virt February 2010

virt@lists.centos.org

33 participants
27 discussions

Re: [CentOS-virt] moving from Xen to KVM
by Christopher G. Stach II 18 Mar '10

18 Mar '10

----- "Dave Augustus" <davea(a)ingraftedsoftware.com> wrote: > I finally realized that when running Xen and in Dom0, Xen hides the > AMD-V in /proc/cpuinfo Really? dom0: flags : fpu tsc msr pae mce cx8 apic mtrr mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext 3dnow constant_tsc pni monitor cx16 lahf_lm cmp_legacy svm cr8_legacy guest: flags : fpu tsc msr pae mce cx8 apic mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext 3dnow constant_tsc pni monitor cx16 lahf_lm cmp_legacy svm cr8_legacy > (...more reasons to move to KVM) I have a hunch that you are going to do whatever you are told to do and that you really have no idea what is going on. Can we get more "Hey, I'm told KVM is cool so I'm migrating all of my production servers to it because the free OS of my choice may not support it in a year or two after I leave my current suckjob position and I hear, since I don't read mainline kernel mailing lists religiously and keep only a superficial idea in my head about kernel development, since I really have no idea what 'kernel development' means, that KVM is the only Jesus-approved way of doing things" threads? None of you seem to have have a head for any of this, it seems. Maybe you're just working for Billy's Interwebs-r-Us and keeping Sally's Nail Shop going strong, but the last time I checked, the "ent" in CentOS stood for "enterprise". Here are a few tips: 1. Fuck KVM. 2. Stick with Xen because there is quite a lot of time until 5 is EOL'd and if you haven't noticed, it's actually a mature technology. 3. Figure out what you are going to do with Sally's Nail Shop in the meantime. If you have time to fuck everything up in your environment with KVM, you can probably save 20% or more optimizing your environment and even more with proper capital investments and training. 4. Figure out how either a) non-critical/enterprise services would ever be served by KVM's features or lack thereof, or b) you are going to CYA when you can't guarantee an SLA. 5. Spend more time on KVM dev lists instead of posting here and annoying others with your butthurt KVM-won't-work posts, as it's not even supported upstream. -- Christopher G. Stach II http://ldsys.net/~cgs/

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Fedora 12 2.6.31.5-127.fc12 domU on CentOS 5.4 2.6.18-164.6.1.el5xen fails to boot
by Charles J Gruener 06 Mar '10

06 Mar '10

Doing a kickstart install of Fedora 12 results in a non-bootable image. >From a virt-maanger instance, the error produced when trying to run the domU is: Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/engine.py", line 498, in run_domain vm.startup() File "/usr/share/virt-manager/virtManager/domain.py", line 573, in startup self.vm.create() File "/usr/lib64/python2.4/site-packages/libvirt.py", line 287, in create if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self) libvirtError: POST operation failed: xend_post: error from xen daemon: (xend.err "Error creating domain: Boot loader didn't return any data!") If you drop to the command line to see what pygrub gets back, you get: # pygrub /var/lib/xen/images/fedora12.img Traceback (most recent call last): File "/usr/bin/pygrub", line 677, in ? fs = fsimage.open(file, get_fs_offset(file)) IOError: [Errno 95] Operation not supported The kickstart worked perfectly in Fedora 11 on a CentOS 5.4 dom0. I've tried investigating all sorts of grub options and even tried copying kernel and initramfs files out from the domU to dom0 and booting from those with no luck. The only thing that does work is if I install Fedora 11 and then perform an upgrade to Fedora 12. I really don't want to have to deploy machines this way. Is anyone else experiencing this issue? I can provide any further information requested. Basically, to repeat my error, install CentOS 5.4 with Virtualization, then try to install a Fedora 12 domU. The installation finishes without error but you can't boot. The systems are all x86_64. Thanks. Charles

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Sound and VGA resolution for KVM guests
by carlopmart 26 Feb '10

26 Feb '10

Hi all, Recentlly, I have installed a Windows 7 Enterprise kvm guest under a CentOS 5.4 kvm host (fully updated) using virtio drivers and all works ok except two things: sound and vga resolution. a) How can I increase vga resolution to 1440x900 or is not possible to configure more than 1024x768 when virt-manager is used?? b) I have assigned a sound device to this windows guest (ac97) but it doesn't works. Do I need to download this driver from some location?? Under hardware view windows shows me a multimedia device but without driver installed. Thanks. -- CL Martinez carlopmart {at} gmail {d0t} com

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moving from Xen to KVM
by Dave Augustus 26 Feb '10

26 Feb '10

Hello All, I have been building a new server to deploy using Xen. However, seeing that Redhat is moving towards KVM, it would seem beneficial to deply this server using KVM as well. This is a Centos 5.4 x86_64 fresh install. So here is the scoop: * running the xen kernel with 2 vms works great. I have 2 vms- a cobbler host and an ldap host. * running with non-xen kernel, I can't seem to get anything to work right. Using virt-install from the command line, I get the response of "Host does not support any virtualization options" yet I know it does. What am I missing here? I spent some hours last night searching and came up empty. Thanks in advance, Dave

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guest management: 1 and only 1 instance
by Christopher Hunt 26 Feb '10

