Re: How to use xl (in place of xm) with libvirt 1.0.2 and Xen 4.2.1 in Ubuntu 13.04?

[Gizmo Chicken <gizmochicken@xxxxxxxxx>]

Hi Jim,

Thanks much for suggestions.  And please accept my apologies for not replying sooner.  Your reply got buried in lots of other list-serve messages.

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

I'm a bit new at this, but I was under the impression that setting setting toolstack=xl in /etc/default/xen would prevent xend from starting.  That is, I thought that xend wouldn't start when xl was running.  Am I totally wrong about that? 

In any case, xl is running and if I try to send an xm command, I get the following:  "A different toolstack (xl) has been selected!"  Is there something else that I should try to insure that xend isn't running?

(As a reminder, if I set toolstack=xm in /etc/default/xen, virt-manager works great.  But I'm hoping to use the xl toolstack.)

You asked:  "Did the libxl driver even load?  There should be some evidence of that in libvirtd.log."

My libvirtd.log doesn't seem provide any evidence of that the libxl driver is loaded.  (See log copied below.)  But libvirtd.log does mention an "internal error failed to connect with xend."  So honestly, I'm not quite sure whether libxl loaded. What's the best way to confirm?

You asked:  "Has your libvirt package been built with the libxl driver enabled?"

I'm using the libvirt package that is available from the Ubuntu 13.04 (and now 13.10) repository.  How would I go about checking whether that package was built with the libxl driver enabled?

Thanks so much for any additional help you can provide!

Best regards,

GizmoChicken


var/log/libvirt/libvirtd.log

2013-05-18 05:44:47.614+0000: 1304: info : libvirt version: 1.0.5
2013-05-18 05:44:47.614+0000: 1304: error : xenHypervisorDoV2Sys:1006 : Unable to issue hypervisor ioctl 3166208: Permission denied
2013-05-18 05:44:47.615+0000: 1304: error : xenHypervisorDoV2Sys:1006 : Unable to issue hypervisor ioctl 3166208: Permission denied
2013-05-18 05:44:47.617+0000: 1304: error : xenHypervisorDoV2Sys:1006 : Unable to issue hypervisor ioctl 3166208: Permission denied
2013-05-18 05:44:47.618+0000: 1304: error : xenHypervisorDoV2Sys:1006 : Unable to issue hypervisor ioctl 3166208: Permission denied
2013-05-18 05:44:47.618+0000: 1304: error : xenHypervisorDoV2Sys:1006 : Unable to issue hypervisor ioctl 3166208: Permission denied
2013-05-18 05:44:47.619+0000: 1304: error : xenHypervisorDoV2Sys:1006 : Unable to issue hypervisor ioctl 3166208: Permission denied
2013-05-18 05:44:47.635+0000: 1304: error : do_connect:103 : internal error failed to connect to xend
2013-05-18 05:44:47.636+0000: 1304: error : xenDaemonOpen_tcp:700 : unable to connect to 'localhost:8000': Connection refused
2013-05-18 05:45:13.647+0000: 1289: error : virNetSocketReadWire:1362 : Cannot recv data: Connection reset by peer

On Mon, Apr 1, 2013 at 9:21 AM, Jim Fehlig <jfehlig@xxxxxxxx> wrote:

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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