feature request: stop an exec_run

[rrauenza]

I have a use case where I need to stop an exec_run after starting it over an api. I'm implementing something similar to a healthcheck, but externally, and I need to timeout the healthcheck.

Workarounds would be to use /usr/bin/timeout as part of the exec command or just use /usr/bin/docker exec and kill the process, but it would also be nice to have a way to stop an exec that was started from the api.

edit: reading over moby/moby#9098 ...I need to look and see if my assumptions about killing a docker exec killing the underlying exec.

edit2: WELL... ^C'ing an exec does NOT stop the actual exec. Just the docker process monitoring it.

[rrauenza]

It looks like the Pid is included in the inspect, so it may be possible to kill the exec by issuing another exec in the container:

ex2 = container.client.api.exec_inspect(ex['Id'])
ex2
{'ID': '28bc2ec956ddf05e63ce0b5a8e62a87ac73d6c0e2a87a97ae364a6906c6a67c8', 'Running': True, 'ExitCode': None, 'ProcessConfig': {'tty': False, 'entrypoint': '/bin/sleep', 'arguments': ['1000'], 'privileged': False}, 'OpenStdin': False, 'OpenStderr': True, 'OpenStdout': True, 'CanRemove': False, 'ContainerID': '8087ec8e5d1594e55b0282233ac48a1d7e576523010c5719e3236df5bb524622', 'DetachKeys': '', 'Pid': 25055}

But the pid is the outside pid of the process, not the internal. Which has a problem if managing from within another docker container, or if the manager is not root, but the process is running as root inside the container.