Linux Learning Note: CentOS 5/6 startup process

CentoS 6 start the process:

1. Load the BIOS hardware information to get the first boot device .

2. Read the boot loader (grub) information for the first boot device MBR

3. Load core operating system kernel information, the core begins to decompress, (load initramfs.img) and attempts to drive all hardware devices.

4. The kernel executes the INIT program and obtains the running information.

5.Init execute the/etc/rc.d/rc.sysinit file.

6. Launch the core plug-in module (/etc/modprobe.conf).

7.Init execution of individual batch files (scripts).

8.Init execution/etc/rc.d/rc.local. (Login screen appears)

9. Execute the/bin/login program and wait for the user to log in.

10. Start with the Shell to control the host after logging in.

Approximate: POST--Bootsequence (BIOS)--Bootloader-Kernel [-->ramfs]-->rootfs (RO)--/sbin/init--> ; Set default RunLevel--system initialization--can be executed in parallel Ctrl+alt+del hotkey function definition, system service on and off, power management, Dbus management, etc.--login prompt

Linux Learning Note: CentOS 5/6 startup process