kvm的img文件的本机挂载

非lvm分区挂载方法:

mount -o loop xxx.img /mnt/xxx

系统提示：

“mount: you must specify the filesystem type”

执行：fdisk -ul xxx.img，和显示一大堆信息，如：

Disk 3059.img: 4294 MB, 4294967296 bytes

255 heads, 63 sectors /track , 522 cylinders, total 8388608 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical /physical ): 512 bytes / 512 bytes

I /O size (minimum /optimal ): 512 bytes / 512 bytes

Disk identifier: 0x000bdbdc

Device Boot Start End Blocks Id System

3059.img1 * 63 7903979 3951958+ 83 Linux

3059.img2 7903980 8385929 240975 5 Extended

3059.img5 7904043 8385929 240943+ 82 Linux swap / Solaris

看到这行，发现linux的文件系统是从第63块开始的，所以挂载的时候应该从这个地方开始挂载

3059.img1 * 63 7903979 3951958+ 83 Linux

由这条信息可以的出，扇区大小为512

Units = sectors of 1 * 512 = 512 bytes

所以我们需要从512*63出开始挂载

最后执行：

mount -o loop,offset=32256 xxx.img /mnt/xxx……

lvm分区挂载方法：

[root@jay-linux image]# fdisk -lu rhel6u2.img
You must set cylinders.
You can do this from the extra functions menu.
 
Disk rhel6u2.img: 0 MB, 0 bytes
255 heads, 63 sectors/track, 0 cylinders, total 0 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00048b34
 
      Device Boot      Start         End      Blocks   Id  System
rhel6u2.img1   *        2048     1026047      512000   83  Linux
Partition 1 does not end on cylinder boundary.
rhel6u2.img2         1026048   104857599    51915776   8e  Linux LVM
Partition 2 has different physical/logical endings:
     phys=(1023, 254, 63) logical=(6527, 21, 22)
[root@jay-linux image]# echo $((1026048*512))
525336576
[root@jay-linux image]# losetup /dev/loop0 rhel6u2.img -o 525336576
[root@jay-linux image]# pvscan
  PV /dev/loop0   VG VolGroup   lvm2 [49.51 GiB / 0    free]
  Total: 1 [49.51 GiB] / in use: 1 [49.51 GiB] / in no VG: 0 [0   ]
[root@jay-linux image]# vgchange -ay VolGroup
  2 logical volume(s) in volume group "VolGroup" now active
[root@jay-linux image]# lvs
  LV      VG       Attr     LSize  Pool Origin Data%  Move Log Copy%  Convert
  lv_root VolGroup -wi-a--- 45.57g
  lv_swap VolGroup -wi-a---  3.94g
[root@jay-linux image]# mount /dev/VolGroup/lv_root /media/
[root@jay-linux image]# ls /media/
bin   cgroup  etc   lib    lost+found  misc  net  proc  sbin     srv  tmp  var
boot  dev     home  lib64  media       mnt   opt  root  selinux  sys  usr
 
（使用完后的卸载操作，如下）
[root@jay-linux image]# umount /media/
[root@jay-linux image]# vgchange -an VolGroup
  0 logical volume(s) in volume group "VolGroup" now active
[root@jay-linux image]# losetup -d /dev/loop0
 
总结：
   参考了如下博客：
            https://my.oschina.net/toyandong/blog/65002
            http://blog.csdn.net/lucien_cc/article/details/11158055