The web server is responsible for providing access to content via the HTTP protocol. Apache supports a variety of features, many implemented as compiled modules which extend the core functionality. These can range from server-side programming language support to authentication schemes. Some common language interfaces support Perl, Python, Tcl, and PHP.
You need to login as root user to install Apache 2 server.
Install Apache2 on Ubuntu
The Apache2 (HTTPD) web server is available in Ubuntu Linux. You can install Apache2 using apt-get command. Open a console (terminal) and type the following command to update existing packages:
sudo apt-get update
Next, type the following command to install Apache2 web server:
sudo apt-get install apache2
Apache 2 configuration files
- Default http port – 80
- Default https (SSL) port – 443
- Default configuration directory – /etc/apache2/
- Various configuration file directory – /etc/apache2/conf.d/
- Various configuration files to load modules and configure them directory – /etc/apache2/conf.d/mods-available/ , also /etc/apache2/conf.d/mods-enabled/ is symlinked to this directory.
- Apache virtual hosting configuration directory – /etc/apache2/sites-available/ ,also /etc/apache2/sites-enabled contains symlinks to the /etc/apache2/sites-available directory.
- Default main configuration file – /etc/apache2/apache2.conf
- Default TCP/IP ports configuration file – /etc/apache2/ports.conf
- Default environment configuration file – /etc/apache2/envvars (various Apache2 environment variables are set such as username, PID file etc.)
You can edit all the configuration files using nothing but a text editor such as vim or joe.
Confirm Minimal Built-in Modules
Type the following command to display the set of compiled-in modules
$ httpd -l
Compiled in modules: core.c mod_log_config.c mod_logio.c prefork.c http_core.c mod_so.c