virt

virt@lists.centos.org

1608 discussions

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

5 7

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

2 1

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

1 0

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/

2 1

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

2 2

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

4 6

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

3 4

Dynamically add virtio storage to guests via libvirt and KVM?
by Steven Ellis 23 Feb '10

23 Feb '10

Is this actually possible with KVM on Centos 5.4? I'd like to be able to grow the storage of a virtualised database server as required. Both the base server and virtual guest are running Centos 5.4 I've tried adding the storage but it doesn't appear until reboot. I can't force a scsi device scan as there are no entries under /sys/class/scsi_* Any ideas? Steve

1 0

Fedora 12 domU will not boot kernel
by Tait Clarridge 22 Feb '10

22 Feb '10

Hello Everyone, I have been trying to get a Fedora 12 domU to boot for the better part of the afternoon and haven't had success booting any F12 kernel in Xen. I can get Fedora 11 installed no problem, tried to do a preupgrade but the when booting the preupgrade kernel through grub (or even from outside the domU) the domU reboots very quickly and ultimately crashes. As far as I saw in the qemu-dm-xxx.log, xend.log, and xend-debug.log there are no messages informing me of what went wrong. I am using CentOS 5.3 with the 2.6.18-92.1.22.el5xen kernel. I am unable to update the kernel at this time as new drivers cause major disk controller issues. If it as simple as a kernel update I will try again, but as of right now I am stumped so I asking for a little help! Has anyone successfully gotten F12 set as a domU using the regular CentOS xen and kernel-xen packages? xen-3.0.3-80.el5_3.3 kernel-xen-2.6.18-92.1.22.el5 Best, Tait

4 11

Mounting LVM contained ntfs systems.
by Ben M. 20 Feb '10

20 Feb '10

Using CentOS 5.4 Xen Virtualization "stock install" Added rpmforge NTFS extension for mount command. Scenario: Have mirror dd'd off to "backup" unmounted LV contained Windows machine. Within the LVM volume are two NTFS partitions formatted by Win2k8. Issue: How can I mount this? I need to verify file existence and run batch of file compare checks. If I try to mount the LV: ~~~~~~~~~~~~~ [root@vm1 ~]# mount -t ntfs /dev/thisvg00/thisw2kwe-b4change /mnt/ntfs NTFS signature is missing. Failed to mount '/dev/mapper/serv1vg00-w2kwe--b4cert': Invalid argument The device '/dev/mapper/serv1vg00-w2kwe--b4cert' doesn't seem to have a valid NTFS. Maybe the wrong device is used? Or the whole disk instead of a partition (e.g. /dev/sda, not /dev/sda1)? Or the other way around? ~~~~~~~~~~~~~ Would I have had an easier situation if I just had made one big C: partition instead of two (1 for OS and progs, other for data and applications)?

2 2

Jump to page:

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

virt