Revealing the secrets of Linux system startup and giving you a comprehensive understanding of the boot process

Understand and be familiar with the Linux boot process, which is very important basic knowledge for every Linux user. Please allow me to describe to you the entire process of Linux system startup in detail here, hoping to help you uncover its mysterious veil.

Here, let’s analyze the initial startup process of Linux in a simple and easy-to-understand way. The main content has 8 key points: 1. BIOS self-test and POST stage; 2. Understand the communication method between MBR and Bootloader; 3. Understand the kernel loading and initialization operations; 4. Understand each operation What role does the level and the corresponding Init process play; 5. Be familiar with the operation of startup scripts and service management mechanisms; 6. Master how to enter the graphical interface from user login; 7. Be familiar with the system mounting and initial state setting steps; 8. Finally, take a look at the final effect of the entire system startup. I hope these explanations will help you understand and use Linux more comprehensively.

1. BIOS self-test and POST

When every computer is turned on, the first thing that comes into view is the Basic Input Output System (BIOS), which automatically detects the entire system. We abbreviate this process as "Power-On Self-Test" (POST) to ensure that all hardware devices are operating correctly. Only after passing this strict entry review does it mean that the hardware device is ready to enter normal status.

2. MBR and Bootloader

Next, our BIOS will go to the MBR (Master Boot Record) part of the hard disk to find the boot loader. The function of the boot loader is to accurately place the system kernel into memory so that it can operate normally!

3. Kernel loading and initialization

The boot loader gently loads the kernel image, and after it is safely settled in the memory, it begins the initial setting of system resources, including improved memory scheduling and customization for various devices. driver.

4. Running level and init process

After loading the core file, the friendly kernel will start the init program. This is one of the earliest user-level programs in Linux systems. Next, according to the set running level linux boot process, the corresponding services and applications are gradually started.

5. Startup script and service management

If you want to change the run level, you can pay attention to the following related startup scripts, such as the files located in the neat and orderly directory /etc/rc.d/ in the system root directory. These scripts ensure the smooth startup and stable operation of various system services!

6. User login and graphical interface

thank you for your support! After the system infrastructure services are ready, please feel free to log in. Whether you prefer the fast and efficient operating experience of the command line, or choose the intuitive and clear graphical interface, you can log in as you like and enjoy convenient operations~

7. System mounting and initialization

After logging in, please rest assured that according to the requirements of the configuration file, we will quickly help you complete the mounting and initial settings of the disk partition Linux boot process, such as mounting the root Essential applications such as directories, users, and temporary directories.

8. System startup completed

When all services and subsystems are successfully started, the booting of the Linux operating system can come to an end. Starting from now on LINUX deleting directories, dear users will be able to fully enjoy the convenience brought by various functions.

Congratulations on your further understanding of the startup mechanism of the Linux operating system by reading our article "In-depth Analysis of the Linux Boot Process". This kind of knowledge reserve will undoubtedly provide great convenience for you to carry out troubleshooting and system optimization. Thank you very much for taking the time to read this article, and I look forward to it being of substantial help to you!

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