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signalfx / maestro-ng

Orchestration of Docker-based, multi-host environments
https://signalfx.com
Apache License 2.0
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add exec command #136

Open ivotron opened 9 years ago

ivotron commented 9 years ago

It would be nice if one could execute an arbitrary command on a container (using docker-py's exec_create, exec_run and exec_inspect). Something like:

maestro exec <container-id> echo "hello world"
mpetazzoni commented 9 years ago

I'm torn on this. On the one hand, I can see the benefit of letting Maestro take care of figuring out where <container> is running for you, making it easier to execute a command inside that container amongst all your running containers.

On the other hand, the goal of Maestro is not to be a replacement command-line.

ivotron commented 9 years ago

I agree on the latter. Having to execute commands on containers might be an indication that containers are not being used properly. This is kind of equivalent to running sshd https://jpetazzo.github.io/2014/06/23/docker-ssh-considered-evil/ in a container.

having said this, there are times (e.g. in a dev environment) when you just want to lunch a command for very ad-hoc reasons. As you mentioned, this automates the task of figuring out the host IP/port and then executing docker directly on the CLI.

The particular use case that I have in mind is to add support for docker in teuthology https://github.com/ceph/teuthology (the Ceph integration testing framework) which relies on being able to launch commands remotely. The problem is that the tool tests multiple deployments (bare-metal and VMs), relying on SSH to orchestrate tasks across the ceph cluster.