Three years of ice-drinking-ai-linux-06 system start-up process and safety

System startup process

BOIS (Basic input/output System) basic input/output system: The interface between hardware and software, and is a very basic interface.

Grub (Grand Unified BootLoader) Multi-os launcher:/etc/grub.conf Here's a grub.conf more important

Boot kernel: init config file, exists in/etc/inittab. There are 7 ways to start, and you can set the default boot mode

　　

1: Enter the system via "single user mode" and change the root password

When the system starts, when the bootloader reads the kernel information, modifies the contents of the Init execution and selects single-user mode

Press "E" to enter edit state

Select Kernel kernel edit, continue to press "E"

Blank 1 Enter after completion

Press B to return to boot and boot again

1.5: Because the operating system has been modified in the grub file, it can be set by GRUB encryption

Enter the editing state of the/etc/grub.config file

You can use the plaintext password directly or you can encrypt it. Get 123 and show it after MD5 encryption

The password is required when the system switches to a single user again.

2: Enter through the Bois rescue mode

Select CD to start, start with a third rescue mode, set the keyboard language

The original system was hung under the mnt/sysimage.

We can view the files under Mnt/sysimage

Next Remove encryption

OK again reboot need to change to normal start, Operation 1 step

2.5 We can set permissions for BIOS

The password is required to enter the BIOS again

Three years of ice-drinking-ai-linux-06 system start-up process and safety