tutorial - HowTo boot the system into Resuce/Single-User or Emergency Mode

Booting into Rescue Mode

Rescue mode provides the ability to boot a small Linux environment entirely from CD-ROM, or some other boot method, instead of the system's hard drive.

As the name implies, rescue mode is provided to rescue you from something. During normal operation, your Linux system uses files located on your system's hard drive to do everything — run programs, store your files, and more.

Once you have booted using bootable disk, add the keyword rescue as a kernel parameter.

linux rescue

Booting into Single-User Mode

One of the advantages of single-user mode is that you do not need a boot CD-ROM; however, it does not give you the option to mount the file systems as read-only or not mount them at all.

In single-user mode, your computer boots to runlevel 1. Your local file systems are mounted, but your network is not activated.

use the following steps to boot into single-user mode:

1.At the GRUB splash screen at boot time, press any key to enter the GRUB interactive menu.
2.Select Linux with the version of the kernel that you wish to boot and type a to append the line.
3.Go to the end of the line and type single as a separate word (press the Spacebar and then type single). Press Enter to exit edit mode.

Emergency Mode

In emergency mode, you are booted into the most minimal environment possible. The root file system is mounted read-only and almost nothing is set up. The main advantage of emergency mode over single-user mode is that the init files are not loaded. If init is corrupted or not working, you can still mount file systems to recover data that could be lost during a re-installation.

To boot into emergency mode, use the same method as described for single-user mode, with one exception, replace the keyword single with the keyword emergency.

Reference: Here 


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source:http://linuxpoison.blogspot.com/2008/03/135781758015314.html

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