非lvm分區掛載方法:
mount -o loop xxx.img /mnt/xxx
系統提示：
“mount: you must specify the filesystem type”
執行：fdisk -ul xxx.img，和顯示一大堆信息，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
|
看到這行，發現linux的文件系統是從第63塊開始的，所以掛載的時候應該從這個地方開始掛載
3059.img1 * 63 7903979 3951958+ 83 Linux
由這條信息可以的出，扇區大小為512
Units = sectors of 1 * 512 = 512 bytes
所以我們需要從512*63出開始掛載
最后執行：
mount -o loop,offset=32256 xxx.img /mnt/xxx……
lvm分區掛載方法：
[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
（使用完后的卸載操作，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
總結：
參考了如下博客：
https://my.oschina.net/toyandong/blog/65002
http://blog.csdn.net/lucien_cc/article/details/11158055