LinuxQuestions.org - help mounting image from .img file

- Linux - Newbie (https://www.linuxquestions.org/questions/linux-newbie-8/)

- - help mounting image from .img file (https://www.linuxquestions.org/questions/linux-newbie-8/help-mounting-image-from-img-file-4175480582/)

help mounting image from .img file

I tried the following , and all worked up until the point where I try to mount,then it give error saying needs to specify FS, but my partition say lvm ,and dont remember what fs I used.

Quote:

file -s /Downloads/usb/backup_set_1.img
/Downloads/usb/backup_set_1.img: x86 boot sector; GRand Unified Bootloader, stage1 version 0x3, boot drive 0x80, 1st sector stage2 0xb441; partition 1: ID=0x83, active, starthead 1, startsector 63, 211617 sectors; partition 2: ID=0x8e, starthead 0, startsector 211680, 116998560 sectors, code offset 0x48

Code:

parted /Downloads/usb/backup_set_1.img 

GNU Parted 2.1

Using /Downloads/usb/backup_set_1.img

Welcome to GNU Parted! Type 'help' to view a list of commands.

(parted) unit                                                            

Unit?  [compact]? B                                                      

(parted) print                                                            

Model:  (file)

Disk /Downloads/usb/backup_set_1.img: 60011642880B

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

Partition Table: msdos



Number  Start      End          Size          Type    File system  Flags

 1      32256B      108380159B    108347904B    primary              boot

 2      108380160B  60011642879B  59903262720B  primary              lvm

2nd

Code:

 kpartx -a /Downloads/usb/backup_set_1.img 



ll /dev/mapper/

total 0

crw-rw----. 1 root root 10, 58 Oct 13 02:37 control

lrwxrwxrwx. 1 root root      7 Oct 13 02:47 loop0p1 -> ../dm-3

lrwxrwxrwx. 1 root root      7 Oct 13 02:47 loop0p2 -> ../dm-4



mount -o loop /dev/mapper/loop0p2 /mnt/bac/



mount: you must specify the filesystem type



file systems -t ext3/4/2/auto all give errors

Code:

losetup /dev/loop0 /Downloads/usb/backup_set_1.img



mount -o loop /dev/loop0 /mnt/bac/

Code:

fdisk -l /Downloads/usb/backup_set_1.img 

You must set cylinders.

You can do this from the extra functions menu.



Disk /Downloads/usb/backup_set_1.img: 0 MB, 0 bytes

240 heads, 63 sectors/track, 0 cylinders

Units = cylinders of 15120 * 512 = 7741440 bytes

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

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

Disk identifier: 0x48d97f5e



                          Device Boot      Start        End      Blocks  Id  System

/Downloads/usb/backup_set_1.img1  *          1          14      105808+  83  Linux

/Downloads/usb/backup_set_1.img2              15        7752    58499280  8e  Linux LVM





mount /Downloads/usb/backup_set_1.img /mnt/bac/ -o loop,offset=$((211680*512))

mount: you must specify the filesystem type

Thank you all for you input :)

After you ran all necessary commands up to 'kpartx -a /Downloads/usb/backup_set_1.img' your system should already expose a Device-Mapped Physical Volume Group to run 'dmsetup status; pvscan /dev/dm-4' and other pv*/vg*/lv* commands on?

Thank you uspawn for your input.I ran the following commands

Code:

dmsetup status

VolGroup-lv_swap: 0 6225920 linear 

VolGroup-lv_root: 0 100171776 linear 

loop0p2: 0 116998560 linear 

loop0p1: 0 211617 linear 

VolGroup-lv_home: 0 9781248 linear 

[root@Stainless ~]# pvscan /dev/dm-4

  PV /dev/sdb2  VG VolGroup  lvm2 [55.40 GiB / 0    free]

  Total: 1 [55.40 GiB] / in use: 1 [55.40 GiB] / in no VG: 0 [0  ]

but the issue I am having is,after I normally pvcreate, then add to a vg group and lv create, I then create the file system on the lvm, then mount it. But here I dont know the filesystem again.

You can find the filesystem of a volume with the command sudo file -sL /dev/path_to/volume. If you're not sure of the volume paths, run sudo lvdisplay.

@ cbtshare

Certain img files don't mount like iso files do. You need an extra parameter to the mount command. The offset parameter. The offset parameter is needed for img files.

Code:

mount -o loop,offset=<start of offset number> file.img mountpoint

The code above has worked with img files with normal disk volumes, I never tried this with LVMs but you can try it.

Try this code below with the offset values and see if it works.

Code:

mount -o loop,offset=108380160 /Downloads/usb/backup_set_1.img /mnt/

mount -o loop,offset=32256 /Downloads/usb/backup_set_1.img /mnt/boot

The offset values in bold are from the parted output in post #1 under the Start column.

Quote:

Originally Posted by Robhogg (Post 5044982)

You can find the filesystem of a volume with the command sudo file -sL /dev/path_to/volume. If you're not sure of the volume paths, run sudo lvdisplay.

It didnt work for me...

Quote:

file -sL /dev/dm-4
/dev/dm-4: data
[root@Stainless ~]# file -sL /dev/dm-3
/dev/dm-3: data
[root@Stainless ~]# file -sL /dev/mapper/loop0p2
/dev/mapper/loop0p2: data

@WhiteR4VeN , if you look at my initial post , I tried the offset method and it didnt work.

Code:

mount /Downloads/usb/backup_set_1.img /mnt/bac/ -o loop,offset=$((211680*512))

mount: you must specify the filesystem type

Any ideas? I cant find any info on google that helps.