This is the targets in my target group. They corresponds to the docker processes running in my ecs service.

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As you can see all processes are marked as either draining or unhealthy.

Here is how I define my Health checks,

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I have tried the health check url on a local docker process and the url works as expected.

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The same log messages are not found incloud watch log. I presume the healthcheck url is not called at all.

Here is my container definition in my task

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As you can see in the above screenshot, I have mapped port 0 to 8090. I believe it is how to enable dynamic mapping.

Also I have set the network mode to 'Bridge'

How can get the health check to work? I think currently it is the reason why I cannot reach the underlying docker processes.


It seems to be an issue with the default security group when I created the ecs cluster

The default SG is

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So basically no traffic can reach the ec2 instance that hosts the docker process.

I added a very permissive security group and it is working and I can reach the healthcheck url

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