linux boot process
1. BIOS loads first stage boot loader from the first sector of available disks (floppy, hard drive, cd-rom, etc.)
2. First stage boot loader then loads the second stage boot loader.
3. Second stage boot loader allows user to choose what kernel to boot.
4. Chosen kernel then booted and devices are initialized.
5. Kernel then executes init process.
6. Init starts services according to /etc/inittab:
rc - Configures services based on runlevel
rc.local - Configures any system specific information (deprecated).
Other, runlevel specific services started according to /etc/inittab.
Viewing boot up information.
Boot information displayed during boot up is stored in /var/log/dmesg.
Use dmesg command to view.
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