Open Stack

On Nov 23, 2013, at 2:39 PM, Robert Collins <robertc at robertcollins.net>
 wrote:

> On 24 November 2013 05:42, Clayton Coleman <ccoleman at redhat.com> wrote:
> 
>>> Containers will work fine in diskimage-builder. One only needs to hack
>>> in the ability to save in the container image format rather than qcow2.
>> 
>> That's good to know.  Will diskimage-builder be able to break those down into multiple layers?
> 
> What do you mean?

Docker images can be layered. You can have a base image on the bottom, and then an arbitrary number of deltas on top of that. It essentially works like incremental backups do. You can think of it as each "layer" has a parent image, and if they all collapse together, you get the current state. Keeping track of past layers gives you the potential for rolling back to a particular restore point, or only distributing incremental changes when you know that the previous layer is already on the host.

> 
> -Rob
> 
> 
> -- 
> Robert Collins <rbtcollins at hp.com>
> Distinguished Technologist
> HP Converged Cloud
> 
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