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33.2. Changing between the KVM and Xen hypervisors
This section covers changing between the KVM and Xen hypervisors.
Red Hat only supports one active hypervisor at a time.
Important
Presently, there is no application for switching Xen-based guests to KVM or KVM-based guests to Xen.
Warning
This procedure is only available for the Intel 64 or AMD64 version of Red Hat Enterprise Linux 5.4 or newer. No other configurations or Red Hat Enterprise Linux versions are supported. KVM is not available in versions earlier than Red Hat Enterprise Linux 5.4.
33.2.1. Xen to KVM
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The following procedure covers changing from the Xen hypervisor to the KVM hypervisor. This procedure assumes the kernel-xen package is installed and enabled.
Install the KVM package
Install the kvm package if you have not already done so.# yum install kvmVerify which kernel is in use
The kernel-xen package may be installed. Use theunamecommand to determine which kernel is running:$ uname -r 2.6.18-159.el5xenThe present kernel, "2.6.18-159.el5xen", is running on the system. If the default kernel, "2.6.18-159.el5", is running you can skip the substep.Changing the Xen kernel to the default kernel
Thegrub.conffile determines which kernel is booted. To change the default kernel edit the/boot/grub/grub.conffile as shown below.default=1 timeout=5 splashimage=(hd0,0)/grub/splash.xpm.gz hiddenmenu title Red Hat Enterprise Linux Server (2.6.18-159.el5) root (hd0,0) kernel /vmlinuz-2.6.18-159.el5 ro root=/dev/VolGroup00/LogVol00 rhgb quiet initrd /initrd-2.6.18-159.el5.img title Red Hat Enterprise Linux Server (2.6.18-159.el5xen) root (hd0,0) kernel /xen.gz-2.6.18-159.el5 module /vmlinuz-2.6.18-159.el5xen ro root=/dev/VolGroup00/LogVol00 rhgb quiet module /initrd-2.6.18-159.el5xen.imgNotice the default=1 parameter. This is instructing the GRUB boot loader to boot the second entry, the Xen kernel. Change the default to0(or the number for the default kernel):default=0 timeout=5 splashimage=(hd0,0)/grub/splash.xpm.gz hiddenmenu title Red Hat Enterprise Linux Server (2.6.18-159.el5) root (hd0,0) kernel /vmlinuz-2.6.18-159.el5 ro root=/dev/VolGroup00/LogVol00 rhgb quiet initrd /initrd-2.6.18-159.el5.img title Red Hat Enterprise Linux Server (2.6.18-159.el5xen) root (hd0,0) kernel /xen.gz-2.6.18-159.el5 module /vmlinuz-2.6.18-159.el5xen ro root=/dev/VolGroup00/LogVol00 rhgb quiet module /initrd-2.6.18-159.el5xen.img
Reboot to load the new kernel
Reboot the system. The computer will restart with the default kernel. The KVM module should be automatically loaded with the kernel. Verify KVM is running:$ lsmod | grep kvm kvm_intel 85992 1 kvm 222368 2 ksm,kvm_intelThekvmmodule and either thekvm_intelmodule or thekvm_amdmodule are present if everything worked.
33.2.2. KVM to Xen
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The following procedure covers changing from the KVM hypervisor to the Xen hypervisor. This procedure assumes the kvm package is installed and enabled.
Install the Xen packages
Install the kernel-xen and xen package if you have not already done so.# yum install kernel-xen xenThe kernel-xen package may be installed but disabled.Verify which kernel is in use
Use theunamecommand to determine which kernel is running.$ uname -r 2.6.18-159.el5The present kernel, "2.6.18-159.el5", is running on the system. This is the default kernel. If the kernel hasxenon the end (for example,2.6.18-159.el5xen) then the Xen kernel is running and you can skip the substep.Changing the default kernel to the Xen kernel
Thegrub.conffile determines which kernel is booted. To change the default kernel edit the/boot/grub/grub.conffile as shown below.default=0 timeout=5 splashimage=(hd0,0)/grub/splash.xpm.gz hiddenmenu title Red Hat Enterprise Linux Server (2.6.18-159.el5) root (hd0,0) kernel /vmlinuz-2.6.18-159.el5 ro root=/dev/VolGroup00/LogVol00 rhgb quiet initrd /initrd-2.6.18-159.el5.img title Red Hat Enterprise Linux Server (2.6.18-159.el5xen) root (hd0,0) kernel /xen.gz-2.6.18-159.el5 module /vmlinuz-2.6.18-159.el5xen ro root=/dev/VolGroup00/LogVol00 rhgb quiet module /initrd-2.6.18-159.el5xen.imgNotice the default=0 parameter. This is instructing the GRUB boot loader to boot the first entry, the default kernel. Change the default to1(or the number for the Xen kernel):default=1 timeout=5 splashimage=(hd0,0)/grub/splash.xpm.gz hiddenmenu title Red Hat Enterprise Linux Server (2.6.18-159.el5) root (hd0,0) kernel /vmlinuz-2.6.18-159.el5 ro root=/dev/VolGroup00/LogVol00 rhgb quiet initrd /initrd-2.6.18-159.el5.img title Red Hat Enterprise Linux Server (2.6.18-159.el5xen) root (hd0,0) kernel /xen.gz-2.6.18-159.el5 module /vmlinuz-2.6.18-159.el5xen ro root=/dev/VolGroup00/LogVol00 rhgb quiet module /initrd-2.6.18-159.el5xen.img
Reboot to load the new kernel
Reboot the system. The computer will restart with the Xen kernel. Verify with theunamecommand:$ uname -r 2.6.18-159.el5xenIf the output hasxenon the end the Xen kernel is running.
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