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

[Bob Ball <bob.ball@xxxxxxxxxx>]

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

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.

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.

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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