[lxc-devel] [PATCH] Use container specific domain socket name

[Dwight Engen]

On Tue, 16 Apr 2013 08:52:56 -0500
Serge Hallyn <serge.hallyn at ubuntu.com> wrote:

> Quoting S.Çağlar Onur (caglar at 10ur.org):
> > Hi Serge,
> > 
> > I was just following your lead as you said you don't wan't any long
> > running monitor daemon :)
> 
> Yup, at this point I"m going for the least bad solution.  (since the
> best solution, multicast af_unix, isn't possible :)
> 
> > Also I'm not sure how does that daemon is going to help
> > starting multiple containers concurrently using only API. I'm
> > guessing the first request will cause that daemon to start and it
> > will never end unless specifically told it to shutdown?
> 
> So basically,
> 
>   c1  -                                --> m1
>         \                             /
>   c2  ----->  "\0$lxcpath" Daemon -------> m2
>         /                             \
>   c3  -/                               --> m3
> 
> m1 is the first lxc-monitor someone started.  It sees that
> "\0$lxcpath" is not bound, so fires off a long-running daemon
> listening for events on "\0$lxcpath", and doing listen/accept at
> "\0$lxcpath.M".  Then m1 connects to to that daemon on "\0$lxcpath.M"
> and listens for events.  m2 starts, connects to "\0$lxcpath.M", and
> listens for events.  m3. does the same.  m1 exits, but the daemon
> continues.

The daemon could keep track of how many monitors are connected and
exit when the count drops to zero (after waiting some small amount of
time for a new monitor connection which also handles the initial
startup case).

This daemon isn't queuing right? So we define that when there is no
monitor connected, all events are dropped.

> c1 starts up, simply sends events as it does not to "\0$lxcpath".  If
> that socket doesn't exist it ignores it.  If it's busy, it resends.
> 
> I won't be surprised if/when there turn out to be AF_UNIX-specific
> reasons why we can't do this.
> 
> -serge
> 
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