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Introduction

The Apache HTTP server is the most widely-used web server in the world. It provides many powerful features including dynamically loadable modules, robust media support, and extensive integration with other popular software.

In this guide, we’ll explain how to install an Apache web server on your Debian 10 server.

Prerequisites

Before you begin this guide, you should have a regular, non-root user with sudo privileges configured on your server. Additionally, you will need to enable a basic firewall to block non-essential ports.

When you have an account available, log in as your non-root user to begin.

Step 1 — Installing Apache

Apache is available within Debian’s default software repositories, making it possible to install it using conventional package management tools.

Let’s begin by updating the local package index to reflect the latest upstream changes:

• sudo apt update

Then, install the apache2 package:

• sudo apt install apache2

After confirming the installation, apt will install Apache and all required dependencies.

Step 2 — Adjusting the Firewall

Before testing Apache, it’s necessary to modify the firewall settings to allow outside access to the default web ports. Assuming that you followed the instructions in the prerequisites, you should have a UFW firewall configured to restrict access to your server.

During installation, Apache registers itself with UFW to provide a few application profiles that can be used to enable or disable access to Apache through the firewall.

List the ufw application profiles by typing:

• sudo ufw app list

You will see a list of the application profiles:

Available applications:
  AIM
  Bonjour
  CIFS
. . . 
 WWW
 WWW Cache
 WWW Full
 WWW Secure
. . . 

The Apache profiles begin with WWW:

• WWW: This profile opens only port 80 (normal, unencrypted web traffic)
• WWW Cache: This profile opens only port 8080 (sometimes used for caching and web proxies)
• WWW Full: This profile opens both port 80 (normal, unencrypted web traffic) and port 443 (TLS/SSL encrypted traffic)
• WWW Secure: This profile opens only port 443 (TLS/SSL encrypted traffic)

It is recommended that you enable the most restrictive profile that will still allow the traffic you’ve configured. Since we haven’t configured SSL for our server yet in this guide, we will only need to allow traffic on port 80:

• sudo ufw allow 'WWW'

You can verify the change by typing:

• sudo ufw status

You should see HTTP traffic allowed in the displayed output:

Status: active

To                         Action      From
--                         ------      ----
OpenSSH                    ALLOW       Anywhere
WWW                        ALLOW       Anywhere
OpenSSH (v6)               ALLOW       Anywhere (v6)
WWW (v6)                   ALLOW       Anywhere (v6)

As you can see, the profile has been activated to allow access to the web server.

Step 3 — Checking your Web Server

At the end of the installation process, Debian 10 starts Apache. The web server should already be up and running.

Check with the systemd init system to make sure the service is running by typing:

• sudo systemctl status apache2

● apache2.service - The Apache HTTP Server
   Loaded: loaded (/lib/systemd/system/apache2.service; enabled; vendor preset: enabled)
   Active: active (running) since Fri 2019-07-19 15:33:01 UTC; 4min 13s ago
     Docs: https://httpd.apache.org/docs/2.4/

. . .

Jul 19 15:33:01 debssh systemd[1]: Starting The Apache HTTP Server...
Jul 19 15:33:01 debssh apachectl[2791]: AH00558: apache2: Could not reliably determine the server's fully qualified domain name, 
using 127.0.1.1. Set the 'ServerName' directive global
Jul 19 15:33:01 debssh systemd[1]: Started The Apache HTTP Server.

As you can see from this output, the service appears to have started successfully. However, the best way to test this is to request a page from Apache.

You can access the default Apache landing page to confirm that the software is running properly through your IP address. If you do not know your server’s IP address, you can get it a few different ways from the command line.

Try typing this at your server’s command prompt:

• hostname -I

You will get back a few addresses separated by spaces. You can try each in your web browser to see if they work.

An alternative is using the curl tool, which should give you your public IP address as seen from another location on the internet.

First, install curl using apt:

• sudo apt install curl

Then, use curl to retrieve icanhazip.com using IPv4:

• curl -4 icanhazip.com

When you have your server’s IP address, enter it into your browser’s address bar:

http://your_server_ip

You should see the default Debian 10 Apache web page:

This page indicates that Apache is working correctly. It also includes some basic information about important Apache files and directory locations.

Step 4 — Managing the Apache Process

Now that you have your web server up and running, let’s go over some basic management commands.

To stop your web server, type:

• sudo systemctl stop apache2

To start the web server when it is stopped, type:

• sudo systemctl start apache2

To stop and then start the service again, type:

• sudo systemctl restart apache2

If you are simply making configuration changes, Apache can often reload without dropping connections. To do this, use this command:

• sudo systemctl reload apache2

By default, Apache is configured to start automatically when the server boots. If this is not what you want, disable this behavior by typing:

• sudo systemctl disable apache2

To re-enable the service to start up at boot, type:

• sudo systemctl enable apache2

Apache should now start automatically when the server boots again.

