Fix Initramfs file and forget root password solution

One, repair Initramfs files (take CentOS 6 as an example)

Friendship Tip : Do a snapshot before the experiment, avoid the wrong operation and cause the machine not to start normally

Introduction to Startup files:

Core file:/boot/vmlinuz-version-release

RAMDisk: Auxiliary pseudo-root system

CentOS 5:/boot/initrd-version-release.img

centos6,7:/boot/initramfs-version-release.img

Module file:/lib/modules/version-release

Experimental steps:

1. Delete the initramfs-version.img file under/boot

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2, restart the system, when you see the progress bar quickly press the ESC key to enter the boot menu interface

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4, press the [Enter] key directly

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5, press the TAB key, and when the cursor jumps to No, press the [Enter] key

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6, select Continue

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7, press [Enter]

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8. Open the Shell interface and enter rescue mode

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9, restart the system, and the familiar interface, to congratulate you, repair success

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Second, the solution of forgetting root password

As long as you can enter and mount/, and then reset the root password, you can save back. This is because in the startup process, if the kernel is forced to enter Runleverl 1, the default is no need for a password to get a root shell to rescue

Operation Flow:

1. Reboot the system

2. After booting into the Grub menu, press ' E ' on the menu you want to enter to enter the detailed settings, move the cursor over the kernel and press ' a ' key to enter the editing interface, then the following interface will be processed:

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Description of the key:

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The point is that the special font (plus 1, S, S, and single on the RHGB) press [Enter] to launch into one-user maintenance mode.

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3, after entering the single-user maintenance mode, the system will give you a shell directly with root privileges, at which point you will be able to execute the "passwd" command to reset the root password. Then directly execute "Init 5" can be switched to the X window or "Init 3" into the pure character interface or direct "reboot".

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4, and return to the familiar interface:

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Fix Initramfs file and forget root password solution