Mounting disk images on Linux is fairly straight forward, however an image with a Logical Volume Manager (LVM) partition requires a little more attention. The first thing I do is find out some information about the image(s):
root@box:# fdisk -l -o Device,Type,Size disk.img Device Type Size disk.img1 Linux 1G disk.img2 Linux LVM 952.9G
-l lists the partition table and -o outputs the columns specified. This particular image has two partitions one of which is an LVM parition. In order to access this space we need to mount the image. I chose to use udiskctl, but you are free to use your own method:
root@box:# udisksctl loop-setup -f disk.img Mapped file disk.img as /dev/loop0.
We saw earlier that there is an LVM partition so we check for the volume group (VG) name:
mech@box(tmp):$ sudo vgs VG #PV #LV #SN Attr VSize VFree rhel 1 6 0 wz--n- 952.87g 4.00m slack 2 6 0 wz--n- 1.36t 0
rhel is the volume group name for the disk image that was just mounted and slack is the name for my existing SSD. Now we need to activate the volume group:
mech@box(tmp):$ sudo vgchange -ay rhel 6 logical volume(s) in volume group "rhel" now active
Activating the VGs exposes the logical volumes (LV), which is where our ext3, xfs, or btrfs file system will reside. For this instance I only care about the root (/) and home (/home) directories. To mount them we do the following:
mech@box(tmp):$ sudo udisksctl mount -b /dev/mapper/rhel-home Mounted /dev/dm-13 at /run/media/root/0d36e505-f9b6-44e8-89e1-677a919fa983. mech@box(tmp):$ sudo udisksctl mount -b /dev/mapper/rhel-root Mounted /dev/dm-12 at /run/media/root/5c7a263e-ac51-496d-8454-d34cddf99161.
A quick look at what was mounted:
mech@box(Downloads):$ df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/rhel-root 100G 23G 78G 23% /run/media/mech/5c7a263e-ac51-496d-8454-d34cddf99161 /dev/mapper/rhel-home 400G 2.3G 398G 1% /run/media/mech/0d36e505-f9b6-44e8-89e1-677a919fa983
To unmount you can use udiskctl or dmsetup:
mech@box(Downloads):$ udisksctl unmount -b /dev/mapper/rhel-home Unmounted /dev/dm-13. mech@box(Downloads):$ udisksctl unmount -b /dev/mapper/rhel-root Unmounted /dev/dm-12.
Using dmsetup we get:
dmsetup remove /dev/mapper/rhel-*
Thanks for reading.