<snip> >Your system was most likely rebuilding the initrd, and you interrupted >it leaving you with a broken initrd. > >Try booting off a rescue disk and chroot into the install, and run: > >dracut -f -v > >to regenerate all the initrds. > >Also, you don't need to reinstall the kernel but just do a 'yum >update' to get everything up to the latest release. The shim package >with the fix is the latest. > >-- >Jonathan Billings <billings at negate.org> >___ Jonathan et al: On the assumption that all the updates should now "just work", I did a from-scratch reinstall of a minimal Centos 7 system starting from netinstall and added software that I've always added (perl, dhcp, mariadb, etc). I did not exclude shim, etc in "/etc/yum.conf". After all the updates, the system was NOT bootable. I repeated the install and updates, but this time including the line in /etc/yum.conf exclude=grub2* shim* mokutil and ended up with a usable system. This was not the result I was hoping for. David