vim /boot/efi/EFI/centos/grub.cfg
linuxefi /vmlinuz-3.10.0-1160.el7.x86_64 root=UUID=2f2e1332-8ef3-413f-8ae4-38babff38e31 ro crashkernel=auto rd.md.uuid=cd3c45c8:528a1913:b0fc080d:a5caaf2d rd.md.uuid=a1e77faa:bfd28b93:95b07a07:3c6a62ac rd.md.uuid=61bd0b44:31ee96f1:a505ba2b:d3bcff20 rhgb quiet LANG=en_US.UTF-8 isolcpus=1-7 rcu_nocbs=1-7 nohz_full=1-7
