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 9 server.
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. You can learn how to configure a regular user account and set up a firewall for your server by following our initial server setup guide for Debian 9.
When you have an account available, log in as your non-root user to begin.
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 updateThen, install the apache2 package:
sudo apt install apache2After confirming the installation, apt will install Apache and all required dependencies.
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 listYou will see a list of the application profiles:
OutputAvailable applications: AIM Bonjour CIFS. . . WWW WWW Cache WWW Full WWW Secure. . . The Apache profiles begin with WWW:
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 statusYou should see HTTP traffic allowed in the displayed output:
OutputStatus: activeTo Action From-- ------ ----OpenSSH ALLOW AnywhereWWW ALLOW AnywhereOpenSSH (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.
At the end of the installation process, Debian 9 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 apache2Output● apache2.service - The Apache HTTP Server Loaded: loaded (/lib/systemd/system/apache2.service; enabled; vendor preset: enabled) Active: active (running) since Wed 2018-09-05 19:21:48 UTC; 13min ago Main PID: 12849 (apache2) CGroup: /system.slice/apache2.service ├─12849 /usr/sbin/apache2 -k start ├─12850 /usr/sbin/apache2 -k start └─12852 /usr/sbin/apache2 -k startSep 05 19:21:48 apache systemd[1]: Starting The Apache HTTP Server…Sep 05 19:21:48 apache 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 -IYou 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 curlThen, use curl to retrieve icanhazip.com using IPv4:
curl -4 icanhazip.comWhen you have your server’s IP address, enter it into your browser’s address bar:
http://your_server_ipYou should see the default Debian 9 Apache web page:
This page indicates that Apache is working correctly. It also includes some basic information about important Apache files and directory locations.
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 apache2To start the web server when it is stopped, type:
sudo systemctl start apache2To stop and then start the service again, type:
sudo systemctl restart apache2If you are simply making configuration changes, Apache can often reload without dropping connections. To do this, use this command:
sudo systemctl reload apache2By 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 apache2To re-enable the service to start up at boot, type:
sudo systemctl enable apache2Apache should now start automatically when the server boots again.
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. We will set up a domain called example.com, but you should replace this with your own domain name. To learn more about setting up a domain name with DigitalOcean, see our Introduction to DigitalOcean DNS.
Apache on Debian 9 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 example.com 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 example.com as follows, using the -p flag to create any necessary parent directories:
sudo mkdir -p /var/www/example.com/htmlNext, assign ownership of the directory with the $USER environmental variable:
sudo chown -R $USER:$USER /var/www/example.com/htmlThe 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/example.comNext, create a sample index.html page using nano or your favorite editor:
nano /var/www/example.com/html/index.htmlInside, add the following sample HTML:
/var/www/example.com/html/index.html
<html> <head> <title>Welcome to Example.com!</title> </head> <body> <h1>Success! The example.com 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/example.com.conf:
sudo nano /etc/apache2/sites-available/example.com.confPaste in the following configuration block, which is similar to the default, but updated for our new directory and domain name:
/etc/apache2/sites-available/example.com.conf
<VirtualHost *:80> ServerAdmin admin@example.com ServerName example.com ServerAlias www.example.com DocumentRoot /var/www/example.com/html 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 example.com 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 example.com.confDisable the default site defined in 000-default.conf:
sudo a2dissite 000-default.confNext, let’s test for configuration errors:
sudo apache2ctl configtestYou should see the following output:
OutputSyntax OKRestart Apache to implement your changes:
sudo systemctl restart apache2Apache should now be serving your domain name. You can test this by navigating to http://example.com, where you should see something like this:
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.
/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./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-availabledirectory 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./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 LogLeveldirective in the Apache configuration specifies how much detail the error logs will contain.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.
If you’d like to build out a more complete application stack, you can look at this article on how to configure a LAMP stack on Debian 9.