Raspberry Pi: Running Mosquitto MQTT server

Environment

• Raspberry Pi 3 Model B

Install and run as service

Taken from YouTube.

Installation

$ sudo apt-get update
$ sudo apt-get dist-upgrade
### Install mosquitto
$ sudo apt-get install mosquitto
### Optional - install mosquitto clients
$ sudo apt-get install mosquitto-clients

Install and run in Docker container

Based on this.

install docker

### Install Docker
$ curl -fsSL get.docker.com -o get-docker.sh
$ sudo sh get-docker.sh

### Pull Mosquitto image
$ docker pull eclipse-mosquitto

RUN with default configuration

$ docker run -it -p 1883:1883 -p 9001:9001 --restart unless-stopped eclipse-mosquitto

run with custom mosquitto configuration

Say, we want to persist Mosquitto log in local file system

• create local mosquitto.conf (e.g. at /home/pi/mosquitto/config/mosquitto.conf location)
• add this line to it:

log_dest /mosquitto/log/mosquitto.log

Then run the container:

$ docker run -it -p 1883:1883 -p 9001:9001 --restart unless-stopped -v /home/pi/mosquitto/config/mosquitto.conf:/mosquitto/config/mosquitto.conf -v /mosquitto/log eclipse-mosquitto

Inspect the container:

### Figure out container id
$ docker ps
CONTAINER ID IMAGE             COMMAND                CREATED...
4aaf067565c9 eclipse-mosquitto "/docker-entrypoint.…" 14 minutes...

### Inspect rge container
$ docker inspect 4aaf067565c9
...
"Mounts": [
            {
                "Type": "bind",
                "Source": "/home/pi/mosquitto/config/mosquitto.conf",
                "Destination": "/mosquitto/config/mosquitto.conf",
                "Mode": "",
                "RW": true,
                "Propagation": "rprivate"
            },
            {
                "Type": "volume",
                "Name": "7cbeec58f1dee862c14b65b1ab59b180df1ec5fc4736a0a88136a28c88e5e68c",
                "Source": "/var/lib/docker/volumes/7cbeec58f1dee862c14b65b1ab59b180df1ec5fc4736a0a88136a28c88e5e68c/_data",
                "Destination": "/mosquitto/log",
                "Driver": "local",
                "Mode": "",
                "RW": true,
                "Propagation": ""
            },
            {
                "Type": "volume",
                "Name": "e5f9ff21ba6a94a84347bcf6aa7203e510db1ea578da63cbe8ce256d96b44914",
                "Source": "/var/lib/docker/volumes/e5f9ff21ba6a94a84347bcf6aa7203e510db1ea578da63cbe8ce256d96b44914/_data",
                "Destination": "/mosquitto/data",
                "Driver": "local",
                "Mode": "",
                "RW": true,
                "Propagation": ""
            }
        ],
...

### Check log file
$ sudo cat /var/lib/docker/volumes/7cbeec58f1dee862c14b65b1ab59b180df1ec5fc4736a0a88136a28c88e5e68c/_data/mosquitto.log
1548170247: mosquitto version 1.5.5 starting
1548170247: Config loaded from /mosquitto/config/mosquitto.conf.
1548170247: Opening ipv4 listen socket on port 1883.
1548170247: Opening ipv6 listen socket on port 1883.
...

See more on how to run mosquitto in docker container here.

Testing

### Console 1
$ mosquitto_sub -t "hellomosquitto"

### Console 2
$ mosquitto_pub -t "hellomosquitto" -m "Hello, Mosquitto!"

### Console 1 prints
Hello, Mosquitto!