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Re: [Libguestfs] Fedora 18 / Rawhide switch over to using libvirt as the back end

On Sun, Aug 19, 2012 at 10:05:28PM +0100, Richard W.M. Jones wrote:
> Just a note [possibly more of a warning] that I'm intending to switch
> the default backend in Fedora 18+ to libvirt this week.  For more
> information about what this means, see:
>   https://rwmj.wordpress.com/2012/07/23/new-in-libguestfs-use-libvirt-to-launch-the-appliance/#content
> Barring any bugs, the change ought to be transparent.  The reasons why
> we're making this change in Fedora are:
>  - Because in RHEL 7 this will be the default and we want to test it.
>  - Improved encapsulation and security through sVirt.
>  - Allows us to implement advanced features, especially disk
>    hotplugging and access to remote disks.
> Note there's no change upstream.  libvirt still isn't required.

It took a while, but this should happen today.

  In Rawhide: libguestfs >= 1.19.36-1.fc19
      In F18: libguestfs >= 1.19.36-1.fc18

To tell if your version of libguestfs uses libvirt do:

  $ guestfish get-attach-method

(If it prints 'appliance' instead of 'libvirt', then it's using the
non-libvirt direct launch method).

There ought to be no user-visible change.  If you want you can switch
back to using the direct launch method by doing:


If you want to change the libvirt URI used, do something like:

  export LIBGUESTFS_ATTACH_METHOD=libvirt:qemu:///system

(It sounds tempting, but this won't let you use Xen etc, although it
is now plausible that someone could patch libguestfs to make that work.)


Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
virt-df lists disk usage of guests without needing to install any
software inside the virtual machine.  Supports Linux and Windows.

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