Step 5 — Setting Up Virtual Hosts (Recommended)

When using the Apache web server, you can use virtual hosts (similar to server blocks in Nginx) to encapsulate configuration details and host more than one domain from a single server. In the following commands, replace your_domain with your own domain name.

Apache on Debian 10 has one server block enabled by default that is configured to serve documents from the /var/www/html directory. While this works well for a single site, it can become unwieldy if you are hosting multiple sites. Instead of modifying /var/www/html, let’s create a directory structure within /var/www for our your_domain site, leaving /var/www/html in place as the default directory to be served if a client request doesn’t match any other sites.

Create the directory for your_domain as follows, using the -p flag to create any necessary parent directories:

sudo mkdir -p /var/www/your_domain

Next, assign ownership of the directory with the $USER environmental variable:

• sudo chown -R $USER:$USER /var/www/your_domain

The permissions of your web roots should be correct if you haven’t modified your unmask value, but you can make sure by typing:

• sudo chmod -R 755 /var/www/your_domain

Next, create a sample index.html page using nano or your favorite editor:

• nano /var/www/your_domain/index.html

Inside, add the following sample HTML:

<html>
    <head>
        <title>Welcome to your_domain!</title>
    </head>
    <body>
        <h1>Success!  The your_domain virtual host is working!</h1>
    </body>
</html>

Save and close the file when you are finished.

In order for Apache to serve this content, it’s necessary to create a virtual host file with the correct directives. Instead of modifying the default configuration file located at /etc/apache2/sites-available/000-default.conf directly, let’s make a new one at /etc/apache2/sites-available/your_domain.conf:

• sudo nano /etc/apache2/sites-available/your_domain.conf

Paste in the following configuration block, which is similar to the default, but updated for our new directory and domain name:

<VirtualHost *:80>
    ServerAdmin admin@your_email_domain
    ServerName your_domain
    ServerAlias www.your_domain
    DocumentRoot /var/www/your_domain
    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

Notice that we’ve updated the DocumentRoot to our new directory and ServerAdmin to an email that the your_domain site administrator can access. We’ve also added two directives: ServerName, which establishes the base domain that should match for this virtual host definition, and ServerAlias, which defines further names that should match as if they were the base name.

Save and close the file when you are finished.

Let’s enable the file with the a2ensite tool:

• sudo a2ensite your_domain.conf

Disable the default site defined in 000-default.conf:

• sudo a2dissite 000-default.conf

Next, let’s test for configuration errors:

• sudo apache2ctl configtest

You should see the following output:

AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. 
Set the 'ServerName' directive globally to suppress this message
Syntax OK

Restart Apache to implement your changes:

• sudo systemctl restart apache2

Apache should now be serving your domain name. You can test this by navigating to http://your_domain, where you should see something like this:

Step 6 – Getting Familiar with Important Apache Files and Directories

Now that you know how to manage the Apache service itself, you should take a few minutes to familiarize yourself with a few important directories and files.

Content

• /var/www/html: The actual web content, which by default only consists of the default Apache page you saw earlier, is served out of the /var/www/html directory. This can be changed by altering Apache configuration files.

Server Configuration

• /etc/apache2: The Apache configuration directory. All of the Apache configuration files reside here.
• /etc/apache2/apache2.conf: The main Apache configuration file. This can be modified to make changes to the Apache global configuration. This file is responsible for loading many of the other files in the configuration directory.
• /etc/apache2/ports.conf: This file specifies the ports that Apache will listen on. By default, Apache listens on port 80 and additionally listens on port 443 when a module providing SSL capabilities is enabled.
• /etc/apache2/sites-available/: The directory where per-site virtual hosts can be stored. Apache will not use the configuration files found in this directory unless they are linked to the sites-enabled directory. Typically, all server block configuration is done in this directory, and then enabled by linking to the other directory with the a2ensite command.
• /etc/apache2/sites-enabled/: The directory where enabled per-site virtual hosts are stored. Typically, these are created by linking to configuration files found in the sites-available directory with the a2ensite. Apache reads the configuration files and links found in this directory when it starts or reloads to compile a complete configuration.
• /etc/apache2/conf-available/, /etc/apache2/conf-enabled/: These directories have the same relationship as the sites-available and sites-enabled directories, but are used to store configuration fragments that do not belong in a virtual host. Files in the conf-available directory can be enabled with the a2enconf command and disabled with the a2disconf command.
• /etc/apache2/mods-available/, /etc/apache2/mods-enabled/: These directories contain the available and enabled modules, respectively. Files in ending in .load contain fragments to load specific modules, while files ending in .conf contain the configuration for those modules. Modules can be enabled and disabled using the a2enmod and a2dismod command.

Server Logs

• /var/log/apache2/access.log: By default, every request to your web server is recorded in this log file unless Apache is configured to do otherwise.
• /var/log/apache2/error.log: By default, all errors are recorded in this file. The LogLevel directive in the Apache configuration specifies how much detail the error logs will contain.

Conclusion

Now that you have your web server installed, you have many options for the type of content you can serve and the technologies you can use to create a richer experience.