Re: [Wg-openstack] Xen+Libvirt OpenStack monthly June meeting

[Lars Kurth <lars.kurth@xxxxxxxxxx>]

On 01/07/2015 09:50, "Bob Ball" <bob.ball@xxxxxxxxxx> wrote:

>I wonder if Xen's description on page 229 should have a link to page 236?

Good idea. I can do that, in the same way that I did it the other way
round.

>Did you add the reference to Kronos?  I believe this should be removed as
>Kronos is firstly a project name, but more importantly it's deprecated.
>Equally the name "xenserver-core" shouldn't be used.  Instead perhaps a
>comment in "XenAPI" section that a set of packages to use XenAPI on
>existing distributions can be built using the xapi-project/buildroot
>github project.

No, I did minimal changes to the XenServer docs. The main changes I made
were on the Hypervisor page. The XenServer docs really need to be revised,
but I don't want to do this as part of the Xen+Libvirt changes. And
probably someone from the XenServer team should do this.

I have renamed a lot of the files (xml and generated html) as the
XenServer doc file naming was very inconsistent.

>Page 230, "Privileged and unprivileged domains" - one minor clarification
>is probably needed at the bottom of the page as only XenAPI needs the
>Compute service in a domU.

Again. This was already there and it would probably make sense to fix this
separately. Maybe there needs to be a separate bug to fix up XenServer
docs.

>It's not clear from the PDF which of the changes were yours and which
>were existing items that were already wrong.  I'm happy to update these
>docs if it's beyond the scope of your change.

That would be a good idea, but you may want to wait until I committed the
changes. Otherwise you will have a merging nightmare.

>
>I don't have any additional comments beyond Jims below.
>
>Thanks,
>
>Bob
>
>> -----Original Message-----
>> From: Jim Fehlig [mailto:jfehlig@xxxxxxxx]
>> Sent: 30 June 2015 19:10
>> To: Lars Kurth; Konrad Wilk; Antony Messerli; Bob Ball; Stefano
>>Stabellini;
>> Anthony Perard; michael.glasgow@xxxxxxxxxx
>> Cc: wg-openstack@xxxxxxxxxxxxxxxxxxxx; wg-test-
>> framework@xxxxxxxxxxxxxxxxxxxx; Russell Pavlicek
>> Subject: Re: Xen+Libvirt OpenStack monthly June meeting
>> 
>> On 06/30/2015 11:06 AM, Lars Kurth wrote:
>> > Hi all,
>> >
>> > please find attached attached a PDF of the changes that I made to the
>> official
>> > OpenStack Config Reference. The relevant
>> >
>> >   * Hypervisor section is at page 223
>> >   * the modified XenServer docs are at page 229 â the main changes
>>here
>> are
>> >     about clarifying the difference between Xen and XenServer (mainly
>> terminology)
>> >   * and the new Xen + Libvirt docs are at page 236
>> >
>> 
>> For items 1 and 2 in "Additional Configuration Items", it should be
>>clarified
>> that dom0_mem and dom0_max_vcpus are Xen parameters, not dom0
>> kernel parameters.
>> Also, it should be noted that these are suggestions and that proper
>>values
>> should be based on the compute host resources. The suggested values
>> might not be
>> sufficient on a large memory/cpu host that will run many hundreds of
>> instances.
>> 
>> For item 3 in "Additional Configuration Items", hypervisor_type might
>>also
>> need
>> to be set in the image metadata, especially if the cloud contains mixed
>> hypervisor compute nodes. And IIRC, image metadata such as vm_mode,
>> hypervisor_type, architecture, etc. can be set when importing the image
>>to
>> glance. The metatdata can also be changed through the glance service,
>>e.g.
>> 
>> glance image-update <img-uuid> --property hypervisor_type=xen --
>> property vm_mode=hvm
>> 
>> The KVM section includes "Troubleshoot KVM". I think that would be
>>useful
>> in the
>> Xen + libvirt section too. At a minimum, it could mention the important
>>log
>> files to consult when e.g. an instance fails to start:
>> /var/log/libvirt/libxl/libxl-driver.log,
>> /var/log/xen/qemu-dm-<instancename>.log, /var/log/xen/xen-hotplug.log,
>> etc.
>> 
>> > > Lars asked whether anyone is willing to help with reviews of the
>> documentation
>> >
>> > > Bob will review
>> >
>> > > Michael Glasgow: happy to have a look also, but is not yet that
>>familiar
>> > with OpenStack
>> >
>> > > Jim: Happy to look at libvirt portion of the documentation
>> >
>> >
>> > If those, who volunteered could have a look at the docs and let me
>>know
>> > whether they look fine, I will get them reviewed on Gerrit. I am in
>> particular
>> > looking for omissions and correctness.
>> > It would also be good if we had a section on the Xen Wiki explaining
>>how
>> to
>> > rebuild Xen and Libvirt into Ubuntu packages, that I could link to.
>>At least
>> > until Xen 4.5.1 and later 4.4.3 are available in distros.
>> > You should also note that the CentOS Virt SIG is looking at back
>>porting the
>> > missing Xen changes into the imminent release of Xen 4.4.2 for CentOS
>>7
>> (which
>> > will contain Libvirt 1.2.15). But I can't promise as yet.
>> 
>> The latest releases of Xen and libvirt for the various openSUSE and SLES
>> distributions can always be found in the open build service
>>Virtualization
>> project
>> 
>> https://build.opensuse.org/project/show/Virtualization
>> 
>> Regards,
>> Jim
>

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