Linux_grub Boot Fix issues

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test Environment: Virtualbox+Ubuntu 15.10

software version: VirtualBox graphical User Interface

Version 5.0.12 r104815

Virtual machine Run release version:centos-6.7-i386

Time:$---

Test process: Simulated /boot/grub/grub.cfg file corruption, specific operation for delete/boot/grub/ Grub.cfg This file, and then reboot.

Solution: The following is a successful case, step 2 can not add enforcing=0 this option

1. root (hd0,0)

2. kernel/vmlinuz-2.6.32-573.e16.8686 ro root=/dev/dm-0 Quiet RHGB # rear add enforcing=0

3. inid/initramfs-2.6.32-573.e16.i686.img

4. Boot

a) explanation of the parameters in step 2

i. ro Mounts the partition as read-only mode

II. root=/dev/dm-0 is the location of the specified mount root directory, because I chose LVM when I installed the virtual machine system , so instead of the normal /dev/ Sda2(of course, if you are divided into/ boot partitions, this depends on the specific situation)

iii. quiet indicates that only important information is displayed, but still all, messages that resemble hardware self-test are not shown back

iv. rhgb redhat graghic boot, you will see the picture instead of the display file information during the startup process, which can be seen by DMESG After the system is started. Of course, you can also press ESC or the UP and DOWN ARROW keys at startup to view

RHGB = Redhat graphical boot-this is a GUI mode booting screens with mnost of information hidden while the user sees a RO Tating activity icon snipping and brief information as to the computer are doing.

Quiet = Hides the majority of boot messages before RHGB starts. These is supposed to make the common user more comfortable. They get alrmed about seeing the kernel and initializing messages, so they hide them for their comfort.

Detailed configuration is as follows:

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1. There was a problem configuring the kernel leader file and the root directory location, configuring the display Kernel panic-not syncing:attempted to kill init!

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Solution: because of the previous backup, so the contents of the original Grub.cfg is viewed, the root of the original configuration file mount location is /dev/mapper/vg_server-logvol01 , so I'm in Grub the interface directly changes this path to root=/dev/mapper/vg_server_logvol01 Quiet RHGB , and then follow the previous, reboot will be no problem.

For example, here is the mount location of my root directory

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2.in the configurationkernel/vmlinuz-2.6.32-573.e16.8686 ro root=/dev/sda2Quiet RHGB,inid/initramfs-2.6.32-573.e16.i686.imgafterboot , restart prompt FATAL: Could not load/lib/moudles/2.6.32-573.12.1.316.i686 /moudles.dep:no such file no directory

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Solution: The above information can be guessed, because the kernel file corresponding to the driver file is not found, so the system load is not normal.

Since the upgrade kernel was not manually compiled, the file in my boot directory should have been generated when I executed yum update , but because of the forced abort of Yum the Run so Yum The resulting library file for the new kernel cannot be found, so the load is not successful.

Because I currently have a kernel version available on the system, so I edited the /boot/grub/grub.cfg file, the relevant new kernel inside the boot directly killed, and then the corresponding kernel files and the corresponding driver files deleted, You can start the system normally.

rm-f/boog/ vmlinuz-2.6.32-573. 12.1.E16. I 686

rm-rf/lib/modules/2.6.32-573.12.1.e16.i686/

/boot/grub/grub.cfg file modified to be able to

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Linux_grub Boot Fix issues