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Asked: 2026-06-17T12:47:41+00:00

I have built a VG named cinder-volumes. Within this VG, I created a PV

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I have built a VG named cinder-volumes. Within this VG, I created a PV named leader-volume. Then I mounted this PV as the root filesystem of a KVM Ubuntu installation. During the installation process, I selected LVM partition.
At last, I created a snapshot for the PV leader-volume.
Now I want to read some files within my Ubuntu installation… What shall I do?

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1 Answer

  1. Editorial Team

    Take a look at kpartx – it’s especially useful for managing VMs where entire file systems are often packed into single volumes.
    kpartx can create device nodes for partitions nested on a block device or disk image.

    Mount (one of the following):

    kpartx -av your_vm_disk.img

    kpartx -av /dev/mapper/your_device

    Where your_device could be an LVM partition. The -v option causes kpartx to display the devices it creates for nested partitions.

    Mount the appropriate /dev/mapper/loopXpX:

    mount /dev/mapper/loop0p1 /mnt

    Unmount (after unmounting loop devices):

    umount -d /dev/mapper/loop0 

    umount -d diskimage.img

    Remove the device mappings:

    kpartx -dv your_vm_disk.img

    kpartx -dv /dev/mapper/your_device
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