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Linux Fundamentals: System load process and runlevel meaning

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The BIOS has a cure code pointing to mbr,mbr pointing to Grub (/boot/grub/has a lot of boot configuration information), and grub can configure a variety of Linux kernel vmlinux files. Starting the kernel starts loading various driver modules and initializing the system. System initialization mainly reads/etc/inittab (specify default runlevel) and/etc/init/under various profiles (specify default startup service, number of endpoints, shortcut keys ...). ), the system starts to complete after running. System Run Level 0-shutdown 1-Single user 2-multiuser without network mode 3-multiuser 4-No 5-GUI 6-Restart Enter init number on the command line to switch the run level change root password can only be performed at single user run level

Linux Fundamentals: System load process and runlevel meaning

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