docker-compose.yml is overridden every reboot about azure-docker-extension

[ahmetb]

@dmoreno it's expected behavior. This extension should be used for bootstrapping an initial set of containers (an immutable set, to be precise) such as monitoring, cluster management, security etc.

Once the extension is deployed you should use docker client or docker-compose directly against your docker daemon to launch/manage containers.

[dmoreno]

Thanks for the answer, @ahmetalpbalkan. I got your point.

This azure-docker-extension is used in the official Jenkins Virtual Machine provided by Docker in Azure Marketplace to launch the Jenkins container with a fixed configuration. And with this behavior is very difficult to modify the running container, for example, to attach new volumes.

In your opinion, is this use of the extension correct?

[ahmetb]

@dmoreno

<personal opinion>
I think having Container Apps on Azure Marketplace was a bad idea. (1) We are not actually letting people configure anything useful. (2) We're not teaching people docker, we just do something for them. (3) It runs one container per VM = pointless. (4) It often produces unseeable/unobservable results, such as starting Redis container that's closed to public internet has no visible effect, so users feel like "so, what happened now?".

I can continue keep going. So please don't use Container Apps section in Azure Marketplace if you actually know what you're doing. It sounds like you know how to use docker and run a container just fine on your own. Running a jenkins container from docker CLI is very simple (docs) and the Marketplace experience just complicates things and adds no real value in your case.

If you still want to use DockerExtension to create a Jenkins container, I suggest creating an Azure Resource Manager template with DockerExtension and configuring Jenkins in it the way you want it.
</personal opinion>

[dmoreno]

Thanks for your opinion, @ahmetalpbalkan. I totally agree with you.

I think "Docker on Ubuntu Server" Virtual Machine in Azure catalog (provided by Canonical + Microsoft) seems more useful if you know what you are doing. It uses azure-docker-extension too.