Slide 4.3 SysVinit Runlevels

Elyas

On said slide runlevels are introduced according to SysVinit which apparently is still used even if only under the hood.

I use Ubuntu 14.04 up to date.

I tried the suggested command

sudo telinit 5

and nothing happens. It seems that runlevels 2 - 5 do not correspond to the descriptions of the slide (when you click the Info button). My questions are:

1. Where can I find descriptions of Ubuntu's runlevels.

2. If Upstart does not use runlevels so why do they still exist? What is their effect?

luisviveropena

Hi,

1. http://upstart.ubuntu.com/cookbook/#runlevels

4.7 Runlevels

A runlevel is a single-byte name for a particular system configuration. Runlevels for Debian and Ubuntu systems are generally as follows [34]:

0 : System halt.
1 : Single-User mode.
2 : Graphical multi-user plus networking (DEFAULT)
3 : Same as "2", but not used.
4 : Same as "2", but not used.
5 : Same as "2", but not used.
6 : System reboot.

So, that would explain why it's not doing something different when moving to that runlevel

2. Well, Upstart it's more complex than System V, but it uses the same concept of runlevels:

http://upstart.ubuntu.com/cookbook/#system-phases

Regards,
Luis.