[Lxc-users] Container Filesystem in a file (loopback mount)

[Trent W. Buck]

Andy Billington <andy at andybillington.com>
writes:

> Btrfs-tools says 0.19 as that's what came in from the apt-get. Maybe
> newer btrfs versions may work better, but until they "qualify" for an
> apt-get in Ubuntu LTS, they aren't options.

btrfs-tools version is largely irrelevant, it's a tiny C wrapper to
generate appropriate syscalls -- all the smarts are in the kernel
itself.

$ rmadison -uubuntu,debian btrfs-tools
ubuntu:
 btrfs-tools |      0.8-1 | hardy/universe | source, amd64, i386
 btrfs-tools |     0.18-3 | jaunty/universe | source, amd64, i386
 btrfs-tools |     0.19-3 | karmic/universe | source, amd64, i386
 btrfs-tools |     0.19-8 | lucid/universe | source, amd64, i386
 btrfs-tools | 0.19+20100601-3 |      maverick | source, amd64, i386
 btrfs-tools | 0.19+20100601-3 |         natty | source, amd64, i386
debian:
 btrfs-tools | 0.19+20100601-3 | squeeze      | source, amd64, armel,
   hppa, i386, ia64, mips, mipsel, powerpc, s390, sparc
 btrfs-tools | 0.19+20100601-3 | sid          | source, alpha, amd64,
   armel, hppa, i386, ia64, mips, mipsel, powerpc, s390, sparc
 btrfs-tools | 0.19+20101101-1 | experimental | source, alpha, amd64,
   armel, i386, ia64, mips, mipsel, powerpc, s390, sparc

> ZFS on the other hand has been rock solid in testing in this and other
> scenarios for two years, so the problems I've had are not LXC related,
> they are btrfs problems with the current LTS version of btrfs. Maybe
> someone can get look at getting that upgraded, if there is a stable
> release? But, as I said, digressing ....

btrfs isn't stable.  When it is, you'll need that kernel (e.g. 2.6.38),
not just a new btrfs-tools userland.  So basically for production you
should just be waiting until 12.04 LTS.