Red Hat DIRECTORY SERVER 2.0 - GATEWAY Manual de usuario descargar pdf (Pagina 9)

Chapter 1. Installing the software

Changes made to the system

We should quickly examine what changes have been made to the system by the in-

stallation of these packages. The httpd package has obviously installed a web server

(in /usr/sbin/httpd) but it has also installed ﬁles in a few other locations.

conf

conf.d

logs

modules

run

magic

README

/var/logs/httpd

/usr/lib/httpd/modules

/var/run

httpd.conf

mod_*.so

*.pid

empty/etc/httpd

Figure 1-8. Conﬁguration hierarchy

The /etc/httpd directory contains all the conﬁguration for the web server and is

where the server looks for everything except the web pages themselves. The conf

subdirectory is for the main conﬁguration ﬁle, httpd.conf. The conf.d directory is

for extra elements of conﬁguration which can be automatically included in the server

conﬁguration.

Because this directory is where the server looks for most things there are some sym-

bolic links leaving this directory and pointing to where the system expects such things

to go.

The logs symbolic link points into the /var/logs directory where Red Hat Linux

stores its logs. An httpd subdirectory is used because there will typically be more

than one log ﬁle in use at any time. This subdirectory holds them together. We will

discuss log ﬁles in detail in Chapter 7.

The modules symbolic link points into /usr/lib where Red Hat Linux keeps its li-

braries. Again, an httpd subdirectory is used to keep all the Apache libraries to-

gether. The libraries are called “modules” under Apache and much of the course will

be devoted to what they can do and how to get them to do it.

The run symbolic link points to /var/run. This directory on a Red Hat Linux system

is used by long-running processes to declare that they are running and to indicate

how to contact them. In practice this means that it is full of PID ﬁles. These are ﬁles,

named after the process they refer to, containing the process ID (PID) of the process.

For Apache, the PID ﬁle is called httpd.pid. In practice, we will not need to know

about this ﬁle except to understand how the Apache shutdown procedure works in

Chapter 3.

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