如何在任务定义中为 AWS ECS 上运行的 mosquitto-eclipse 配置健康检查？

Question

Right now i have deployed mosquitto-eclipse successfully on Amazon ECS but i want to configure health checks in the task definition

Note mosquitto uses port 1883 and port 9001

Issue

commands like curl are not installed in the mosquitto-eclipse image,so something like

CMD-SHELL curl -f http://localhost:1883 || exit 1

wont work because curl is not installed

question

how do i correctly health check my mqtt mosquitto from the task definition ?

tried

/ # wget --quiet --spider --tries=1 "http://localhost:9001"

but i get this error

wget: error getting response: Address not available

also something worth mentioning i have username and password set up in mosquitto say

username:abc

password:xyz

so maybe that is why wget is failing ? if so how do i specify the username and password in wget ?

Answer 1

The short answer is, you don't. HealthChecks are what are run against your container by another service. For instance your ALB load balancer to decide if the container task is healthy and to route traffic there. You don't make requests to your container from inside your container, that's the end of the story.

However, nothing stops you have from having an health check endpoint in your service which returns data when requested. You would need to compose a container which runs two services, the Mosquitto and a second webservice to monitor the container.

However, based on what you are looking for, you should be monitoring the service from outside of the ECS task. You can either deploy another task or use the built in metrics/alarms to determine how to adjust the autoscaling when necessary. Don't build your own solution.

Further, you don't and shouldn't deploy mosquitto to AWS, because AWS already natively supports MQTT message brokers via Amazon MQ service