Red Hat DIRECTORY SERVER 2.0 - GATEWAY Manuel d'utilisateur télécharger pdf (Page 11)

Chapter 1. Installing the software

• /usr/bin/ab: This a stress-tester for the web server. Please do not stress-test

people’s servers without their explicit permission. Otherwise you may ﬁnd them

stress-testing your skull with a pickaxe handle.

• /usr/bin/htdbm, /usr/bin/htdigest, /usr/bin/htpasswd: These manipulate

user and password information for web access controls. We will see htpasswd

later in the Section called Access control by client identity in Chapter 10 but we will

not be considering the other commands in this course.

• /usr/bin/logresolve: If a log ﬁle contains IP addresses rather than DNS names

for clients then this program will run through the log ﬁle and write out a copy with

hostnames replacing IP addresses. Because it caches resolved addresses it does this

rather efﬁciently. We will be covering log ﬁles (and why they might have IP ad-

dresses rather than hostnames) in Chapter 7.

System programs included with the web server

• /usr/sbin/apachectl: This is the script that is provided by the Apache team to

simplify turning on and off the service. However, to keep the startup and shut-

down of the server consistent with the rest of the system the standard startup

scripts don’t use this for the main work.

• /usr/sbin/httpd: This is the web server itself.

• /usr/sbin/rotatelogs: This is an Apache utility providing for rotating log ﬁles.

However, it is not used by a Red Hat Linux system because there is a system-

wide log rotation facility which is used instead for consistency with the rest of the

system. This will be considered in detail in the Section called Log rotation in Chapter

• /usr/sbin/suexec: This is a helper program for Apache that lets the server run

external programs (e.g. CGI programs) as a different user than the user running

the web service itself. As we will not be covering CGI programming in this course

we will not be making any use of this program. As it is a setuid root program, you

may want to remove it if you don’t need it.

Quick and Dirty Web Server

The majority of this course concerns the (re)conﬁguration of the web server. How-

ever, we should brieﬂy describe what a system administrator should do if he or she

is happy with the default (which is not a bad set of defaults, by the way).

If the system administrator is happy to do all the changes to the web site as root then

nothing more needs to be done other than turning on the web server.

To enable the web server (so that it gets started at system boot) the system adminis-

trator needs to use the chkconﬁg command.

# chkconfig --list httpd

httpd 0:off 1:off 2:off 3:off 4:off 5:off 6:off

# chkconfig httpd on

# chkconfig --list httpd

httpd 0:off 1:off 2:on 3:on 4:on 5:on 6:off

Figure 1-11. Enabling the web server

The next time the system is rebooted, the web server will be started. If you don’t

want to wait until a reboot, or don’t want to reboot, then it can be manually started

by running the script that would be run at boot time.

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