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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.

3.3. Special File Locations Under Red Hat Enterprise Linux

Red Hat Enterprise Linux extends the FHS structure slightly to accommodate special files.

Most files pertaining to RPM are kept in the /var/lib/rpm/ directory. For more information on RPM, refer to the chapter titled Package Management with RPM in the Red Hat Enterprise Linux System Administration Guide.

The /var/spool/up2date/ directory contains files used by Red Hat Update Agent, including RPM header information for the system. This location may also be used to temporarily store RPMs downloaded while updating the system. For more information about Red Hat Network, refer to the documentation online at https://rhn.redhat.com/.

Another location specific to Red Hat Enterprise Linux is the /etc/sysconfig/ directory. This directory stores a variety of configuration information. Many scripts that run at boot time use the files in this directory. Refer to Chapter 4 The sysconfig Directory for more information about what is within this directory and the role these files play in the boot process.

Finally, one more directory worth noting is the /initrd/ directory. It is empty, but is used as a critical mount point during the boot process.

Warning Warning
 

Do not remove the /initrd/ directory for any reason. Removing this directory causes the system to fail to boot with a kernel panic error message.

 
 
  Published under the terms of the GNU General Public License Design by Interspire