Boot Process

Overview

• Lilo
• The etc rc.d and init business

The Init Process

• The Init Process and run levels
• Init is the first process started, so it has an ID number of 1: run ps -aux at command line
• 0: Halt the system
• 1: Enter single user mode
• 2: Multiuser mode, no NFS
• 3: Normal, or full multiuser mode
• 4: Unused
• 5: Same as 3, but start in GUI mode
• 6: Reboot the system

The rc.d Directory

• There is a subdirectory for each run level
• The etc/rc.d directory contains directories called rc0.d, rc1.d, rc2.d, rc3.d, rc4.d and rc5.d
• The /etc/rc script decides which directory to call
• Directories have files with names in them like K01ppoe or S10network
• Each of these files are soft links. Use ln -s to create a softlink.
• The K stands for kill, the S for start

Customization

• You can customize the boot process by editing rc.local
• rc.local is always executed last
• For more advanced customization, you can change the boot process by creating your links