On 11/27/2020 02:11 AM, Ralf Prengel wrote: > Simple question > did you try a centos live cd with a all tools to open the system? > Perhaps the easiest way when not trained every day restoring files. > Ralf > > Von meinem iPad gesendet > >> Am 26.11.2020 um 20:11 schrieb H <agents at meddatainc.com>: >> >> Running CentOS 7 I have a previously combined backup of a disk with three partitions using dd. I now need to restore one single file from this backup and after perusing the internet, specifically https://unix.stackexchange.com/questions/31669/is-it-possible-to-mount-a-gzip-compressed-dd-image-on-the-fly, I have done the following: >> >> - installed squashfs-tools >> >> - installed kpartx >> >> - made a squash image of the dd backup and mounted it >> >> - used kpartx to create devices for the three partitions under /dev/mapper/loopNpP >> >> - I can now mount the first partition, which is the EFI partition, and access it >> >> - the second partition, the boot partition, fails to mount since it has the same UUID as the disk I am using in the computer, and of which it is an earlier dd backup. Since I am not interested in the boot partition - at least not right now - I moved on. >> >> - I am, however, interested in the third partition which is LUKS encrypted. Running 'cryptsetup luksOpen /dev/sda3 my_encrypted_volume' I can decrypt it with the password >> >> - trying to mount the decrypted version with 'mount /dev/mapper/my_encrypted_volume /media/my_device' results in a failure message 'mount: unknown filesystem type 'LVM2_member' >> >> - another website, https://askubuntu.com/questions/766048/mount-unknown-filesystem-type-lvm2-member, suggests I could run vgdisplay to get the UUID and then rename it using vgrename >> >> But, vgdisplay shows only one vg and I am afraid to rename the VG UUID shown by vgdisplay since it might refer to the VG currently in use... >> >> Does anyone have any insight or suggestions into the above and how to proceed while being absolutely certain I will not be messing up the running part of the system? >> >> Thanks! >> >> _______________________________________________ >> CentOS mailing list >> CentOS at centos.org >> https://lists.centos.org/mailman/listinfo/centos > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos No, for two reasons. One, I am not trying to restore the entire system, only one file from the dd backup. Second, this is also a training run for the future.