With CentOS/RHEL 7 there are a couple of changes (compared to CO/RHEL 6). One of it is the use of grub2 instead of grub.
Per default the OS seems to use a UUID to "find" the boot-device.
Is there an easy to use receipe to get back to device-names (like /dev/sda1) instead?
Background of the question: I am intending to clone additional VMs from a template. Base is a new (virtual) disk device with a different UUID.
If I can not revert to sda1 I will need to change the UUID of the clone in the grub.cfg to the new UUID - which is plan "B".
The kernel-parameter for root= will be changed to the disk - see the answer from Thomas below.
There remains a problem with this section, generated by grub2-mkconfig:
if [ x$feature_platform_search_hint = xy ]; then search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 --hint='hd0,msdos1' 716433ab-9e30-42a7-a272-6c66243499d2 else search --no-floppy --fs-uuid --set=root 716433ab-9e30-42a7-a272-6c66243499d2 fi
This still contains the search for the UUID. If it can't be found, the boot-process will go to error "not found" or something like that. After pressing ENTER the system will boot up ok.
The remaining Q is how to inactivate that section (I did not find the place to disable the feature_platform_search_hint)?