Xen users - Apr 2010 - xen DomU guest backup and restore

Hi all,

I want to perform a schedule backup of my DomU guest VM. In case of the
physical hardware failure, I want to restore the guest VM into another
server with same config and DOM0 OS version.

My Dom0 OS is centOS 5.4 with Xen 3.4.2
I create my guest VM as par-virtualized and using LVM for storage like
/dev/VolGroup00/vm1 for VM1
/dev/VolGroup00/vm2 for VM2
>From Guest, I create 3 partition under /dev/VolGroup00/vm1 like
/dev/sda1 /boot
/dev/sda2 /
/dev/sda3 swap

I use snapshot LVM to mount the partition /dev/VolGroup00/vm1 through kpartx
with two tar files : boot.tar and root.tar

I copied these two files to another server and extract the tar file under
the same OS and LVM size and use xen create to start the new guest OS.
However, it can not boot up at the error prompt that it can''t mount the
root
filssystem

Mounting root filesystem.
mount: could not find filesystem ''/dev/root''
Setting up other filesystems.
Setting up new root fs
setuproot: moving /dev failed: No such file or directory
no fstab.sys, mounting internal defaults
setuproot: error mounting /proc: No such file or directory
setuproot: error mounting /sys: No such file or directory
Switching to new root and running init.
unmounting old /dev
unmounting old /proc
unmounting old /sys
switchroot: mount failed: No such file or directory
Kernel panic - not syncing: Attempted to kill init!
Any idea?

What is the best practice for doing this schedule backup?


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From: "KC LO" <kclo2000@gmail.com> 
To: xen-users@lists.xensource.com 
Sent: Wednesday, April 28, 2010 1:40:38 PM 
Subject: [Xen-users] xen DomU guest backup and restore 


Hi all, 

I want to perform a schedule backup of my DomU guest VM. In case of the physical
hardware failure, I want to restore the guest VM into another server with same
config and DOM0 OS version.

My Dom0 OS is centOS 5.4 with Xen 3.4.2 
I create my guest VM as par-virtualized and using LVM for storage like 
/dev/VolGroup00/vm1 for VM1 
/dev/VolGroup00/vm2 for VM2 
>From Guest, I create 3 partition under /dev/VolGroup00/vm1 like 
/dev/sda1 /boot 
/dev/sda2 / 
/dev/sda3 swap 

I use snapshot LVM to mount the partition /dev/VolGroup00/vm1 through kpartx
with two tar files : boot.tar and root.tar

I copied these two files to another server and extract the tar file under the
same OS and LVM size and use xen create to start the new guest OS. However, it
can not boot up at the error prompt that it can''t mount the root
filssystem

Mounting root filesystem. 
mount: could not find filesystem ''/dev/root'' 
Setting up other filesystems. 
Setting up new root fs 
setuproot: moving /dev failed: No such file or directory 
no fstab.sys, mounting internal defaults 
setuproot: error mounting /proc: No such file or directory 
setuproot: error mounting /sys: No such file or directory 
Switching to new root and running init. 
unmounting old /dev 
unmounting old /proc 
unmounting old /sys 
switchroot: mount failed: No such file or directory 
Kernel panic - not syncing: Attempted to kill init! 

Any idea? 

What is the best practice for doing this schedule backup? 
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Try to check that the xen config files , in the "disk" section are the
same.


In particular, both copies shoudl have the save kind of device (xvd / sd). Also
check the xend.log


Hope it helps, 
Rubén

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".. should have the same .." 


sorry for the typo 

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