This document provides an overview of the Apache HTTP Server, including what it is, its main features, how it works, and how to install it. It begins by explaining that Apache is a free and open-source web server software that can run on many operating systems. It then lists and briefly describes Apache's features, such as supporting multiple programming languages, virtual hosting, and log formats. The document also summarizes how Apache uses multi-processing modules to handle requests and describes its default prefork and worker modules. It concludes by covering Apache's virtual hosting, log formats, error handling, and installation process.

2. Agenda
❖ What is a Web-server?
❖ Apache HTTP Server Overview
❖ Apache Features
❖ How Apache works
❖ Virtual Host
❖ Log Format
❖ Error Handling
❖ Installation of Apache

3. What is a web-server?
A Web server is a program that uses HTTP (Hypertext Transfer Protocol) to serve the files that form Web pages to users, in
response to their requests, which are forwarded by their computers' HTTP clients.
Internet

4. Apache HTTP server Overview
● Free, Based on Open source Technology
● Multiple Scripting language Support
● Simple, Powerful file-based configuration
● Runs on almost all Operating System

5. Origin of Apache
Apache is a remarkable piece of application software. It is the most widely used Web Server application in the world with
more than 50% share in the commercial web server market. Apache is the most widely used Web Server application in
Unix-like operating systems but can be used on almost all platforms such as Windows, OS X, OS/2, etc.

6. Apache Features
● It is a modular, process-based web server application that creates a new
thread with each simultaneous connection.
● It supports a number of features; many of them are compiled as separate
modules and extend its core functionality, and can provide everything from
server side programming language support to authentication mechanism.
● Virtual hosting is one such feature that allows a single Apache Web Server to
serve a number of different websites.

7. How Apache Works
Apache introduced Multi-Processing Modules, or MPMs. The MPMs change the basic functionality of the
web server. They do this by modifying how Apache listens to the network, accepts, and handles
requests.
1. Prefork
1. Worker
1. Event

8. Prefork
By default mpm is prefork which is thread safe.
Prefork MPM uses multiple child processes with one thread each and each process handles
one connection at a time.

9. Worker
Worker MPM uses multiple child processes with many threads each. Each thread handles
one connection at a time.

10. Virtual Host
An Apache web server can host multiple websites on the SAME server. You do not need separate server machine and
apache software for each website. This can achieved using the concept of Virtual Host or VHost.
Types:
1. Name-based Virtual host
2. Address-based or IP based virtual host

11. IP Based Name Based

12. Apache Log Format
● Common Log Format
LogFormat "%h %l %u %t "%r" %>s %b" common
● CustomLog log Format
LogFormat "%h %l %u %t "%r" %>s %b "%{Referer}i" "%{User-agent}i""
combined

13. Error Handling
301 - Moved Permanently
401 - Unauthorized
403 - Forbidden
404 - Not Found
500 - Internal Server Error

14. Installation of Apache
yum update
yum install httpd* -y
systemctl enable httpd.service
systemctl start httpd.service

15. Apache Default page
Check in your browser
by hitting localhost or
public ip of server to
get the apache test
page.

16. THANK YOU