[virt-tools-list] How to use xl (in place of xm) with libvirt 1.0.2 and Xen 4.2.1 in Ubuntu 13.04?

[Jim Fehlig]

Gizmo Chicken wrote:
> QUESTION:  What, if anything, can I do so that I can use xl (in place
> of xm) with libvirt 1.0.2 and Xen 4.2.1 in Ubuntu 13.04?

Ensure xend is *not* running and then restart libvirtd.  The libvirt
libxl driver will only load when xend is not running.

>
> BACKGROUND:  I am testing a fully updated (as of March 27)
> installation of Ubuntu 13.04 that includes the following packages:
>
> libvirt - version 1.0.2-0ubuntu9
> xen-hypervisor-4.2-amd64 - version 4.2.1-0ubuntu1
>
> Upon setting TOOLSTACK=xm in /etc/default/xen (as well as making a few
> needed tweaks to /etc/xen/xend-config.sxp), libvirt and virt-manager
> worked great.  Yippee!
>
> I guess that I should be happy that the xm toolstack still works with
> Xen 4.2.1 and quit while I'm ahead, but...
>
> According to libvirt's documentation:
>
> "libxl: Starting with Xen 4.2, the legacy XenD/xm toolstack is
> deprecated in favor of libxl, also commonly called libxenlight.
> libvirt supports this new Xen toolstack via the libxl driver. If XenD
> is enabled, the legacy xen driver consisting of the above mentioned
> channels will be used. If XenD is disabled, the libxl driver will be
> used." 
>
> See http://libvirt.org/drvxen.html.
>
> In view of the above, I attempted to use xl in place xm by setting
> TOOLSTACK=xl in /etc/default/xen.   And after doing so (both with and
> without, the above mentioned tweaks to /etc/xen/xend-config.sxp), I
> recieved the following error when attempting to start virt-manager:
>
> Unable to connect to libvirt.
>
> unable to connect to 'localhost:8000': Connection refused

Did the libxl driver even load?  There should be some evidence of that
in libvirtd.log.  Has your libvirt package been built with the libxl
driver enabled?

Regards,
Jim

>
> Verify that:
>  - A Xen host kernel was booted
>  - The Xen service has been started
>
> Libvirt URI is: xen:///
>
> Traceback (most recent call last):
>   File "/usr/share/virt-manager/virtManager/connection.py", line 1027,
> in _open_thread
>     self.vmm = self._try_open()
>   File "/usr/share/virt-manager/virtManager/connection.py", line 1009,
> in _try_open
>     flags)
>   File "/usr/lib/python2.7/dist-packages/libvirt.py", line 102, in
> openAuth
>     if ret is None:raise libvirtError('virConnectOpenAuth() failed')
> libvirtError: unable to connect to 'localhost:8000': Connection refused
>
>
>
>
>
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