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101.2 Boot the System


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dmesg
Extracts information about the boot process and can be viewed with the command directly
kernel
This is the main part of the Linux operating system, it is responsible for the entire OS, threads, devices, filesystems and video
BIOS
This is responsiblefor preparing the system to boot, finding the CPU, memory, and disk in order to begin the boot process
/var/log/messages
Contains detailed post boot messages for your system as well as messages/errors/information from applications that communicate with your kernel, kernel modules (drivers, etc) - often referred to as the container of "global system messages"
/var/log/dmesg
This file contains dmesg information [Kernel ring buffer information]
1
[Boot task #?] CPU starts and then runs the BIOS
2
[Boot task #?] BIOS checks for hardware, configuring hardware and looking for a boot sector. (Newer systems can use EFI/UEFI instead of BIOS)
3
[Boot task #?] Boot loader (grub) takes over for the BIOS
4
[Boot task #?] Find a kernel, load it into memory and execute it
5
[Boot task #?] Kernel takes over, performs systems tasks, and loads the final process of executing the initialprogram for your system. By default, this is the program /sbin/init
6
[Boot task #?] The initial program gets the process ID (pid) of 1