Re: [Xen-users] Viewing the content of *.img file

[Flavio <fbcyborg@xxxxxxxxx>]

On 23 October 2011 06:33, Andrew Bobulsky <rulerof@xxxxxxxxx> wrote:
> On Oct 23, 2011, at 12:06 AM, Scott Meyers <scottmeyers@xxxxxxxx> wrote:
>
> None of the suggestions worked. I really need help with this. Any body knows 
> how?
Hello,

maybe this is the same problem I bumped into few weeks ago.
If the img file contains only one partition, it is simple, because you
can mount the file
like the following: mount -o loop file.img /mnt/loop .
Stated that, the problem is when the img file contains more than one partition.
I've seen the partition table performing:
fdisk -l file.img

For example, my centos-5.0.img file:
# fdisk -l centos-5.0.img

Disk centos-5.0.img: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders, total 16777216 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: 0x000c0244

         Device Boot      Start         End      Blocks   Id  System
centos-5.0.img1   *          63      208844      104391   83  Linux
centos-5.0.img2          208845    16771859     8281507+  8e  Linux LVM

I can see there are two partitions.
To mount the first partition, you must consider the number 63.
63x512=32256
#mount -o loop,offset=32256 centos-5.0.img /mnt/loop/
# ls /mnt/loop/
config-2.6.18-274.7.1.el5xen      lost+found
System.map-2.6.18-274.el5xen   xen-syms-2.6.18-274.7.1.el5
config-2.6.18-274.el5xen          message
vmlinuz-2.6.18-274.7.1.el5xen  xen-syms-2.6.18-274.el5
grub                              symvers-2.6.18-274.7.1.el5xen.gz
vmlinuz-2.6.18-274.el5xen
initrd-2.6.18-274.7.1.el5xen.img  symvers-2.6.18-274.el5xen.gz
xen.gz-2.6.18-274.7.1.el5
initrd-2.6.18-274.el5xen.img      System.map-2.6.18-274.7.1.el5xen
xen.gz-2.6.18-274.el5

Further information at: http://wiki.edseek.com/guide:mount_loopback

As regard the LVM partition, I always get an error, but it is related
to another issue and
I haven't yet figured out hou to solve.
# mount -o loop,offset=106928640 centos-5.0.img /mnt/loop/
mount: unknown filesystem type 'LVM2_member'

Hope this helps.
--
Flavio

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