[CentOS-virt] (KVM) How can I migrate VM in a non shared storage environment?
Lucas Timm LH
linuxhelper at gmail.com
Thu Jun 24 13:12:56 EDT 2010
Create a new virtual machine on your storage. After this, boot some Linux
distribution in your new virtual machine (I like SysrescueCD). Enable your
ssh server, change the root password and so and back to your old virtual
server and type:
# dd if=/dev/sda | ssh root@(new_vm) "(dd of=/dev/sda)"
Type the root password, shutdown the old VM and reboot your new vm.
(PS: You don't need to shutdown the old vm to this proccess).
I do this everytime, I don't like copy the HD files using cp, tar or rsync
because it try to copy the /proc, /dev and a lot virtual devices. Using dd
it copies just the HD bits, the boot sector, etc.
2010/6/24 C.J. Adams-Collier <cjac at colliertech.org>
> I often use rsync -a for remote systems or cp -a for local systems.
> I've also used dd. You can have dd output to stdout, pipe it to ssh and
> have ssh output to dd on the other end.
> You can also connect to a SAN device on the source and dd from the local
> block device to the SAN device.
> Lots of ways to do it ;)
> On Thu, 2010-06-24 at 10:52 -0400, Kelvin Edmison wrote:
> > On 24/06/10 7:17 AM, "Poh Yong Hwang" <yongsan at gmail.com> wrote:
> > > I have a server running CentOS 5.5 with KVM capabilities. I need to
> > > all the VMs to another server with the exact same hardware specs. The
> > > is it is running on individual harddisks, not shared storage. What is
> the best
> > > way to migrate to minimise downtime?
> > I've had good success using dd and nc (netcat) to copy the contents of a
> > disk or disk image from one machine to another, and verifying the copy
> > successful with a md5sum or sha1sum of both the original and copied disk.
> > Kelvin
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Lucas Timm, Goiânia/GO.
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