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