Boot CentOS / RHEL 7 & 8 into Emergency Mode / Recovery Mode

As a Linux administrator, you may need to troubleshoot certain instances and fix boot issues. This is usually achieved by booting the system into emergency / recovery mode from the Grub menu. In this guide, you will learn to diagnose problems and recover the system from emergency mode.

Boot CentOS / RHEL 7 & 8 Linux into Emergency / Recovery Mode

Power on your RHEL / CentOS 7/8 LInux machine. When the bootloader menu appears, press Enter Interrupt countdown.

press Ë Key to edit the current entry so that we can modify the default boot loader entry and log into emergency mode.

Boot CentOS / RHEL 7 & 8 into Emergency Mode / Recovery Mode

Now use the cursor keys to navigate tolinux. You need to attachsystemd.unit=emergency.targetTo the end of the line

press Ctrl + X Key to start with the modified configuration.

Login to Emergency situations Enter the mode by entering the root password.

Boot CentOS / RHEL 7 & 8 into Emergency Mode / Recovery Mode

Reinstall using mount command / File system read / write. This will enable you to edit the file system.

# mount -o remount,rw /

You should be able to rescue a failed system from emergency mode. See more Linux guides below.

label:

  • Boot CentOS 8 / CentOS 7 to Recovery Mode
  • Boot CentOS 8 / CentOS 7 into emergency mode
  • Start CentOS 8 / CentOS 7 in single user mode
  • Boot RHEL 8 / RHEL 7 into single-user mode
  • Boot RHEL 8 / RHEL 7 into Recovery Mode
  • Boot RHEL 8 / RHEL 7 into emergency mode
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