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@xxxxxxxxxxxxxx>:
>>
>> 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!
>>
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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.
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