[colug-432] Union filesystems on CentOS 7

[Zach Villers]

Phil,

It sounds like you may want something like the ZFS file system used by
FreeBSD, Illumos, OpenIndiana, as well as being available as a separate rpm
from the ZFS on linux page.

Because ZFS is licensed under CDDL, I found it a headache to work with
under Fedora (I usually run whatever beta or rawhide though). Because
Fedora believes that the CDDL license conflicts with whatever GPL the linux
kernel is licensed as, it requires working with dkms each time you have a
kernel upgrade, which i personally find to be not worth the hassle.

I beleive ubuntu offers zfs in a PPA, Arch has it either in the AUR or in
their main packages, Debian may also include zfs in their packages.

While zfs may not exactly be an overlay fs like you describe, i think it
might fit your use case. Here are some slides that I thought of when you
mentioned developers working with media without interrupting production;

http://allanjude.com/talks/vBSDCon2015_-_Interesting_ZFS.pdf


On Tue, Oct 13, 2015 at 2:44 PM, Phil Harris <philtech at gmail.com> wrote:

> I'm researching union/overlay type filesystems for CentOS 7.  A union
> filesystem is one that mounts multiple underlying filesystems together in a
> single "union" mount, presenting one complete view.  Usually, one layer is
> writable, while other layers are read-only.  These are useful for things
> like booting of a read-only CD/DVD image.  My use case would be using such
> a filesystem in providing media to a website, allowing developers to access
> and change media while not disturbing production.
>
> So far, it seems that there isn't any such filesystem package in the
> CentOS repositories.  While CentOS 7 uses the Linux 3.10 kernel, Linux
> itself does not provide native kernel support for overlay filesystems until
> Linux 3.18.
>
> I know there are several package that are available outside of the
> official repos.  Does anyone have experience with such packages or
> filesystems, preferably in a Red Hat/CentOS environment?
>
> Thanks,
> Phil
>
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