26 Feb '10

Gang, I run several KVM host machines. Due to updates, maintenance, and unexpected reboots sometime host machines are restarted. I can easily envision a scenario where HostX needs some critical packages updated or is acting up. I migrate guest0, guest1, guest2 etc. from HostX to HostY. Then, in either a planned (i.e. scheduled maintenance) or unplanned (i.e. unplanned reboot) event reboots HostX. Unfortunately guest0, guest1 and guest2 are all set to autostart on HostX but they're currently running on HostY when HostX boots.... etc etc etc Is anyone using effective packages, scripts or techniques which help maintain that all guest are running once and only once across a cluster of KVM hosts? I have been using virt-manager but it's not automated so much... Thanks for your feedback, Chris

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what's wrong with using the qemu monitor with kvm/libvirt?
by Mr. X 26 Feb '10

26 Feb '10

List, http://www.redhat.com/archives/libvirt-users/2010-January/msg00012.html As in the above post, I wondered why the Qemu Monitor is not available when using kvm with libvirt. With the amount of features that are already exposed in Qemu, it might be easier to run qemu-kvm commands manually/script and forget libvirt in order to not lose this ability. -- Mark

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Re: [CentOS-virt] Mounting LVM contained ntfs systems.
by Christopher G. Stach II 25 Feb '10

25 Feb '10

----- "Ben M." <centos(a)rivint.com> wrote: > I dd'd the LV from a snapshot to an empty LV on a different VG with > identical extents like this: > > dd if=/dev/vgsnapshotsource/win2k8-snapshot > of=/dev/vgtarget/win2k8-target > > I'm a little confused by what you mean by "partition" and disk in this > context. There is the LV container created, a partition, but also a > volume and presented as a "disk" to the Windows vm. I meant from the perspective of Linux. It is unclear to me how many layers are involved and whether or not you already did the kpartx bit, but if in case you didn't... If Windows is using the LV as an entire disk and partitions it, you have to use that partition table, too. -- Christopher G. Stach II http://ldsys.net/~cgs/

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OpenNode (CentOS based) virtualization solution preview released
by Andres Toomsalu 25 Feb '10

25 Feb '10

Hi, We have released first preview release of OpenNode - http://opennode.activesys.org - an open source server virtualization solution providing easy to use (CentOS based) bare-metal ISO installer and supporting both OpenVZ container-based virtualization and KVM full virtualization technology on the same physical host out-of-the-box. So everybody who wants to use OpenVZ and KVM together on CentOS host this should be appealing. OpenNode main features are: 1) easy to use automated disk partitioning and LVM setup (also creating softraid setup if desired - thou true hardware raid is reccomended for production servers) 2) installs minimum set of packages needed for out-of-the-box openvz and kvm hypervisors support - together with the libvirt (inluding virsh and virt-install CLI utilities) and func (Fedora Unified Network Controller) management interfaces 3) includes stable RHEL5 2.6.18 series kernel provided by OpenVZ project and rebuilded KVM kernel module package for this ovzkernel 4) does automatic bridge networking setup needed for OpenVZ veth (which enables broadcast traffic for container) and KVM networking - you just enter interface configuration data in the installer networking screen and bridge setup is taken care of by the installer 5) includes opennode cli utility which will run at console logon - provides (currently only openvz) templates download (CentOS, Ubuntu, LTSP, OpenVPN, Bind, etc.) and registering OpenNode with central management solution (in development) 6) disables unneeded services - just run only things that are needed by hardware node to provide stable virtualization platform OpenNode installer ISO download is provided through sourceforge.net project page - http://sourceforge.net/projects/opennode Please test the installer and also give us feedback for improving OpenNode. Best regards, -- ---------------------------------------------- Andres Toomsalu, andres(a)active.ee

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Moving vmware guests to a CentOS KVM server
by carlopmart 24 Feb '10

24 Feb '10

Hi all, I need to move ten CentOS/RHEL 5.4 vmware guests from a vmware ESXi 4 host to a CentOS 5.4 KVM host (fully patched). But I have two doubts. First: all these guests have two e1000 network drivers defined as a eth0,eth1 and modprobe.conf file is the same on all: alias eth0 e1000 alias eth1 e1000 alias net-pf-10 off options ipv6 disable=1 Can I change e1000 driver to virtio_net driver without problems and then update kernel??? Second doubt: all MAC address are defined with vmware range (00:50:56:XX:XX:XX) and I have configured all with HWADDR option under ifcfg-ethX files. Do I need to change all MAC address to KVM range or can I keep vmware range?? I don't need to convert virtual disks because all these guests are installed on an iSCSI luns under Solaris/ZFS servers ... Many thanks. -- CL Martinez carlopmart {at} gmail {d0t} com

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Boot delay and startup order for KVM guests
by carlopmart 23 Feb '10

23 Feb '10

Hi all, Finally, I have migrated my rhel/centos guests from vmware to kvm server using virtio drivers without problems. But I need to startup these guests using certain order and assign boot delays. How can I do this?? Does kvm provides some type of tool to do it?? Or do I need to create virsh scripts to do it?? I have tried autostart option from libvirt but starts all guests at the same time. Thanks. -- CL Martinez carlopmart {at} gmail {d0t} com

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virt February 2010