Linux Grbu system Repair

Repair of Linux Systems

First, the basic knowledge review

This content is based on a certain understanding of Linux boot-up process and system.

In the beginning of the Linux system repair, first talk about the WinDOS pe,windos PE This tool is provided to us to install WinDOS system and repair system use, when the WinDOS system problems, we can try to use F8 into Safe Mode repair system, if not successful, We use PE for repair. Linux also provides a tool for us to repair the system, but the Linux repair tool is the disc image, the CD-ROM installation system of the third option, rescue installed system, now with me to learn, how to solve the Linux system repair small problem it!

Second, the experiment

One, the grub information on the MBR is lost and corrupted

1, the simulation of the grub information on the MBR loss damage

DD If=/dev/zero OF=/DEV/SDA count=1 bs=400

2. Enter Disc Repair mode

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Select language

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Select network mode

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Configuring network cards to enable networking

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Prompt information

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Focus on how this goes into this pattern.

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into the rescue mode to provide us with a small operating environment

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2. Start repairing grub information on MBR the first method of losing damage is the first step

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Step Two

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3. The second method of repairing grub information loss on MBR

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4. Reboot to finish repairing grub information on the MBR is missing and damaged.

Second, the repair method of/boot/grbu damage

1, Analog/boot/grbu damage

Mv/boot/grub/tmp

2, enter the rescue mode to repair the first step

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3. Edit the configuration document/boot/grub/grub.conf

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Last configuration modified version of the document

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4, restart Reboot/boot/grub damage will be repaired.

Third, reinstall/bin/bash/de repair method

1, Analog/bin/bash damage

Mv/bin/bash/tmp

2. Reboot into the rescue mode under bash environment Mount chroot/mnt/sysimage/

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3. Mount successfully and mount a disc that matches the current system software package

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4. Install Bash Pack

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Iii. Summary

For the Linux system rescue, I just talk about the basic operation method, I think to do Linux operations this line, like these basic disk partitions, System rescue, RAID must be mastered, to be skilled, otherwise the real in production environment, basic services can not solve, Don't think about the high-level and operational issues.