Mosquitto Docker Image With Health Checks

Containers built with this Dockerfile pull the Eclipse Mosquitto images and extend them by adding a healthcheck test.

Environment Variables

• HEALTHCHECK_PORT

  By default, a localhost listener on port 1880 is created to serve the healthcheck client. This can be overwritten by setting the HEALTHCHECK_PORT variable, for example:

  • shell

    docker run --rm -it --env=HEALTHCHECK_PORT=1881 -d mosquitto-hc:latest

  • compose.yaml

    ...
    services:
      mosquitto:
        image: mosquitto-hc:latest
        environment:
          HEALTHCHECK_PORT: 1881
        ...

• HEALTHCHECK_USERNAME and HEALTHCHECK_PASSWORD

  By default, a new listener with anonumous login is created to serve the healthcheck client. This can be overwritten by setting the HEALTHCHECK_USERNAME and HEALTHCHECK_PASSWORD variables, in which case, an existing listener will be used instead of creating a new one. For example:

  • shell

    docker run --rm -it --env=HEALTHCHECK_USERNAME=testUser --env=HEALTHCHECK_PASSWORD=testPaswd -d mosquitto-hc:latest

  • compose.yaml

    ...
    services:
      mosquitto:
        image: mosquitto-hc:latest
        environment:
          HEALTHCHECK_USERNAME: testUser
          HEALTHCHECK_PASSWORD: testPaswd
        ...

• HEALTHCHECK_TOPIC

  By default, the healthcheck client subscribes to the $SYS/broker/uptime topic. This can be overwritten by setting the HEALTHCHECK_TOPIC variable. This is useful if an existing listener is used that disables the $SYS hierarchy completely. Note, that subscribing to the selected topic should imidiately return a value, otherwise the healthcheck will time out. For example:

  • shell

    docker run --rm -it --env=HEALTHCHECK_TOPIC=test/topic -d mosquitto-hc:latest

  • compose.yaml

    ...
    services:
      mosquitto:
        image: mosquitto-hc:latest
        environment:
          HEALTHCHECK_TOPIC: test/topic
        ...

Building

Run docker-build.ps1 Powershell or docker-build.sh Bash script to build the latest image, or pass a specific tag (e.g. 2.0.18) to pull and buld that version. For example:

• Powershell

  .\docker-build.ps1
  .\docker-build.ps1 latest
  .\docker-build.ps1 2.0.18

• Bash

  chmod +x ./docker-build.sh
  ./docker-build.sh
  ./docker-build.sh latest
  ./docker-build.sh 2.0.18

To build without using those scripts:

docker build --build-arg TAG=latest -t mosquitto-hc:latest -f Dockerfile .
docker build --build-arg TAG=2.0.18 -t mosquitto-hc:2.0.18 -f Dockerfile .
docker compose build