1. UEFI or BIOS initialization, run POST power-on self-test
2. Select the boot device, Boot Sequence
The system startup sequence generally includes: Optical drive, USB flash drive, hard disk A, hard disk B. Search each boot device in order. The first device with a boot program is the device used for this startup.
3. Boot loader, load /boot partition file system driver
4. Load loader configuration file: /etc/grub.d/ /etc/default/grub /boot/ grub2/grub.cfg
(Recommended tutorial: centos usage tutorial)
5. Load initramfs driver module and kernel vmlinuz
6. Kernel initialization , centos7 uses systemd instead of init
7. Execute all units of initrd.target, including mounting /etc/fstab
8. Switch from initramfs and file system to the disk root directory
9. Systemd executes the default target configuration and the configuration file /etc/systemd/system/default.target
10. Systemd executes sysinit.target to initialize the system and basic.target to prepare the operating system
11. systemd starts the local and server services under multi-user.target
12. systemd executes /etc/rc.d/rc.local under multi-user.target
13 , systemd executes getty.target and login service under multi-user.target
14. Systemd executes the services required by graphical
Related video tutorial recommendations: linux video tutorial
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