How to mount a xen image ?

benxiong

1. First you need to find out the partitions and the startsector of partitions:[root@xen rruban]# file rheltest.img
rheltest.img: x86 boot sector, GRand Unified Bootloader (0.94);
partition 1: ID=0x83, active, starthead 1, startsector 63, 208782 sectors;
partition 2: ID=0x8e, starthead 0, startsector 208845, 3871665 sectors, code offset 0x48
There are 3 partitions inside the image file. The startsector of
each partition is also listed. Boot partition will have start sector 63.
2. Now you need to get the sector size:[root@xen]fdisk -lu rheltest.img
Disk rheltest.img: 0 MB, 0 bytes 255 heads, 63 sectors/track, 0 cylinders, total 0 sectors
Units = sectors of 1 * 512 = 512 bytes        
Device Boot             Start         End      Blocks   Id  System
rheltest.img1   *          63      208844      104391   83  Linux
rheltest.img2          208845     4080509     1935832+  8e  Linux LVM
The above shows the sector byte size is 512 byte.
3. To calculating the offset: offset = start_sector x sector_byte_size.
The startsector is 63 for the first partition, therefore the first partition offset is: 63x512=32256
4. Finally, to mount the xen image, use: mount -o loop,offset=32256  test.img /foldername
               
               
               

本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u/22677/showart_2009138.html