Working with xen images

Sometimes we need recover data stored into a xen image because the image is damaged.

How can do it?

1) Find the loop used by the xen  image (for example /dev/loop15)

2) Find the disk geometry using fdisk -lu

fdisk -lu /dev/loop15
Disk /dev/loop15: 3221 MB, 3221225472 bytes
255 heads, 63 sectors/track, 391 cylinders, total 6291456 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0x000222d3
Device Boot      Start         End      Blocks   Id  System
/dev/loop15p1              63      257039      128488+  83  Linux
/dev/loop15p2          257040      755054      249007+  82  Linux swap / Solaris
/dev/loop15p3          755055     6281414     2763180   83  Linux

3) Now, we need identify the root file system, for example /dev/loop153

4) Now, we need find the root FS start, 755055, for example

5) And, we need to make the following operation 512 x 755055 = 386588160

6) And, now, tha black vodoo…

mount -o loop,offset=386588160 /disco/xen/maquinas/maquina16  /tmp/foo

7) Ready, patition mount in /tmp/foo directory

Rescue your data and enjoy it.

One thought on “Working with xen images

Deja un comentario

Tu dirección de correo electrónico no será publicada. Los campos obligatorios están marcados con *