Linux boot process diagram

Firmware firmware (Cmos/bios) #POST加电自检

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Bootloader bootloader (GRUB) #载入内核/boot/grub/grub.conf

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Load Kernel Kernel # Drive hardware

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Start process init (PID constant is 1,pid to 0 for kernel Scheduler kernel Scheduler)

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Read execution configuration file/etc/inittab

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Judging RunLevel (Initdefault)

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Read the configuration file (/etc/rc.d/rc.sysinit) #系统的基本服务的加载

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Then execute the/ETC/RC.D/RC #来判断运行级别对应的配置文件

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Run the secondary directory to the level of/ETC/RC.D/RCN.D n=0~6

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Verify user name, password

/etc/inittab si:sysinit:/etc/rc.d/rc.sysinit Regardless of the level of execution of the program configuration.

/etc/rc.d/rc.sysinit, is to start the script file, complete the system service program startup, such as: System environment variable settings, set the system clock, load fonts, check the loading file system, generate system boot log files and so on.

/ETC/RC.D/RCN. D manages the runlevel and initializes the configuration of the launcher.

Run different configurations according to RunLevel, run Level 3, call configuration information under the RC3.D directory ;

The RC 0/1/2/3/4/5/6.D directory has:For exampleS syslog, K theDundWait, all is/etc/init.d/... A soft connection

which

Capital S means: Start program

Uppercase K: programs that are closed or not started

Digital representation: the sequential start.

(The lowercase system is not recognized.) )

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Linux boot process diagram