Re: CentOS 7: restore fails [SOLVED]

On 4/5/2017 5:22 μμ, Nikolaos Milas wrote:

> How can we fix this cloned CentOS 7 installation to become bootable?
>

Through an investigation in the CentOS mailing list, we found the solution.

The problem is caused by a bug in xfs in combination with CentOS 7.3. 
So, it occurs when the boot partition is formatted as xfs.

Details of the bug are here:

    https://bugzilla.redhat.com/show_bug.cgi?id=1399487

The solution:

After restoring a backup:

1. Boot using CentOS installation media and enter Troubleshooting mode

2. Unmount the boot partition and run the command:

    xfs_admin -U restore /dev/vdal

3. This provides a new UUID to the boot partition and enables 
recognition of the partition filesystem (as xfs).

4. Mount the boot partition again, chroot to /mnt/sysimage/ and run:

    grub2-install /dev/vda

5. Edit /etc/fstab and replace the existing boot partition UUID with the 
one generated at step 2 above.

6. Exit, Reboot.

Done!

That was a VERY tricky one. It almost drove me crazy.

I don't know if mondo/mindi should or could be modified to take into 
account this problem, to help users avoid needing to follow the above 
process.

In any case, I do wish the above may prove useful to someone!

Cheers,
Nick


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