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AIX Version 4.3 System Management Guide: Operating System and Devices
Adding and Removing Displays and Terminals
for AIX Common Desktop Environment
The login manager may be started from a
system with a single local bitmap or graphics console. Many other
situations are also possible, however (see figure). You may want to start AIX Common Desktop Environment from:
- Local consoles.
- Remote consoles.
- Bitmap and character-display.
- X Display Manager Control Protocol (XDMCP)
Xstations.
- Non-XDMCP Xstations.
- Xterminal systems running on a host system
on the network.
An Xterminal system consists of a display
device, keyboard, and mouse that runs only the X server. Clients,
including AIX Common Desktop Environment, are run on one or more host systems on the
networks. Output from the clients is directed to the Xterminal display.
Wherever possible, you should use
terminals that support XDMCP (X Display Manager Control Protocol).
The following Login Manager configuration
tasks support many possible configurations.
Adding an Xstation Terminal that supports
XDMCP
- Make sure Login Manager is running on the
host system.
- Enable XDMCP on the Xterminal and direct
it to contact Login Manager on the host system.
XDMCP provides a mechanism by which
Xterminals can request login services from a network host. It ensures that
the Xterminal is communicating with a valid login manager, and provides the
protocol for exchanging authentication information between the Xterminal
and the host login manager. Documentation for your Xterminal covers the
procedure for enabling XDMCP.
Limiting Access by Xterminals to a Host
- If the /etc/dt/config/Xaccess file
does not exist, copy the /usr/dt/config/Xaccess file to the
/etc/dt/config directory.
- If you have to copy Xaccess to
/etc/dt/config, you must change the Dtlogin.servers: line in
/etc/dt/config/Xconfig to:
Dtlogin.accessFile:
/etc/dt/config/Xaccess
- Edit /etc/dt/config/Xaccess on the
host. List only those X-terminals permitted to access Login Manager.
If Xaccess is empty, any host can connect.
Using a Workstation as an Xterminal
From a command line, enter:
/usr/bin/X11/X -query hostname
The X server of the workstation acting as
an Xterminal must:
- Support XDMCP and the -query
command-line option.
- Provide xhost permission
(in /etc/X*.hosts) to the terminal host.
Adding a Non-XDMCP Xstation Terminal
- If the /etc/dt/config/Xservers file
does not exist, copy the /usr/dt/config/Xservers file to the
/etc/dt/config directory.
- If you have to copy Xservers to
/etc/dt/config, you must change the Dtlogin.servers: line in
/etc/dt/config/Xconfig to:
Dtlogin*servers: /etc/dt/config/Xservers
- Edit /etc/dt/config/Xservers to
include an entry for each terminal. The display type of each terminal must
be foreign.
- Reread the Login Manager configuration
files.
When Login Manager receives a SIGHUP, it
rereads Xconfig and the Xservers file (or the file specified by the
Dtlogin.servers resource). If it finds a new entry, dtlogin starts
managing that display. If an entry has been removed, the process associated
with that entry is immediately terminated.
Example
The following lines in Xservers directs
dtlogin to manage sessions on two non-XDMCP terminals.
ext1:0 NPD200X foreign
ext2:0 QCP-19 foreign
Removing a Local Display
To remove a local display, remove its
entry in the Xservers file in the /usr/dt/config directory.
Adding an ASCII or Character-Display
Terminal
A character-display console is a
configuration in which the console is not a bitmap device.
Adding an ASCII or Character-Display
Console If No Bitmap Display Is Present
- If the /etc/dt/config/Xservers
file does not exist, copy the /usr/dt/config/Xervers file to the
/etc/dt/config directory.
- If you have to copy Xservers to
/etc/dt/config, you must change the Dtlogin.servers: line in
/etc/dt/config/Xconfig to:
Dtlogin*servers: /etc/dt/config/Xservers
- Comment out the line in
/etc/dt/config/Xservers that starts the Xserver. This will disable
the Login Option Menu.
# * Local local@console /path/X :0
- Reread the Login Manager configuration
files.
Adding a Character-Display Console if a
Bitmap Display Exists
- If the /etc/dt/config/Xservers file
does not exist, copy the /usr/dt/config/Xservers file to the
/etc/dt/config directory.
- If you have to copy Xservers to
/etc/dt/config, you must change the Dtlogin.servers: line in
/etc/dt/config/Xconfig to:
Dtlogin*servers: /etc/dt/config/Xservers
- Edit the line in
/etc/dt/config/Xservers that starts the Xserver to read:
* Local local@none /path/X :0
- Reread the Login Manager configuration
files.
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