RHCE RHCT EXAM: How to reboot Redhat linux

How to reboot or Shutdown Redhat linux :

REBOOT REDHAT LINUX :

#shutdown -r now

OR

# reboot

OR init 6

OR CTRL+ALT+DEL

RHCE RHCT Linux Certification Exam : GRUB Boot loader

Configuring the GRUB Boot Loader for RHCE/RHCT :

To configure the boot loader or edit anything for GRUB configuration file is:

• /boot/grub/grub.conf
• In case MBR is corrupted try
  
• /sbin/grub-install /dev/hda
  

where hda is first installed PCI hard drive on your RHEL 4 server.




#NOTICE: You have a /boot partition. This means that
# all kernel paths are relative to /boot/
default=0
timeout=30
splashimage=(hd0,0)/grub/splash.xpm.gz

title Red Hat Linux (2.4.18-0.12)
root (hd0,0)
kernel /vmlinuz-2.4.18-0.12 ro root=/dev/hda3
initrd /initrd-2.4.18-0.12.img

RHCE RHCT Linux Certification Exam Guide :LINUX BIOS

LINUX BIOS :

When a microprocessor powers up, it starts executing instructions located in a ROM chip. These initial instructions are responsible for initializing the hardware (especially enabling RAM) and loading an operating system. The implementations and interfaces to this functionality vary from machine to machine, but its basic responsibility remains the same.

Here is an excelllent Resource on LINUX BIOS initialization ....

RHCE RHCT Linux Certification Exam: RHEL Boot sequence

Redhat Enterprise Linux 4 Boot Sequence :

For RHCE and RHCT exam you should know RHEL4 boot sequence as follows:

• Bios Initialization
• Loading Boot Loader phase
• Kernel initialization
• init startup which is first process to run in Linux during startup
• Launching X or GUI if enabled