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 >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 > >_______________________________________________ >CentOS mailing list >CentOS at centos.org >https://lists.centos.org/mailman/listinfo/centos