🖥️ Apache HTTP Server (httpd) Documentation

🌟 Overview

Apache HTTP Server, commonly referred to as Apache or httpd, is an open-source web server software that is highly customizable and widely used. It can serve static content, dynamic web pages, and integrate with various modules to extend its capabilities.

📦 Installation

Ubuntu/Debian

Update the package list:
```
sudo apt update
```
Install Apache:
```
sudo apt install apache2 -y
```

Start and enable Apache service:

sudo systemctl start apache2
sudo systemctl enable apache2

CentOS/RHEL

Update the package list:
```
sudo yum update -y
```
Install Apache:
```
sudo yum install httpd -y
```

Start and enable Apache service:

sudo systemctl start httpd
sudo systemctl enable httpd

🔧 Basic Configuration

Main Configuration File

Location: /etc/apache2/apache2.conf (Ubuntu/Debian), /etc/httpd/conf/httpd.conf (CentOS/RHEL)

Virtual Hosts

Virtual hosts allow you to run multiple websites on a single server.

Sample Configuration

Create a configuration file:

Ubuntu/Debian:

sudo nano /etc/apache2/sites-available/example.com.conf

CentOS/RHEL:

sudo nano /etc/httpd/conf.d/example.com.conf

Add the following content:

<VirtualHost *:80>
    ServerAdmin [email protected]
    ServerName example.com
    ServerAlias www.example.com
    DocumentRoot /var/www/example.com
    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

Enable the virtual host configuration:

Ubuntu/Debian:

sudo a2ensite example.com.conf
sudo systemctl reload apache2

CentOS/RHEL:
```
sudo systemctl restart httpd
```

Create the Document Root:

sudo mkdir -p /var/www/example.com
sudo chown -R $USER:$USER /var/www/example.com

Add a sample index file:

echo "<html><body><h1>Welcome to example.com!</h1></body></html>" | sudo tee /var/www/example.com/index.html

🛠️ Common Commands

Managing Apache Service

Start Apache:

sudo systemctl start apache2   # Ubuntu/Debian
sudo systemctl start httpd     # CentOS/RHEL

Stop Apache:

sudo systemctl stop apache2   # Ubuntu/Debian
sudo systemctl stop httpd     # CentOS/RHEL

Restart Apache:

sudo systemctl restart apache2   # Ubuntu/Debian
sudo systemctl restart httpd     # CentOS/RHEL

Reload Apache (for configuration changes):

sudo systemctl reload apache2   # Ubuntu/Debian
sudo systemctl reload httpd     # CentOS/RHEL

Check Apache status:

sudo systemctl status apache2   # Ubuntu/Debian
sudo systemctl status httpd     # CentOS/RHEL

Enable/Disable Modules (Ubuntu/Debian)

Enable a module:

sudo a2enmod module_name
sudo systemctl restart apache2

Disable a module:

sudo a2dismod module_name
sudo systemctl restart apache2

Logs

Access log: /var/log/apache2/access.log (Ubuntu/Debian), /var/log/httpd/access_log (CentOS/RHEL)
Error log: /var/log/apache2/error.log (Ubuntu/Debian), /var/log/httpd/error_log (CentOS/RHEL)

🔍 Additional Configuration

Enabling SSL (HTTPS)

Install OpenSSL:

Ubuntu/Debian:
```
sudo apt install openssl
```
CentOS/RHEL:
```
sudo yum install mod_ssl
```

Generate a self-signed certificate:

sudo openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout /etc/ssl/private/apache-selfsigned.key -out /etc/ssl/certs/apache-selfsigned.crt

Configure SSL in the virtual host file:

<VirtualHost *:443>
    ServerAdmin [email protected]
    ServerName example.com
    ServerAlias www.example.com
    DocumentRoot /var/www/example.com
    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined
 
    SSLEngine on
    SSLCertificateFile /etc/ssl/certs/apache-selfsigned.crt
    SSLCertificateKeyFile /etc/ssl/private/apache-selfsigned.key
 
    <FilesMatch "\.(cgi|shtml|phtml|php)$">
        SSLOptions +StdEnvVars
    </FilesMatch>
    <Directory /usr/lib/cgi-bin>
        SSLOptions +StdEnvVars
    </Directory>
</VirtualHost>

Enable SSL module and site:

Ubuntu/Debian:

sudo a2enmod ssl
sudo a2ensite default-ssl
sudo systemctl reload apache2

CentOS/RHEL:
```
sudo systemctl restart httpd
```

🏁 Conclusion

Apache HTTP Server is a versatile and powerful tool for serving web content. By following this guide, you can set up and configure Apache on your system, create virtual hosts, and enable SSL for secure communication. Use the commands provided to manage your Apache server effectively.

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