Hi!
Is there a local convention that discussion about containers is using
top-posting?
"Curious"
--alec
On 06/01/17 23:12, Vivek Goyal wrote:
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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