virt January 2009

virt@lists.centos.org

26 participants
22 discussions

kmod-kvm-2.6.18-92.1.18.el5-72-1.x86_64.rpm outdated, need on for 2.6.18-92.1.22.el5
by Michael Schenck 28 May '09

28 May '09

CentOS Virt, I'm looking for an RPM for the kmod-kvm processor specific modules (kvm-intel or kvm-amd). I've been using L. Farkas's repository, but after the recent kernel updates, I'm out of luck. Best Regards, Michael Schenck

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patched kernel addressing timekeeping issues under vmware
by Akemi Yagi 06 Feb '09

06 Feb '09

People at vmware have provided patches for RHEL 5 that aim to fix timekeeping issues in vmware guests. https://bugzilla.redhat.com/show_bug.cgi?id=463573 Description of problem (excerpt) : "In a virtual environment, timekeeping for RHEL 64 bit kernels can be problematic, since time is kept by counting timer interrupts for this kernel. The problem arises when the VM is descheduled for some portion of time. When the VM is rescheduled, the hypervisor needs to "catch up" delivering timer interrupts so that the kernel can determine the correct time. Until the VM is caught up, the kernel's time will be behind, causing short term divergence of the kernel's time with wallclock time. Additionally, under certain overcommitment conditions, it may not be possible for the hypervisor to fully catch up. In this case, the kernel time can fall behind over the long term. The solution is to change the kernel's timekeeping algorithm to keep time based on how much time has elapsed according to a time counter rather than by counting interrupts. This is similar to the timeofday algorithm used by clocksource enabled mainline kernels or the RHEL5 32bit kernel." They were hoping to get them into the RHEL 5.3 kernel but unfortunately this is not going to happen. It looks like the patches will be in the RHEL 5.4 kernel. Using the patches provided in the bugzilla, I have rebuilt the latest test kernel (-125) that is available from http://people.redhat.com/dzickus. You can download the patched kernel from: http://centos.toracat.org/kernel/centos5/vmware463573/ I have test-installed it on a couple of CentOS-5 x86_64 guests. Still too early to say anything about the clock issue, but so far so good. If you get a chance to give it a try, please share what you find. Thanks, Akemi (nick: toracat)

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RESOLVED : CentOS 5.2 (x86_64) : 64 bit HVM VM fails.
by jd 30 Jan '09

30 Jan '09

ok.. found the problem. The config file had pae=0. Changed it to pae=1 and now it is working. /Jd --- On Thu, 1/29/09, jd <jdsw2002(a)yahoo.com> wrote: > From: jd <jdsw2002(a)yahoo.com> > Subject: CentOS 5.2 (x86_64) : 64 bit HVM VM fails. > To: centos-virt(a)centos.org > Date: Thursday, January 29, 2009, 3:48 PM > hi > I am trying to do an installation of 64 bit HVM from a > CDROM, the Dom0 is 64 bit. I am getting "pae not > supported" !! > > (as a side note, failure on RHEL 5.2 is different > 'long not supported on your cpu, use a 32-bit > version' .. cpu is 64 bit AMD and so is Dom0) > > Do I need to tweak anything ? > > Thanks > /Jd

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CentOS 5.2 (x86_64) : 64 bit HVM VM fails.
by jd 29 Jan '09

29 Jan '09

hi I am trying to do an installation of 64 bit HVM from a CDROM, the Dom0 is 64 bit. I am getting "pae not supported" !! (as a side note, failure on RHEL 5.2 is different 'long not supported on your cpu, use a 32-bit version' .. cpu is 64 bit AMD and so is Dom0) Do I need to tweak anything ? Thanks /Jd

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xen clustermanagement?
by Heiko 27 Jan '09

27 Jan '09

Hello, im looking thorugh this list: http://www.gridvm.org/xen-remote-management-interfaces.html and wondering which would be the bst solution for our XEN machines. We have 20 Machines that serve each 3-8 Xen VMs. Right now we are doing everything by hand on the bash. I am setting up a new hardware machine and I would like to start with a managemet GUI for XEN. beside that I have another questions My client in the office is a debian based machine and I installed convirt, do I need a server on the centos server to communicate with convirt? greetings .r

