Re: [Xen-users] Missing libvirt+libxl functionality (Was: Re: Programmatic administration of Xen machines)

[Andreas Pflug <pgadmin@xxxxxxxxxxxxxxxxx>]

Am 04.01.16 um 13:13 schrieb Ian Campbell:
> On Mon, 2016-01-04 at 12:47 +0100, Andreas Pflug wrote:
>> Am 04.01.16 um 12:36 schrieb Ian Campbell:
>>> Sorry to hijack this thread.
>>>
>>> On Mon, 2015-12-28 at 12:56 +0100, Andreas Pflug wrote:
>>>> Actually, I find virsh a bad idea since its support for the new xl
>>>> interface isn't feature complete as the old xm interface was. I had
>>>> to
>>>> realize this the hard way when my virsh based python tools didn't
>>>> work
>>>> as expected after upgrading from xm to xl.
>>> Note that virsh speaks to libxl directly, not via xl.
>>>
>>> Please can you list the functionality of libvirt's libxl backed which
>>> is
>>> missing compared to the old xend based one? 
>> libvirt only handles domains created through it, i.e. using xl at the
>> same time is incompatible. Since dom0 can't be created using libvirt,
>> it's missing from "virsh list" in any case.
> This works for me with a reasonably modern set of bits:
>
>     root@marilith-n0    :~# virsh list
>      Id    Name                           State
>     ----------------------------------------------------
>      0     Domain-0                       running
>      13    d                              running
>
> It probably requires the correct running of xen-init-dom0 during boot
> (likely via the xencommons initscript).
>
> I could believe it was broken at some point in history though.
>
>>  libvirt stores its own state, not using libxl/xenstore stuff.
> Please can you elaborate.
I tested on Debian with 4.4.1 and xl toolstack. See the author's blog post:
https://blog.xenproject.org/2014/01/17/libvirt-support-for-xens-new-libxenlight-toolstack/

I had even more trouble, e.g. I wasn't able to use non-standard block
scripts (neither via /etc/xen/scripts/block-XXX nor via a script
parameter) which are mandatory for me.


Regards,
Andreas
>
> Ian.


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