[lxc-devel] [PATCH] Use container specific domain socket name
Dwight Engen
dwight.engen at oracle.com
Tue Apr 16 14:22:09 UTC 2013
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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