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1610 discussions

Mixed dom0/domU usage?
by Dennis J. 04 Feb '09

04 Feb '09

Hi, I'm wondering about the impact of using both dom0 and domU's on a server at the same time. I'm worried about the performance impact of running a Mysql server in a domU and now I'm thinking about moving the Mysql part of a LAMP setup into dom0 and running a few Apache guests as domUs. Since the Apaches will serve mostly from an NFS share they won't have much impact on the disk i/o so the database should be able to utilize the local storage without much interference from the guests. The plan is to limit dom0 to let's say 4gb of ram and then use the rest of it for the VMs. Has anyone experinece with this kind of "mixed" setup (physical/virtual). Are there any known problems with this approach? Regards, Dennis

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Using the parallel port from domU
by Manuel Wolfshant 04 Feb '09

04 Feb '09

Hello I use xen and I am trying to use the parallel port of Centos 5.2 host from a Windows XP (HVM) guest. I have tried to transfer control of the port by blacklisting lp, parport and parport_pc + adding: ioports = [ "0378-037a" ] to the xen configuration file. However, in the presence of this line, xm create replies with: Error: function takes exactly 4 arguments (3 given) In xend.log I see: [2009-02-02 15:36:34 xend.XendDomainInfo 6246] DEBUG (XendDomainInfo:1603) XendDomainInfo.destroy: domid=13 [2009-02-02 15:36:34 xend 6246] ERROR (xmlrpclib2:184) function takes exactly 4 arguments (3 given) Traceback (most recent call last): File "/usr/lib64/python2.4/site-packages/xen/util/xmlrpclib2.py", line 162, in _marshaled_dispatch response = self._dispatch(method, params) File "/usr/lib64/python2.4/SimpleXMLRPCServer.py", line 406, in _dispatch return func(*params) File "/usr/lib64/python2.4/site-packages/xen/xend/server/XMLRPCServer.py", line 64, in domain_create info = XendDomain.instance().domain_create(config) File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomain.py", line 238, in domain_create dominfo = XendDomainInfo.create(config) File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py", line 205, in create vm.initDomain() File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py", line 1507, in initDomain self.createDevices() File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py", line 1716, in createDevices self.createDevice(n, c) File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py", line 1189, in createDevice return self.getDeviceController(deviceClass).createDevice(devconfig) File "/usr/lib64/python2.4/site-packages/xen/xend/server/DevController.py", line 80, in createDevice (devid, back, front) = self.getDeviceDetails(config) File "/usr/lib64/python2.4/site-packages/xen/xend/server/iopif.py", line 78, in getDeviceDetails allow_access = True) TypeError: function takes exactly 4 arguments (3 given) Except of a bug from 2007 and which should be fixed for a long time (and which is only PARTIALLY included in xen as available in 5.2), I have not found anything. I did apply the unapplied part of http://bugs.centos.org/file_download.php?file_id=474&type=bug but there is no change. Any ideas ? TIA manuel

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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

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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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