How to Boot CentOS 7 in Rescue Mode Step by Step

Rescue mode provide facility to boot a small CentOS 7 Linux environment from boot method using ISO Image or bootable media.

 

Step 1. Downloading ISO Image: Download ISO image from the CentOS official site and boot the virtual machine from the downloaded ISO image.

 

Step 2. Begin booting in Rescue Mode: Attach the ISO image into virtual machine and start/reboot the virtual machine and follow the instructions. Select “Troubleshooting” and press [Enter] key as shown in below screenshot.

Step 3. Rescue Mode Selection: Follow the instructions and Select “Rescue a CentOS system” and press [Enter] key as shown in below screenshot.

 

Step 4. Local Environ selection: The rescue mode attempt to locate the old installation and mount it with read write mode under /mnt/sysimage directory, select 1 and press [Enter] as shown in below screenshot:

 

Step5: Entering in Local Root Environment: Now you can run chroot /mnt/sysimage to change root directory from rescue mode to installed old root file system as shown in below screenshot:

 

Done. Booting in rescue mode done.