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

Colin Walters walters at verbum.org
Tue Mar 11 23:48:52 UTC 2014

On Tue, Mar 11, 2014 at 5:17 PM, James Slagle <jslagle at redhat.com> 
> How is it incompatible with packaging? The read only root support that
> already exists in Fedora today is what would be used. 

In that /etc and /var are read-only.  Now you're right, there is 
read-only root which makes sense for certain cases, but changing the OS 
content to write to a special data partition is taking one farther away 
from the generality of the package/FHS model.

> How do the images get built? Can you use existing image building 
> tools, or it
> something ostree specific?

The trees (not images) get composed using rpm-ostree.  It's just a 
wrapper around yum --installroot + ostree commit.

 From there after Anaconda support lands, one can install a tree (just 
like a set of packages) into a disk image or bare metal.  In this 
model, Anaconda will be doing far less - it'll just be copying data, 
not depsolving or running through the SELinux labeling, etc.

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