virt July 2014

virt@lists.centos.org

22 participants
16 discussions

Centos 7 KVM questions
by Tom Bishop 21 Jul '14

21 Jul '14

Clean install of centos 7 and I have most things working, however the default virbr0 interface is not getting any addressing. The interface in network manager just spins and spins and never gets an address. I thought at first it was something about firewalld which I am trying to come up to speed with but I do not believe that is the issues. I guess the questions that I have is what is the correct way to add KVM and all of the virt packages to a minimal centos 7 installation. I would like to understand bridged interfaces vs the nat interfaces what what needs to be installed/configured. Thanks in advance.

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C7 image that can boot on x4c6
by Venkat Rayaprolu 19 Jul '14

19 Jul '14

Hi All, I am new to this community. I have experience in testing different virtualization products such as VMware, Xen and Oracle Virtual Server for more than 8 years. Can I contribute to testing C7 image that can boot on x4c6? Please help me on whom to contact for this? Thanks, Venkat

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Fwd: About Centos 7 + Virt-manager
by Pablo Silva 17 Jul '14

17 Jul '14

Dear Colleagues: I'm trying to use virt-manager to create a container with lxc, as the picture I attached, I indicated that I must point to a directory where the template is to manage it with virt-manager. I tried to use a template of http://wiki.openvz.org/Download/template/precreated, but not working, being on the console option displays a black screen with nothing. I wonder, where can I get a template to work with virt-manager, or what are the steps to follow so you can create a template with Centos Minimal, do not know if the template must be the same version of Centos 7 or can be a template with Centos 6.5 In advance, thank you very much. -Pablo http://picpaste.com/Captura_de_pantalla_2014-07-15_a_las_10.47.26-DHi28gtt.… http://picpaste.com/Captura_de_pantalla_2014-07-15_a_las_10.49.02-y4TkGxLY.…

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Re: [CentOS-virt] Xen PV domU reported as Xen-HVM
by Karl Johnson 07 Jul '14

07 Jul '14

On Tue, Jun 17, 2014 at 5:36 AM, George Dunlap <dunlapg(a)umich.edu> wrote: > On Thu, Jun 12, 2014 at 11:23 PM, Karl Johnson <karljohnson.it(a)gmail.com> > wrote: > > Hello, > > > > I am running two dom0s, one on CentOS 5 with Xen 4.1.2 (from Gitco) and > the > > other one on CentOS 6 with Xen 4.2.4 (from Xen4CentOS). I host one LVM > based > > domU on both from the same template (CentOS 6 PV) with the same Xen > config > > (see below). However, the domU on Xen 4.1 reports itself as Xen PV while > the > > domU on Xen4CentOS reports itself as Xen HVM. > > > > > > == First domU == > > > > virt-what and cPanel scripts report domU as: xenpv > > > > dom0: 2.6.18-371.6.1.el5xen Xen 4.1.2 > > > > domU Config: > > > > bootloader = '/usr/bin/pygrub' > > extra = '' > > memory = 6144 > > hostname = 'web2.x.ca' > > cpu_weight = 256 > > name = 'vm115' > > vif = ['ip=205.X.X.X, vifname=vifvm115.0, mac=00:16:3e:7a:X:X'] > > vnc = 0 > > vcpus = 6 > > vncviewer = 0 > > serial = 'pty' > > disk = ['phy:/dev/xen/vm115_img,xvda1,w', > > 'phy:/dev/xen/vm115_swap,xvda2,w'] > > > > domU kernel: 2.6.32-431.5.1.el6.x86_64 > > > > root@web2 [~]# virt-what > > xen > > root@web2 [~]# > > > > > > > > == Second domU == > > > > virt-what and cPanel scripts report domU as: xenhvm > > > > dom0: 3.10.32-11.el6.centos.alt.x86_64 Xen 4.2.4-29.el6 > > > > domU Config: > > > > bootloader = '/usr/bin/pygrub' > > extra = '' > > memory = 6144 > > hostname = 'web3.x.ca' > > cpu_weight = 256 > > name = 'vm116' > > vif = ['ip=205.X.X.X, vifname=vifvm116.0, mac=00:16:3e:cf:X:X'] > > vnc = 0 > > vcpus = 6 > > vncviewer = 0 > > serial = 'pty' > > disk = ['phy:/dev/xen/vm116_img,xvda1,w', > > 'phy:/dev/xen/vm116_swap,xvda2,w'] > > > > domU kernel: 2.6.32-431.5.1.el6.x86_64 > > > > root@web3 [~]# virt-what > > xen > > xen-hvm > > root@web3 [~]# > > > > Any idea why? > > A lot of these tools use quirks of the hypervisor to detect these > kinds of changes. One such quirk in Xen PV is handling of the CPUID > instruction: normally there's no way to trap the CPUID instruction in > PV mode, so Xen introduced a special PV CPUID (which is just an > illegal instruction that Xen recognizes and emulates itself) that the > kernel is supposed to use instead; but that's an opt-in thing -- you > can still execute the normal CPUID. By executing the PV CPUID and the > normal CPUID and comparing the results, you can tell if you're in a PV > or an HVM VM. > > However, on recent architectures Intel has introduced functionality to > allow trapping os CPUID even in non-HVM mode. Support for this went > into 4.2. Now, if you have the right hardware, and the right Xen > version, you'll get the same results whether you execute the PV CPUID > or the native one. > > So virt-what's trick of comparing the two CPUID results to determine > if you're in a PV or an HVM domain doesn't work anymore. > > -George > Thanks for the reply George. Is there any other easy way in the domU to know if it's a pv or hvm with Xen 4.2+ and the right hardware? Karl

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I have a question regarding the virtual scsi adapter.
by Eliezer Croitoru 03 Jul '14

03 Jul '14

I have a very old system which has a self compiled kernel. It' supports sata and megaraid but not LSI SCSI or BUSLOGIC scsi. I am not sure what SCSI adapter is being used on CentOS KVM host and there for what kernel options to enable in the new compiled kernel. I have tried to add LSI logic and it seems like still not recognizing the SCSI device. I have another kernel that do work but it was build with lots of modules and I am not sure which one of them is the appropriate one. The linux kernel version of the guest is 2.6.19. If someone has a .config file that has all the needed modules complied in the kernel I will be happy to see it. Thanks, Eliezer

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Minutes of 1 July Virt SIG meeting (IRC)
by George Dunlap 01 Jul '14

01 Jul '14

Not too many people today. Present: - George - Pasi - Johnny H Covered - Update to 4.4.1 sooner, don't wait for the community build system to be up ACTION: George to rebase to 4.4.1-rc1, Johnny to build an RC for testing - virt-manager for C6 erroneously installs C7 as PV, even though it installs RH7 as HVM ACTION: hughesjr to send a bug report (or find someone to do so) - pv-grub-menu ACTION: pasi maybe to take a look in the next few weeks. ACTION: George to add to roadmap

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virt July 2014