Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Scaricare il pdf (Pagina 72)

72 Chapter 3. Boot Process, Init, and Shutdown

• ups-trust425+625 — For a Trust™ UPS.

• DEVICE= value , where value speciﬁes where the UPS is connected, such as /dev/ttyS0.

• OPTIONS= value , where value is a special command that needs to be passed to the UPS.

3.3.1.35. /etc/sysconfig/vncservers

The /etc/sysconfig/vncservers ﬁle conﬁgures how the Virtual Network Computing (VNC)

server starts up. VNC is a remote display system which allows you to view a desktop environment not

only on the machine where it is running but across different networks (from a LAN to the Internet)

and using a wide variety of machine architectures.

It may contain the following:

• VNCSERVERS= value , where value is set to something like "1:fred", to indicate that a

VNC server should be started for user fred on display :1. User fred must have set a VNC password

using vncpasswd before attempting to connect to the remote VNC server.

Note that when you use a VNC server, your communication with it is unencrypted, and

so it should not be used on an untrusted network. For speciﬁc instructions concerning

the use of SSH to secure the VNC communication, please read the information found at

http://www.uk.research.att.com/vnc/sshvnc.html. To ﬁnd out more about SSH, see Chapter 10 or

Ofﬁcial Red Hat Linux Customization Guide.

3.3.1.36. /etc/sysconfig/xinetd

The /etc/sysconfig/xinetd ﬁle is used to pass arguments to the xinetd daemon at boot time.

The xinetd daemon starts programs that provide Internet services when a request to the port for that

service is received. For more information about what parameters you can use in this ﬁle, type man

xinetd. For more information on the xinetd service, see Section 9.3.

3.3.2. Directories in the /etc/sysconfig/ Directory

The following directories are normally found in /etc/sysconfig/ and a basic description of what

they contain:

• apm-scripts — This contains the Red Hat APM suspend/resume script. You should not edit

this ﬁle directly. If you need customization, simple create a ﬁle called /etc/sysconfig/apm-

scripts/apmcontinue and it will be called at the end of the script. Also, you can control the

script by editing /etc/sysconfig/apmd.

• cbq — This directory contains the conﬁguration ﬁles needed to do Class Based Queuing for band-

width management on network interfaces.

• networking — This directory is used by Red Hat Network Administration Tool and should not

be edited manually. For more information about conﬁguring interfaces using the Red Hat Network

Administration Tool, see the chapter called Network Conﬁguration in the Ofﬁcial Red Hat Linux

Customization Guide.

• network-scripts — This directory contains the following network-related conﬁguration ﬁles:

• Network conﬁguration ﬁles for each conﬁgured network interface, such as ifcfg-eth0 for the

eth0 Ethernet interface.

• Scripts used to bring up and down network interfaces, such as ifup and ifdown.

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Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Pagina 72