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

[Lars Kurth <lars.kurth@xxxxxxxxxx>]

I created https://bugs.launchpad.net/openstack-manuals/+bug/1548403 in
preparation for the changes as I need a bug.
Could those who are interested in tracking this one add themselves to the
bug? There are just too many people in the system (lots of Joao's, etc.)
Lars

On 18/02/2016 11:55, "Joao Martins" <joao.m.martins@xxxxxxxxxx> wrote:

>On 01/21/2016 06:31 PM, Joao Martins wrote:
>> 
>> 
>> 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.
>> 
>With respect to the last meeting minutes
>(http://lists.xenproject.org/archives/html/wg-openstack/2016-02/msg00003.h
>tml)
>this last paragraph requires changes:
>
>* Live migration is supported on libxl libvirt driver since 1.2.5 though
>it is
>only fully supported on openstack since 1.3.2, that is without modifying
>the
>migration APIs being used by the libvirt client (nova). It is worth
>mentioning
>that 1.3.0 addresses most of these issues with respect to libvirt
>migration
>protocol compatibility; and 1.3.2 gets support for peer to peer migration
>mode
>which nova relies on.
>
>>>>
>>>
>>> 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, â)
>>>>
>>>
>>> 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
>>>
>> 
>> _______________________________________________
>> Wg-openstack mailing list
>> Wg-openstack@xxxxxxxxxxxxxxxxxxxx
>> http://lists.xenproject.org/cgi-bin/mailman/listinfo/wg-openstack
>> 

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