Install Apache

RHEL/Centos:

sudo yum install httpd

Ubuntu/Debian:

sudo apt install apache2

Configuration/folder structure

RHEL/Centos:

• Main configuration folder: /etc/httpd/
• Main configuration file: /etc/httpd/conf/httpd.conf

• Folder for module configuration files: /etc/httpd/conf.d/

  (all *.conf files in this folder will be loaded)

Ubuntu/Debian:

• Main configuration folder: /etc/apache2/
• Main configuration file: /etc/apache2/apache2.conf
• Configuration file for listening ports: /etc/apache2/ports.conf

• Folder for module configuration files: /etc/apache2/mods-enabled/

  (all _.conf and _.load files in this folder will be loaded)

• Folder for sites/virtual hosts configuration files : /etc/apache2/sites-enabled/

  (all *.conf files in this folder will be loaded)

• Folder for global configuration fragments : /etc/apache2/conf-enabled/

  (all *.conf files in this folder will be loaded)

Enable a module:

RHEL/Centos:

1. Search for the module to install (most modules begin with mod_):

   sudo yum search mod_ssl
   

   Or search all available modules:

   sudo yum search mod_
   

2. Install the module

   sudo yum install mod_ssl
   

   This will automatically create a file in /etc/httpd/conf.d/ that will load the module so it can be used.

Ubuntu/Debian:

1. Search for the module to install (most modules begin with libapache2-mod-):

   apt-cache search libapache2-mod-php5
   

   Or search all available modules:

   apt-cache search libapache2-mod
   

2. Install the module

   sudo apt install libapache2-mod-php5
   

3. Enable the module

   sudo a2enmod php5
   

In Ubuntu/Debian, SSL is installed by default, it just needs to be enabled:

sudo a2enmod ssl

Enable a site (Ubuntu/Debian):

1. Back up the original configuration

   sudo cp /etc/apache2/sites-available/default-ssl /etc/apache2/sites-available/default-ssl.bak
   

2. Modify it as needed

   sudo vim /etc/apache2/sites-available/default-ssl
   

3. Enable the site

   sudo a2ensite default-ssl