Cheatography
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Configuration
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Configuration File /etc/inittab
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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
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Configuration Directories /etc/init.d/
/etc/rc$.d/
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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. |
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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 |
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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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