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Define and Switch Runlevels

A collection of services that define a specific system state Runlevel
Runlevel: Single user mode - user automatically logged in as root (no GUI) - often for maintenance 1
Multi-user mode - allows multiple user logins -networking services except Network Files Systems (no GUI) 2
Extended multi-User mode -Multi- user suppot and offers all network services (No GUI) 3
Halt state -systems has no daemons in memory and is ready to be turned off 0
Runlevel is undefined, but can be customized 4
Graphical mode (GUI) -provides same capabilities as in 'extended mode' but supports graphical logins 5
Reboot - system restarts itself 6
init process uses the ----- file to determine the DEFAULT runlevel /etc/inittab
Format of the /etc/inittab file: Label:Runlevel(s):Actions:Command
/etc/inittab Fields: Organizes the file to allow the init daemon to read it alphabetically label
/etc/inittab Fields: Specifies the runlevel(s) to which the line corresponds runlevel(s)
/etc/inittab Fields: Tells init what action to take (e.g. respawn, wait, boot, bootwait, powerfail, and powerwait action
/etc/inittab Fields: designates a shell command to execute command
/etc/inittab Example: Runs the special script (/sbin/custom) for runlevels 1,2,3 cmd:123:wait:/sbin/custom
Display the previous and current runlevel runlevel
Runlevel command o/p = 3 5 The first number is the PREVIOUS runlevel The second number is the CURRENT runlevel
Change the runlevel of the computer init {runlevel) - init 3 = change to runlevel 3 telinit {runlevel} - telinit 5 = change to runlevel 5
Have init re-examine the inittab file init q init Q
Line in /etc/inittab file that defines the DEFAULT runlevel (e.g. runlevel 3) id:3:initdefault:
Created by: johnadream