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sysvinit Cheat Sheet

A cheat sheet in English by misterrabinhalder
Init
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Config­uration

Config­uration File
/etc/i­nittab
Config­uration Syntax
id:2:i­nit­def­ault:
id - A unique indent­ifier
2 - The applicable runlevel number
initde­fault - The action that init should take
(optional) A command to execute
Config­uration Direct­ories
/etc/i­nit.d/
/etc/r­c$.d/

Starting and Stopping Services

To start and stop services by hand, use the script in the /etc/i­nit.d directory. For example, one way to start the httpd daemon manually is to run /etc/i­nit.d/­httpd start. Similarly, to kill a running service, you can use the stop argument. See, /etc/i­nit.d/­httpd for supported argument.

Inittab Actions

wait
Determine when and how System V init runs the command
respawn
Run the command that follows and, if the command finishes executing, to run it again
ctrlaltdel
Controls what the system does when you press CTRL + ALT + DEL
sysinit
Run this action except when in emergency mode
initde­fault
This is the default action

Runlevels

0
Halt
1
Single­-user text mode
2
Not used (user-­def­inable)
3
Full multi-user text mode
4
Not used (user-­def­inable)
5
Full multi-user graphical mode (with an X-based login screen)
6
Reboot

Link Farm

The contents of the rc*.d direct­ories are actually symbolic links to files in yet another directory, init.d. A large number of symbolic links across several subdir­ect­ories such as this is called a link farm.

Contro­lling System V init

telinit 3
Switch to runlevel 3
telinit q
Reload inittab file
telinit s
Switch to single­-user mode

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