Re: register runsvdir as subreaper

From: John Regan <>
Date: Thu, 2 Feb 2017 15:52:28 -0600

On 02/02/2017 03:29 PM, Mitar wrote:
> Hi!
> Hm, when I read the runit man page I got scared because of its trying
> to reboot and halt the machine. I am not sure how will that interact
> with a Docker container. I also didn't want one extra process to be in
> every container. But you are right, it seems it might be necessary
> anyway.
> So, let 'see. I could simply then use runit as PID 1 inside a Docker
> image. /etc/runit/1 could be an empty script (is it even required to
> have it, if not needed?). /etc/runit/2 would then start runsvdir.
> Should it exec into it?
> I would then map Docker stop signal to be SIGINT, and I would create a
> /etc/runit/ctrlaltdel script which would gracefully call stop on all
> services. Or does runit already do that?
> If /etc/runit/stopit does not exit, then sending the SIGINT signal to
> runit does not do anything besides running the /etc/runit/ctrlaltdel
> script?
> Mitar

I'm going to really recommend checking out the s6-overlay, I think it
will do everything you're talking about out-of-the-box. No need to
customize the Docker stop signal, it handles gracefully shutting
down services, reaping orphaned processes, and so on. It's really
useful and will probably save you a lot of time.

-John Regan
Received on Thu Feb 02 2017 - 21:52:28 UTC

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