Red Hat DIRECTORY SERVER 2.0 - GATEWAY Manuel d'utilisateur télécharger pdf (Page 22)

Chapter 3. Getting started

reason the parent decides whether or not to replace it. (If they have all been idle for

the past 48 hours it may decide that four processes are plenty.) If they are all kept too

busy the parent may choose to start up some more processes to share the load. The

set of child processes is called the server pool and is the traditional mechanism that

Apache has always used to provide rapid responses. This way of working is called

the pre-forked model.

There are other models other than pre-forked, but Red Hat Linux has this enabled by

default and it is what we will use throughout the course.

Figure 3-10. No documents!

At the moment, the server has nothing to serve. Every attempt to request a

page from it results in a 404, not found error. If we look in the error log ﬁle,

/var/log/httpd/error_log we will see the error message:

[Tue Mar 18 13:42:10 2003] [error] File does not exist: /etc/httpd/htdocs

which indicates that the server is looking in the wrong place!.

We need to tell it where to look. However, as we are planning on hosting two web

sites we ought to be thinking about two locations, one for each value of the Host:

header. We should also think about what to do with requests that have neither

chalk.dept.cam.ac.uk nor cheese.dept.cam.ac.uk as the Host: header’s value.

Use valid DNS names

The names used for the virtual hosts cannot just be made up. They

must be registered in the DNS for the IP address of the server being

used. Typically there will be a “real” name for the server (given by the

DNS A record) and a number of aliases for the web sites (given by DNS

CNAME records).

We shall create two subdirectories, CHALK and CHEESE, of /var/www for the two web-

sites. We will also create two groups, chalk and cheese, which will contain the people

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Red Hat DIRECTORY SERVER 2.0 - GATEWAY Manuel d'utilisateur Page 22