Lecture #3 Boot Loaders and Booting

Agenda

1. Overview of Booting and Rooting
   
   1. How does the BIOS turn control over to the OS kernel?
   2. How does the kernel turn control over to the system services?
   3. How does the system turn control over to the user and clients?
2. Understanding the Master Boot Record
3. Steps of the boot process:
   • Boot loaders: stage1, stage2 (DOS, SYSLINUX, LILO, GRUB)
   • Kernel: initialization, process creation, mounting /
   • System initialization: checking and mounting file systems, initializing swap space, ...
   • System services: runlevels and startup scripts, (rc0.d, rc1.d, rc2.d, ... rc6.d
4. Boot a unix system into single user (maintenance) mode.
5. Select and configure the runlevels: chkconfig, service, and /etc/inittab

Assignment

1. Read Chapter 6 with emphasis on the first 5 sections - through file attributes.
2. Do Lab 2
3. Extra Credit

Resources

• PowerPoint Slides
• Lecture Archive