Detailed SoL 25 Boot

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Following is a detailed description of the SoL 25 boot process, mainly which scripts are called in which runlevel, in which order and what they do, on a fresh SoL 25 installation, where init boots into runlevel 4.

All runlevel scripts are located in /etc/rc.d/bin, the configuration files that are used by some of these scripts are located in /etc/rc.d/cfg (read Basic System Configuration for more information).

Contents

[edit] Pre-init

  1. Power-on
  2. BIOS POST
  3. GRUB
  4. Linux Kernel

[edit] init

The first thing init does is the system initialization (bootwait action) by calling runsol 9 ("runlevel 9"). By default, in this runlevel the only script that is called, is /etc/rc.d/bin/init-system.sh, which basically does the following:

  • Mount the special filesystems for /proc, /sys, /dev/pts, /dev/shm, /proc/bus/usb
  • Mount /dev (as tmpfs) and start udev
  • Start loopback network
  • Start non-spamming syslogd & klogd
  • Basic hardware detection via PCI IDs
  • Boot parameter magic
  • If appropriate (Split Mode or Diskless Mode), mount /etc and /var
  • Activate swap
  • Set clock
  • Remove lock files
  • Setting default host- and domainname ("SoLxxxxxxxxxxxx.tld" where "xxxxxxxxxxxx" will be the MAC address of your eth0 networkdevice or empty if you don't have one)
  • Stop syslogd (it will be restarted in the next runlevel)
  • Clean up /etc/mtab

[edit] Runlevel 1 - Single User Mode

This is called directly after the system initialization, the scripts called here are:

  • sol-hostname.sh - Sets the host- and domainname specified in hostname.cfg
  • sol-syslogd.sh - Starts syslogd with the "real" configuration
  • sol-kb.sh - Sets the keyboard layout specified in kb.cfg

[edit] Runlevel 2 - Basic System without Network

  • sol-modules.sh - Explicitly loads modules that are specified in modules.cfg

[edit] Runlevel 3 - Basic System with Network

  • sol-if.sh - Assigns IP addresses to the network interfaces like specified in if.cfg
  • sol-route.sh - Sets up the route like specified route.cfg
  • sol-ssh.sh - Starts up the SSH daemon

[edit] Runlevel 4 - Services Layer

This runlevel is empty in a default installation. Normally, you would want to add your desired services here, Runlevel System describes how to do this.

At this point, the system is up and ready for action.

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