Don't forget that EL 7 (non-UEFI systems) & 8 support booting from LVM snapshot (a.k.a BOOM Boot Manager) , so revert is 2 steps away:
- boot from the snapshot (grub menu)
- revert from the lvm snapshot
- reboot and wait for the revert to complete
Best Regards,
Strahil Nikolov
На 1 август 2020 г. 23:58:27 GMT+03:00, david <david@xxxxxxxx> написа:
>At 01:03 PM 8/1/2020, you wrote:
>>On 8/1/20 6:56 AM, david wrote:
>>>At 02:54 AM 8/1/2020, Alessandro Baggi wrote:
>>>>Hi Johnny,
>>>>thank you very much for clarification.
>>>>
>>>>You said that in the centos infrastructure only one server got the
>problem.
>>>>What are the conditions that permit the breakage? There is a
>particular
>>>>configuration (hw/sw) case that match always the problem or it is
>random?
>>>>
>>>>Thank you
>>>
>>>I have two servers running Centos 7 on apple
>>>hardware (one mac-mini and one mac
>>>server). They both failed to reboot a few
>>>days ago. So perhaps whatever anti-boot bug
>>>hit Centos 8, also hit Centos 7. I can't tell
>>>what version got updated since the system
>>>simply fails to boot. I don't even get a grub
>>>screen. I'll have to rebuild the systems from scratch.
>>>
>>
>>You should be able to boot off of installation
>>media into rescue mode, and downgrade the grub2* and/or shim* RPMs.
>>
>>-Greg
>
>This is a good idea, if I knew how to
>"downgrade...". But in any event, I had decided
>to rebuild from scratch, which of course failed
>as soon as I did an yum update. So, I'm
>installing 7.8.2003 with no updates until I see
>the "all clear -- updates will no longer make
>your system unbootable" message from the Centos team.
>
>In my many years of blindly updating my
>installations, starting from the free Redhat
>distributions, through Whitehat and onto Centos,
>this is the first disaster, and luckily, it
>didn't hit all my systems. Let's hope there aren't many more.
>
>David
>
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