[lxc-devel] lxd: Initial design specifications

[Dwight Engen]

On Fri, 7 Nov 2014 00:39:19 +0000
Serge Hallyn <serge.hallyn at ubuntu.com> wrote:

> Quoting Stéphane Graber (stgraber at ubuntu.com):
> > On Thu, Nov 06, 2014 at 04:03:18PM -0500, Dwight Engen wrote:
> > 
> > Re-reading the examples, except for that specific one, there's
> > nothing that copy can do which start doesn't do too.
> 
> Yeah, Tycho and I noticed that today right after pushing code which
> implemented... create :)
> 
> > So I see two options there and I'm not completely sure which I
> > prefer to be honnest:
> > 1) We drop copy and we add a --later option to the start command.
> > 2) We drop copy and we introduce a create command which is
> > identical to start except that it doesn't start the container and
> > doesn't accept any runtime-specific argument.
> > 
> > My problem with 1) is the obvious conceptual issue that start in
> > that mode won't actually start anything.
> > 
> > My problem with 2) is the addition of a new command just for what
> > may well end up being a corner case.
> 
> So for lxc 1.0 Stéphane worked hard to remove a slew of redundant
> lxc-* commands.  So there's a strong desire to not err that way
> again.  However I think 'lxc start --later' is working too hard to
> avoid having 'lxc create'.  I don't think that create without start
> is a corner case.
> 
> I do agree the semantic overlap is unfortunate.  But having to do
> 'lxc-start --later' to create feels akin to going to the start menu
> to shut down.

I agree start --later is weird. We could just have create, and it could
have a --start option, but that doesn't seem very discover-able. If
we're following a traditional hypervisor model, it seems they all have
separate create vs. start so having start actually create something is
a bit different.

> So I'd vote for adding create.  I'll propose a patch in a few minutes
> to add that to the docs.
> 
> thanks,
> -serge
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