Booting CentOS/RHEL 7&8 in to Emergency mode / Recovery mode

Procedure:


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 systemd.unit=emergency.target 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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