Debian RunLevel enters the character interface by default

This article briefly introduces the concept of Debian RunLevel, describes the changes to the RunLevel runtime, so that RunLevel 3 does not enter the graphical interface by default, but enters the character interface. Set RunLevel 3 as the default startup after modifying RunLevel.

1.runlevel Introduction

Debian consists of 0-6 runlevel:

0:halt; IE shutdown

1: Single-user mode

2-5: Multi-user mode

6: restart

Note: Redhat is started by default at runlevel 5 (server default 3), Debian/ubuntu starts with RunLevel 2 by default. The runlevel3-5 here are all entered into the graphical interface. This is not consistent with other Linux distributions, typically RunLevel 3 is multi user mode, which is directly logged into the character interface, while RunLevel 5 is the multi user mode with GUI, which is the login to the graphical interface.

To view the currently used RunLevel, you can use the command

# RunLevel

You can view the system default runlevel in the/etc/inittab file:

#The Default RunLevel

Id:2:initdefault:

2. Modify RunLevel 3

in the /etc/rc3.d in You can view multiple K and the S the beginning of the file, they are some symbolic links (equivalent to shortcuts) when the system starts RunLevel , it will start automatically. S start file (similar to boot). Set RunLevel 3 to automatically enter the character interface step as follows:

• Enter/ETC/RC3.D

• Locate the S**GDM3 entry and modify it to K**GDM3

  # MV S**GDM3 K**GDM3

• Run the following command to have the system re-order the startup scripts based on dependencies

  # UPDATE-RC.D GDM3 Defaults

3. Modify the system default run level

Open a/etc/inittab file and find "#The default RunLevel":

#The default RunLevel

Id:2:initdefault:

Revision changed to

Id:3:initdefault:

4. Rebooting the system

# reboot

Debian RunLevel enters the character interface by default