Start your RHEL / CentOS 7/8 Linux machine. Upon the boot-loader appears, press any key except Enter to interrupt the countdown.


Now press "e" key to alter the current entry, where we can modify the default boot-loader entry and log in to emergency mode.


With the cursor keys, you can navigate to the line that starts with Linux. Also, need to append to the end of the line.


Later press  Ctrl + x key to boot using the modified configuration.


Log in to the emergency mode by entering the root password.


Use the mount command to remount the / file system read/write. This will enable you to edit the file system.

# mount -o remount,rw /


You should be able to rescue a broken system from the emergency mode. 

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