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

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What is going on with this Change Request?  Any reason it has not been
acted on at this point?  We are putting changes into our packages
assuming that this will be allowed.


On 01/06/2017 05:08 PM, Igor Gnatenko wrote:
> On Fri, Jan 6, 2017 at 9:29 PM, Daniel J Walsh <dwalsh@xxxxxxxxxx> wrote:
>> https://fedoraproject.org/wiki/Changes/DockerOverlay2
> Thanks! Note, that you will need to send it for wrangler.
>>
>> On 01/06/2017 02:27 PM, Igor Gnatenko wrote:
>>
>> Shouldn't this be submitted as a change?
>>
>> This would bring much more visibility to users of Fedora and even outside.
>>
>> -Igor Gnatenko
>>
>> On Jan 6, 2017 8:13 PM, "Daniel J Walsh" <dwalsh@xxxxxxxxxx> 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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>>
>>
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>>
>>
>
>
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