Booting CentOS/ RedHat OS in Single-User Mode (In case you lost Root Password)
You can to boot single-user mode. If the system boots, but does not log in when it has completed booting, you should try single-user mode. If you are using GRUB, use the following steps to boot from single-user mode: If you have a GRUB password configured, type p and enter the password. Select CentOS/RedHat Linux with the version of the kernel that you wish to boot and type e for…