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