[CentOS] 8.2.2004 Latest yum update renders machine unbootable

Sat Aug 1 22:26:15 UTC 2020
Strahil Nikolov <hunter86_bg at yahoo.com>

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 at daku.org> 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
>>>>What are the conditions that permit the breakage? There is a
>>>>configuration (hw/sw) case that match always the problem or it is
>>>>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.
>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.
>CentOS mailing list
>CentOS at centos.org