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. Yes, idea is basically that with overlay2 continuously improving upstream, it might be at a stage where pros of overlay2 might outweight its cons for lot of people. And if does not, then provide and easy way for users to switch back to devicemapper. With overlay2 being default, it will also provide with some data about how well it works for various workloads. Vivek > 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. _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx
