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Sysadmin/Migrate virtual machine (view source)
Revision as of 02:06, 23 January 2011
, 02:06, 23 January 2011no edit summary
* First, create the logical volume and attach it to the running VM:
* First, create the logical volume and attach it to the running VM:
treehouse# scp lightwave:/boot/{vmlinuz,initrd}-2.6.31-22-server /srv/vm/kernel/ubuntu/
treehouse# scp VMNAME:/boot/{vmlinuz,initrd}-2.6.31-22-server /srv/vm/kernel/ubuntu/
treehouse# virsh vol-create-as treehouse lightwave-root 10G
treehouse# virsh vol-create-as treehouse VMNAME-root 10G
treehouse# virsh attach-disk lightwave /dev/treehouse/lightwave-root vdc
treehouse# virsh attach-disk VMNAME /dev/treehouse/VMNAME-root vdc
treehouse# virsh console lightwave
treehouse# virsh console VMNAME
* From within the VM, format the new volume and move things over
* From within the VM, format the new volume and move things over
VMNAME# mkfs.ext4 -L VMNAME-root -O flex_bg,extent,uninit_bg,sparse_super /dev/vdc
VMNAME# tune2fs -c -1 -i 0 /dev/vdc
VMNAME# mount /dev/vdc /mnt
VMNAME# rsync -PHAXphax --numeric-ids --delete / /mnt/
VMNAME# vim /mnt/etc/fstab
VMNAME# umount /mnt
VMNAME# ^D
* Then edit the VM configuration to make it boot without GRUB, using externally provided kernel and initrd:
* Then edit the VM configuration to make it boot without GRUB, using externally provided kernel and initrd:
treehouse# virsh edit lightwave
treehouse# virsh edit VMNAME
<os>
<os>
<kernel>/srv/vm/kernel/ubuntu/vmlinuz-2.6.31-22-server</kernel>
<kernel>/srv/vm/kernel/ubuntu/vmlinuz-2.6.31-22-server</kernel>
<initrd>/srv/vm/kernel/ubuntu/initrd.img-2.6.31-22-server</initrd>
<initrd>/srv/vm/kernel/ubuntu/initrd.img-2.6.31-22-server</initrd>
<cmdline>console=tty0 console=ttyS0,115200n8 vga=normal root=LABEL=lightwave-root ro</cmdline>
<cmdline>console=tty0 console=ttyS0,115200n8 vga=normal root=LABEL=VMNAME-root ro</cmdline>
<boot dev='hd'/>
<boot dev='hd'/>
</os>
</os>
...
...
<disk type='block' device='disk'>
<disk type='block' device='disk'>
<source dev='/dev/treehouse/lightwave-root'/>
<source dev='/dev/treehouse/VMNAME-root'/>
<target dev='vda' bus='virtio'/>
<target dev='vda' bus='virtio'/>
</disk>
</disk>
* Reboot
* Reboot
#treehouse virsh destroy lightwave
#treehouse virsh destroy VMNAME
#treehouse virsh start lightwave --console
#treehouse virsh start VMNAME --console
=== How to migrate a file-based guest to LVM (offline method) ===
=== How to migrate a file-based guest to LVM (offline method) ===