Nginx HTTP Server - Fourth Edition

System V scripts

Most Linux-based operating systems to date use a System-V style init daemon. In other words, their start up process is managed by a daemon called init, which functions in a way that is inherited from the old System V Unix-based operating system.

This daemon functions on the principle of runlevels, which represent the state of the computer. Here is a table representing the various runlevels and their signification:

Runlevel	State
0	System is halted
1	Single-user mode (rescue mode)
2	Multiuser mode, without NFS support
3	Full multiuser mode
4	Not used
5	Graphical interface mode
6	System reboot

 

You can manually initiate a runlevel transition: use the telinit 0 command to ...