Boot Process in Debian / Ubuntu

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Boot up phases

There are 4 phases to starting up the system:

  1. BIOS
  2. Boot loader
  3. Kernel
  4. Upstart (which manages system tasks and services )

Kernel modules are loaded during the Kernel phase. The kernel uses a file system which is present in memory, called an 'initrd' for 'initial ram disk'. The kernel launches the init script inside the initrd file system, which loads hardware drivers and finds the root partition.

Upstart is the initialization scripts that run. These scripts involve different /etc/rc scripts and upstart events.

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