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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