Stages of Boot process
| System Startup | Bios |
| Stage1 Bootloader | MBR |
| Stage2 Bootloader | GRUB |
| Kernel & initrd | Linux |
| init | User-space |
- BIOS Initialization
- Boot Loader resides in MBR, load from boot partition
- Kernel Initialization Device detection, device driver initialization, Mount root filesystem read only, Loads initial process (init)
- /etc/rc.d/rc.sysinit - Ask I for interactive mode (activate selinux, set clock, enable swap, set hostname, root filesystem check, activate RAID, LVM, disk quota)
- /etc/rc.d/rc initialize default run level as per inittab file entry
- start rcX.d as per run level
- /etc/rc.d/init.d contains all service files
- /etc/rc.d/rc.local run after run level specific sctipts, common place for custom modification. Run each time system enters a run level
If root filesystem is mounted as read only in single user mode, to remount in rw
# mount –o rw,remount /
# mount –o remount –w /
File system check without prompting
# fsck –y
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