James, I'd be interested in knowing some of how you handled the ESX to KVM migration, and some caveats you might have found along the way.
This is from our internal wiki from notes I wrote at the time - will be pretty busy here between now and christmas but happy to answer any specific issues... this should be fine for an initial start at conversion points.... Note that was last edited 11/8/2010 so v2v tools might be quicker from the non-existence they had back then ;)
James
Copy the disk image from vmware to kvm host
Stop the guest in VMware so that no data is being written to the disk image and the file is not locked by any processes. Rsync on the virtualserver from the ESX serevr to the local drive rsync -h --progress root@ostesx0[1-7]:'/vmfs/volumes/ost*/<guestname>/*-flat.vmdk' /var/lib/libvirt/images/ On the KVM host after the disk is copied over convert it to a RAW image. <something>.img should match the name of the disk that was defined in the XML previously. cd /var/lib/libvirt/images qemu-img convert <something>-flat.vmdk -O raw <something>.img Changes required in the guest
Boot with Centos Live CD - the template defined previously includes the Centos LiveCD and booting from the CD so just start the VM guest. Mount the disk in the live session As the root user: mkdir -p /media/guestdisk mount /dev/vda1 /media/guestdisk Chroot into the mounted disk mount -o bind /dev /media/guestdisk/dev mount -o bind /sys /media/guestdisk/sys mount -o bind /proc /media/guestdisk/proc chroot /media/guestdisk /bin/bash Rebuild initrd with the virtio modules mkinitrd -f --with=virtio_blk --with=virtio_pci /boot/initrd-<mostrecentkernel>.img <mostrecentkernel> You can get the most recent kernel version by:
ls -ltr /boot/vmlinuz* | tail -n 1 The output will look like:
-rw-r--r-- 1 root root 1954652 May 13 18:38 /boot/vmlinuz-2.6.18-194.3.1.el5 Where in the case given the kernel version would then be 2.6.18-194.3.1.el5
Remove VMwareTools rpm -e VMwareTools Check it is removed by:
rpm -qa | grep -i vmware Then remove the vmware auto configure trickery in /etc/rc.local
vi /etc/rc.local
remove this block of text:
rkernel=2.6.18-164.el5 if [ -e /etc/vmware-tools/not_configured ]; then echo vmware-tools not configured for running kernel echo running vmware-config-tools.pl /usr/bin/vmware-config-tools.pl -d echo vmware-tools now compiled for running kernel echo restarting system reboot fi Check for any /etc/fstab changes needed Change /boot/grub/devices.map vi /boot/grub/devices.map
change /dev/sda to /dev/vda Exit the chroot (exit or ctrl+D) Ensure grub installed correctly on disk image /media/guestdisk/sbin/grub-install --root-directory=/media/guestdisk /dev/vda Unmount the disk and poweroff umount /media/guestdisk/proc umount /media/guestdisk/dev umount /media/guestdisk/sys poweroff