_1 | 1437183987: |-- user anonymous was authenticated in back-end 0 (redis)
mosquitto_1 | 1437183987: |-- aclcheck(anonymous, test, 1) AUTHORIZED=0 by redis
mosquitto_1 | 1437183987: |--  Cached  [6E2BE05D56B509A1912C1A6921B4AEFE80A498CA] for (mosqsub/14237-MacBook-P,anonymous,1)
mosquitto_1 | 1437183987: Received DISCONNECT from mosqpub/14767-MacBook-P

Much better... But, did you get any output in the mosquitto_sub? None. Try this and replay:

$ mosquitto_sub -h localhost -t test -u admin -P secretpass

And now everything should work! ;)


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