Re: Changing default "docker" storage to to Overlay2 in Fedora 26

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There is more conversation on this issue here.

https://pagure.io/atomic-wg/issue/186

I wished there was a single thread of conversation on this instead of
separate conversation for per product variant.

Thanks
Vivek

On Fri, Jan 06, 2017 at 02:05:49PM -0500, Daniel J Walsh wrote:
> Upstream docker is moving to overlay2 by default for its storage.  We
> plan on following suit.  Their are some performance advantages of
> overlay2 over devicemapper in memory sharing, which we would like to
> take advantage of.   We now have SELinux support for Overlay  file
> systems, so the security should be just as good.
> 
> Note: Overlay is not a Posix Compliant file system, so their could be
> problems with your containers running on overlay, so
> we want to make sure it is fairly easy to switch back to devicemapper.
> 
> Devicemapper out of the box, on Fedora Workstation, currently defaults
> to loopback devices for storage, which has a performance penalty, but
> this was the only way we were able to get docker to work right away. 
> Switching to overlay2 will cause the storage to be shared with / and
> will eliminate this performance overhead.   This is the way we will ship
> Fedora Workstation.
> 
> On Fedora atomic host and Fedora server we have been storing
> devicemapper storage on a separate partition.  We plan on doing the same
> thing with overlay2.  This means separate device will be mounted on
> /var/lib/docker.  This will make it easier for someone to switch back to
> devicemapper, if overlay2 has problems.
> 
> Upgraded systems will not be effected. 
> 
> If you want to switch from one storage to another take a look at the
> `atomic storage` commands.
> 
> We will write up release notes to cover this change. Along with a blog
> explaining the commands to switch back and forth.
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