Fedora Atomic and Docker Host Image [was Re: Docker Host Image: Requirements?]

Colin Walters walters at verbum.org
Thu Mar 13 14:19:53 UTC 2014

On Wed, Mar 12, 2014 at 12:33 PM, James Slagle <jslagle at redhat.com> 
> But, to be clear, someone* saying the TripleO approach is 
> "incompatible with
> packaging" is equivalent to saying Fedora's builtin readonly root 
> support is
> "incompatible with packaging". 

You are right, I was assuming that what you were talking about was a 
more simplistic "data goes in /mnt/data" type approach.  While the 
readonly root approach is a little hacky (IMO), I would describe it as 
compatible with packaging.
> Is there any similar equivalent for dpkg, like a dpkg-ostree? 

There is one I know of, but it is not public.  I don't think it's 
secret sauce, so I may ping the people to ask it be opened up.

> My personal opinion is that TripleO, and OpenStack in general, should 
> offer
> differing implementations where it makes sense. Things like the Nova 
> driver
> model, storage backends, etc. I'd like to see TripleO offer such 
> choices as
> well where it makes sense.

I would say that some level of duplication of effort is unavoidable.  
TripleO can't depend on OSTree (for example, I'm sure TripleO targets 
EL6), and neither can OSTree depend on TripleO (since it needs to 
support non-cloud bare metal).

The key is just to make sure that duplication is minimized and that 
when both features are available, they work in concert as much as 

I'm certainly very interested in having OSTree work well in the cloud 
space.  As we discussed before, while in many ways if one does things 
"right" in cloud, some of the OSTree features such as preserving the 
traditional /etc and /var aren't necessary.  On the other hand - I'd 
say it's still quite sane to deploy "traditional" servers in a cloud 
environment, and OSTree is useful there too.

> FWIW, I definitely "see the light" so to speak with what ostree has 
> to offer.
> I've been hovering aound different package management solutions for 
> quite a
> while. Besides rpm, I spent a few years working closely with Conary, 
> which you
> mention on your RelatedProjects wiki. Even though I have a limited
> understanding of the ostree implementation, it appears to hit the 
> mark of what
> I see as a very compelling update model.
Thanks! =)  I appreciate that.  
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