NOTE: CentOS Enterprise Linux is built from the Red Hat Enterprise Linux source code. Other than logo and name changes CentOS Enterprise Linux is compatible with the equivalent Red Hat version. This document applies equally to both Red Hat and CentOS Enterprise Linux.
The following directories are normally found in /etc/sysconfig/.
apm-scripts/ — This directory
contains the APM suspend/resume script. Do not edit the files
directly. If customization is necessary, create a file called
which is called at the end of the script. It is also possible to
control the script by editing /etc/sysconfig/apmd.
cbq/ — This directory contains
the configuration files needed to do Class
Based Queuing for bandwidth management on network interfaces.
CBQ divides user traffic into a hierarchy of classes based on any
combination of IP addresses, protocols, and application types.
networking/ — This directory is
used by the Network Administration Tool
(system-config-network), and its contents
should not be edited manually. For more information about
configuring network interfaces using the Network Administration Tool, refer to the chapter
called Network Configuration in the
Red Hat Enterprise Linux System Administration
network-scripts/ — This
directory contains the following network-related configuration
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.
Scripts used to bring up and down ISDN interfaces, such as
ifup-isdn and ifdown-isdn.
Various shared network function scripts which should not be
For more information on the network-scripts directory, refer to Chapter 8 Network
rhn/ — This directory contains
the configuration files and GPG keys for Red Hat Network. No files
in this directory should be edited by hand. For more information on
Red Hat Network, refer to the Red Hat Network website online at