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

[Jim Fehlig <jfehlig@xxxxxxxx>]

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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