Nginx Server Blocks allows you to run more than one website on a  single machine. With Server Blocks, you can specify the site document  root (the directory which contains the website files), create a separate  security policy for each site, use different SSL certificates for each  site, and much more.

In this tutorial, we will show you how to set up Nginx server blocks on Debian 9.

Prerequisites

Ensure that you have met the following prerequisites before continuing with this tutorial:

In some documentation, you’ll see Server Blocks being referred to as a Virtual host. A virtual host is an Apache term.

Create the Directory Structure

The  document root is the directory where the website files for a domain  name are stored and served in response to requests. The document root  can be any directory on your Debian server.

We will use the following directory structure:

/var/www/
├── domain1.com
│   └── public_html
├── domain2.com
│   └── public_html
├── domain3.com
│   └── public_html

Copy

We’ll create a separate directory for each domain that will be hosted on the server inside the /var/www directory. Within each of these directories, we’ll create a public_html directory that will store the domain website files.

Start by creating the root directory for the domain example.com:

sudo mkdir -p /var/www/example.com/public_html

Next, create an index.html file inside the domain’s document root directory.

sudo nano /var/www/example.com/public_html/index.html

Open the file and paste the following lines:

/var/www/example.com/public_html/index.html

<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title>Welcome to example.com</title>
  </head>
  <body>
    <h1>Success! example.com home page!</h1>
  </body>
</html>

Copy

To avoid permission issues change the ownership of the domain document root directory to the Nginx user (www-data):

sudo chown -R www-data: /var/www/example.com

Create a Server Block

By default on Debian systems, Nginx server blocks configuration files are stored in /etc/nginx/sites-available directory, which are enabled through symbolic links to the /etc/nginx/sites-enabled/ directory.

Open your editor of choice and create the following server block file:

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

/etc/nginx/sites-available/example.com.conf

server {
    listen 80;
    listen [::]:80;

    root /var/www/example.com/public_html;

    index index.html;

    server_name example.com www.example.com;

     access_log /var/log/nginx/example.com.access.log;
     error_log /var/log/nginx/example.com.error.log;

    location / {
        try_files $uri $uri/ =404;
    }
}

Copy

You can name the configuration file as you like but usually it is best to use the domain name.

Enable the new server block file by creating a symbolic link from the file to the sites-enabled directory:

sudo ln -s /etc/nginx/sites-available/example.com.conf /etc/nginx/sites-enabled/

Test the Nginx configuration for correct syntax:

sudo nginx -t

If there are no errors, the output will look like this:

nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful

Restart the Nginx service for the changes to take effect:

sudo systemctl restart nginx

Finally, to verify the server block is working as expected open http://example.com in your browser of choice, and you will see something like this:

Conclusion

You  have learned how to create an Nginx server block configuration to host  multiple domains on a single Debian server. You can repeat the steps we  outlined above and create additional server blocks for all your domains.

If you are facing any problem, feel free to leave a comment.