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学习一下Linux操作系统启动流程

  • 2026-07-01 11:46:28
学习一下Linux操作系统启动流程
为了更好的了解linux，系统学习一下Linux操作系统的启动流程
1、POST加电自检，首先加载BIOS，检测硬件和设置是否 正确，然后按照设置顺序进行启动。
2、读取BIOS信息，查找硬盘MBR引导扇区，将其内容复制到Boot Loader，然后进行引导。
3、计算机读取内存中的GRUB配置信息后，根据信息启动硬盘中的操作系统。
4、计算机读取内存映像，并进行解压缩，屏幕一般会提示“Uncompressing Linux”的提示，解压缩完成后，会提示“booting the kernel”。系统将解压后的内核放到内存中，并调用start_kernel()函数来启动一系列的初始化函数并初始化各种设备，完成Linux核心环境的建立。
5、内核加载完毕，会启动Linux系统第一个守护进程init，然后通过该进程读取/etc/inittab文件，/etc/inittab文件用来设定Linux的运行等级：0表示关机模式；1表示单用户模式；2表示无网络支持的多用户模式；3表示字符界面多用户模式；4表示保留；5表示图形界面多用户模式；6表示重新引导系统，重启模式。
6、计算机读取完运行级别，Linux执行的第一个用户文件/etc/rc.d/rc.sysinit，这个文件功能包括设定PATH运行变量、网络配置、启动swap分区、设定/proc、系统函数、配置Selinux等。
7、读取/etc/modules.conf文件和/etc/modules.d目录下的文件来加载系统内核模块。
8、根据之前的运行级别，系统会运行rc0.d到rc6.d对应的脚本程序，完成相应的初始化和启动相应的服务。其中以S开头表示系统即将启动的程序，以K开头，则表示停止该服务。S和K后紧跟的数字为启动顺序编号
9、系统启动相应服务之后，会读取执行/etc/rc.d/rc.local文件，可以将需要开机启动的任务加入到该文件末尾，系统会逐行执行并启动相应命令。银河麒麟没有该文件，需要手动创建。
10、执行/bin/login程序，启动到系统登录界面，输入用户名和密码，就可以登录到shell终端了，系统启动完毕
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  139. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/runtime/temp/067d451b9a0c665040f3f1bdd3293d68.php ( 11.98 KB )
  140. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000485s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000653s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002066s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003287s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000557s ]
  6. SELECT * FROM `set` [ RunTime:0.013947s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000778s ]
  8. SELECT * FROM `article` WHERE `id` = 493561 LIMIT 1 [ RunTime:0.007937s ]
  9. UPDATE `article` SET `lasttime` = 1783073503 WHERE `id` = 493561 [ RunTime:0.003159s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000570s ]
  11. SELECT * FROM `article` WHERE `id` < 493561 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001276s ]
  12. SELECT * FROM `article` WHERE `id` > 493561 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001362s ]
  13. SELECT * FROM `article` WHERE `id` < 493561 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005512s ]
  14. SELECT * FROM `article` WHERE `id` < 493561 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005390s ]
  15. SELECT * FROM `article` WHERE `id` < 493561 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003749s ]
0.133571s