Red Hat DIRECTORY SERVER 2.0 - GATEWAY Manual de usuario descargar pdf (Pagina 15)

Chapter 2. The site’s design

This chapter will describe the design of a web site that we will set as our goal for this

course and discuss a small amount of theory.

Site description:

We will describe the web site that we want to create. This will be a website with a

number of modern features. In particular we will demand the facility to run multiple

virtual hosts (that is, different websites running off the same server).

Virtual hosting:

There will be a brief diversion while we describe exactly how virtual hosting is pos-

sible. There are a variety of different ways to achieve this goal and we will describe

the two most common.

The server we want

We are going to describe the server in the terms that an academic would use to de-

scribe it to a computer ofﬁcer in the University: annoyingly vague. This is an excuse

for this course to introduce new features one at a time, of course.

Sites:

We are told that the server must serve two web sites, chalk.dept.cam.ac.uk and

cheese.dept.cam.ac.uk whose web pages will be under the control of two different

groups of users.

Facilities:

The “usual facilities” should be provided. This is too vague a speciﬁcation in reality,

but it is typically all the average academic or manager will ever ask for. In this course

we will assume that this means index pages, automatic directory listing, user home

pages and access controls. To illustrate how to create tied-down servers we will also

design the server to be this and no more.

Logging:

Logs should be kept for as long as possible and usage information should be avail-

able on the web. We will have to consider the DPA implications of this part of the

speciﬁcation, of course.

What is a virtual host?

There are (at least) three different ways that a single web server can host more than

one web site.

Multiple ports:

A web server can listen on more than the default port (number 80) and offer different

web sites on each port. To identify a non-standard port, its number must follow the

server name in the URL: http://www.dept.cam.ac.uk:port/some/path/here/. The

receiving system uses the port number of the incoming query to distinguish between

web sites.

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Red Hat DIRECTORY SERVER 2.0 - GATEWAY Manual de usuario Pagina 15