Re: [Wg-openstack] [ACTION] Review of OpenStack documentation

[Joao Martins <joao.m.martins@xxxxxxxxxx>]

On 01/18/2016 10:09 PM, Jim Fehlig wrote:
> On 01/14/2016 05:31 AM, Lars Kurth wrote:
>> Hi all,
>>
>> as we agreed yesterday, it would make sense to
>> review 
>> http://docs.openstack.org/liberty/config-reference/content/xen_libvirt.html 
>> in
>> light of any new information and changes. In particular
>>
>>   * Update baselines and information related to issues
>>
> 
> The existing info looks good and is still valid, although I'm not qualified to
> review the Ubuntu paragraph.
The existing info also looks valid to me.

> 
>>   * Update known issues section
These two bullet points could perhaps be added:

* On compute nodes running Kilo or later, live migration monitoring relies on
libvirt APIs that are only implemented since version 1.3.1. When attempting to
live migrate, the migration monitoring thread would crash and leave the instance
state as "MIGRATING". If you experience such an issue and you're running on
libvirt < 1.3.1 make sure you backport commits ad71665 and b7b4391 from 
upstream.

* Live migration is supported on libxl libvirt driver since 1.2.5 though it
doesn't work out of the box on openstack and requires modifications on nova to
use an alternative migration API. Note that, since 1.3.0 most of these issues
with respect to migration protocol compatibility have been addressed.
Furthermore, libvirt support for Peer to Peer mode is undergoing work on libxl
libvirt driver so that no modifications are required on nova.

>>
> 
> It would be cool if Xen+libvirt now worked with Neutron. I haven't followed
> development close enough to know.
Do you folks here know what are the issues with Neutron (if any) ?

> 
>>   * Add anything new we want to highlight (e.g. Libguestfs and libvirt qemu
>>     driver dependency, …)
>>
> 
> I don't know the details well enough to articulate a thorough description of 
> the
> issue, but as a start:
> 
> OpenStack compute nodes can use libguestfs to inject files in an instance's
> image prior to launching the instance. libguestfs uses libvirt's qemu driver 
> to
> start a qemu process, which is then used to inject files into the image. When
> using libguestfs for file injection, the compute node must have the libvirt 
> qemu
> driver installed, in addition to the Xen driver. In most distributions, the 
> qemu
> driver is provided by the libvirt-daemon-qemu package.
I believe this paragraph precisely describes the issue. I wouldn't include in
the "Known Issues" since it's not exactly a problem with most distros, but just
something to pay attention to. So perhaps right before the "Troubleshoot Xen
with Libvirt" section?

Regards,
Joao

> 
> Regards,
> Jim
> 

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