Redhat Linux Boot Process

• The system BIOS checks the system and launches the first stage boot loader on the MBR of the primary hard disk.
• The first stage boot loader loads itself into memory and launches the second stage boot loader from the "/boot" partition.
• The boot loader then place one or more appropriate "initramfs".
• Once the kernel and the intiramfs image(s) are loaded into memory, the boot loader hands control of the boot process to the kernel.
• Then kernel hands off the boot process to the "init" then "/sbin/init" program, and it coordinates the rest of the boot process and configures the environment for the user.
• init > calls >/etc/rc.d/rc.sysinit
• init > calls > /etc/inittab > runlevel
• /etc/rc.d/rc<x>.d (As for the runlevel)
• K (first) and then S, scripts.
• K and S scripts, porints /etc/rc.d/init.d/..
• init > calls > /etc/rc.d/rc.local
• if runlevel 5 > /sbin/mingetty
• /etc/inittab > /etc/X11/prefdm
• login prompt.