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Re: [CentOS-virt] dummy ethernet interfaces
by Christopher G. Stach II 23 Jan '09

23 Jan '09

----- "Caitlyn O'Hanna" <ravenoak(a)virtualxistenz.com> wrote: > Actually, I don't know how to tell it its speed, or for that matter I > seem to not be able to find out what it thinks its speed is. What is bothering you about it? Is it showing up in an NMS via SNMP and miscalculating thresholds, or is it just cosmetic and a non-issue? > For completeness, and I'd also like to bump it up to 1000Mb/s or > higher > if I can, how would I go about finding out it's speed and changing > it? You don't. It's not a real interface. -- Christopher G. Stach II

1 0

dummy ethernet interfaces
by Caitlyn O'Hanna 23 Jan '09

23 Jan '09

I have a 32bit(PAE) CentOS5 machine running (stock CentOS) Xen. I've been using the kernel dummy ethernet driver to create interfaces on the host machine so that I can create internal networks for the guests and host to communicate with each other. The only issue I have with this is that the interface is not >=100MB, but is 10MB. Is there a way I can increase the speed of these interfaces (I've tried looking at the kernel docs and google'ing) or another dummy style interface driver I can use to create these? Thanks! --Caitlyn

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Warning on VirtualBox 2.1.0 on CentOS 5.2: Kernel Panic
by Todd and Margo Chester 23 Jan '09

23 Jan '09

Hi All, I just removed Virtual Box 2.1.0 from my system. When you boot up an XP guest, you will get a kernel panic. See http://www.virtualbox.org/ticket/2827 for details. I hope I saved someone else from the hassle I just had to go through. -T Now for FSCK on my hard drive!

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Re: [CentOS-virt] [GLPI #0000037] Zweirad Stadler | Neues Ticket - powernow error in Xen VM with new kernel
by Kai Schaetzl 23 Jan '09

23 Jan '09

Anyone else getting these "tickets" from sysadmin(a)zweirad-stadler.de quoting old messages to this list directly to his mailbox? Kai -- Kai Schätzl, Berlin, Germany Get your web at Conactive Internet Services: http://www.conactive.com

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Re: [CentOS-virt] Best virtualization setup for Centos 5.2
by Scott Dowdle 22 Jan '09

22 Jan '09

Sergej, ----- "Sergej Kandyla" <sk.paix(a)gmail.com> wrote: > I also looking for light weight virtualization solutions. > OpenVZ seems very good, but only reason that stopped me is that openvz > kernel is not officially supported by CentOS\RHEL. > > What could you say about stability of OpenVZ ? > > Afaik, OpenVZ kernel is based on RHEL/CentOS kernel, but what the > difference between them? > Is any RHEL stability patches also included in OpenVZ kernel ? The OpenVZ Project currently has three stable kernel branches: 1) RHEL4 2.6.9 based, 2) RHEL5 2.6.18 based, and 3) vanilla 2.6.18. They have a number of development branches that may or may not make it to stable including 2.6.24 (used by Ubuntu), 2.6.26 (in the upcoming Debian 5.0), and 2.6.27. Whenever Red Hat releases a kernel update they try to upgrade OpenVZ but the porting effort and the QA testing efforts can take some time... and sometimes Red Hat will come out with another kernel update before OpenVZ has released the last one. As a result, OpenVZ can at times lag behind the Red Hat kernel some. Of course they try to give more weight to serious security problems and released a update to the vslice issue (a very serious security issue in a range of mainline kernels a while ago) about the same time the CentOS project did... if I remember correctly. So far as stability goes, I haven't had any issues with their kernels so I have found them to be very stable. TYL, -- Scott Dowdle 704 Church Street Belgrade, MT 59714 (406)388-0827 [home] (406)994-3931 [work]

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virt January 2009