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Lesson 4 The GNOME Display Manager
Objective Use the GNOME Display Manager to manage X Sessions.

GNOME Display Manager to manage X Sessions

A display manager presents users with a login session that is graphical from start to finish. It is an X application, and it uses the X server to create the familiar Red Hat graphical login screen. Click on the thumbnail of the image to see the full screen.
The GUI environment
The display manager allows users to type their username and password, and then logs users into their X windows session.

Starting the GNOME Display Manager
The GNOME Display Manager (gdm) process starts automatically when the system enters the graphical environment run-level. When you log in, gdm stays active to handle the possibility of further login requests.

Configuring the GNOME Display Manager
gdm is highly configurable, and the gdm configuration file, /etc/X11/gdm/gdm.conf, stores many of the configurable options.
Sections divide this file into logical units, and each section configures a single piece of gdm's behavior. For example, the section labeled [greeter] configures the login window displayed when gdm waits for a user to log in. In this section, you can configure the greeting message, select an option to have the screen "quiver" when authentication fails, display a user browser, and many more features.
The following simulation allows you to practice setting several options in the /etc/X11/gdm/gdm.conf file and to see the results.
Gnome Configuration Options
The next lesson explains the need for a window manager to get the most out of X.

Gnome Display Quiz
Before moving on to the next lesson, click the Quiz link below to check your understanding of the Gnome Display Manager.
Gnome Display Quiz