Mounting / Unmounting KVM Image
From Leo's Notes
Last edited on 1 September 2019, at 06:21.
Suppose you have a KVM virtual machine using a virtual disk located in a LV group. To gain access to the data, use kpartx.
To list partitions in the disk image:
# kpartx -l /dev/vol_vm1/kvm101_img vol_vm1-kvm101_img1 : 0 61861441 /dev/vol_vm1/kvm101_img 63 vol_vm1-kvm101_img2 : 0 1048576 /dev/vol_vm1/kvm101_img 61861504
Knowing that the first partition is / and the second is the swap, we will attempt to mount the first partition.
To map the parititions:
# kpartx -av /dev/vol_vm1/kvm101_img add map vol_vm1-kvm101_img1 (253:6): 0 61861441 linear /dev/vol_vm1/kvm101_img 63 add map vol_vm1-kvm101_img2 (253:7): 0 1048576 linear /dev/vol_vm1/kvm101_img 61861504
To mount the newly mapped partitions:
# mount -t ext4 -o ro /dev/mapper/vol_vm1-kvm101_img1 /mnt/vm101
Once completed, simply unmount and unmap the image:
# umount /mnt/vm101 # kpartx -d /dev/vol_vm1/kvm101_img