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Excerpts from Sean Dague's message of 2013-12-19 16:33:12 -0800:
> So a few people had been reporting recently that unstack no longer stops
> nova processes, which I only got around to looking at today. It turns
> out the new common.service stack from oslo takes SIGHUP and treats it as
> a restart. Which isn't wrong, but is new, and is incompatible with
> screen (the way we use it). Because we use -X stuff, the resulting -X
> quit sends SIGHUP to the child processes.
> 
> So the question is, are we definitely in a state now where nova services
> can and do want to support SIGHUP as restart?
> 
> If so, is there interest in being able to disable that behavior at start
> time, so we can continue with a screen based approach as well?
> 
> If not, we'll need to figure out another way to approach the shutdown in
> devstack. Which is fine, just work that wasn't expected.
> 

Perhaps if the process is running in the foreground, as it does in
devstack, it should still terminate on SIGHUP rather than restart.