How To Install Nginx on Ubuntu 18.04

Prerequisites

A system running Ubuntu 18.04
A user account with sudo privileges
SSH Access

Steps to Installing Nginx on Ubuntu

Update Software Repositories

Log into your Server via SSH as the root user

ssh root@hostname

Before installing new software, it is strongly recommended to update your local software database. Updating helps to make sure you’re installing the latest and best-patched software available.

Enter the following:

sudo apt update

Allow the process to finish.

Install Nginx on Ubuntu

Enter the following to install Nginx on Ubuntu:

sudo apt install nginx

This may take some time for the system to download the software packages and install them. Allow it to complete before moving on.

Verify Nginx Service is Running

Use the following command to check the status of the Nginx service:

sudo systemctl status nginx

The system should return a list of information about the Nginx service. The active line indicates whether the service is running or not. If you need to start the service, use the following:

sudo systemctl start nginx

You can also use the following commands in place of start:

```
sudo systemctl stop nginx
```
– stops the Nginx service
```
sudo systemctl enable nginx
```
– enables Nginx to load at startup
```
sudo systemctl disable nginx
```
– prevents Nginx from loading at startup

Allow Nginx Traffic through a Firewall

You can generate a list of the firewall rules using the following command:

sudo ufw app list

This should generate a list of application profiles. On the list, you should see four entries related to Nginx:

```
Nginx full
```
– opens Port 80 for normal web traffic, and Port 443 for secure encrypted web traffic
```
Nginx HTTP
```
– Opens Port 80 for normal web traffic
```
Nginx HTTPS
```
– Opens Port 443 for encrypted web traffic
```
OpenSSH
```
– This is a configuration for SecureShell operations, which allow you to log into a remote server through a secure, encrypted connection

To allow normal HTTP traffic to your Nginx server, use the Nginx HTTP profile with the following command:

sudo ufw allow ‘Nginx HTTP’

To check the status of your firewall, use the following command:

sudo ufw status

It should display a list of the kind of HTTP web traffic allowed to different services. Nginx HTTP should be listed as ALLOW and Anywhere.

Test Nginx in a Web Browser

Open a web browser, such as Firefox.

Enter your system’s IP address in the address bar or type localhost.

Your browser should display a page welcoming you to Nginx.

Define Server Blocks

Nginx uses a configuration file to determine how it behaves. One way to use the configuration file is to define server blocks, which work similar to an Apache Virtual Host.

Nginx is designed to act as a front for multiple servers, which is done by creating server blocks.

By default, the main Nginx configuration file is located at /etc/nginx/nginx.conf. Server block configuration files are located at /etc/nginx/sites-available.

To view the contents of the default server block configuration file, enter the following command in a terminal:

sudo vi /etc/nginx/sites-available/default

This should open the default configuration file in the Vi text editor, which should look something like this:

# Default server configuration
#
server {
listen 80 default_server;
listen [::]:80 default_server;
[...]
root /var/www/html;
# Add index.php to the list if you are using PHP
index index.html index.htm index.nginx-debian.html;
server_name _;
location / {
# First attempt to serve request as file, then
# as directory, then fall back to displaying a 404.
try_files $uri $uri/ =404;
}
[...]
}

The listen commands tell Nginx which ports to look at for traffic
Default_server defines this as the block to be delivered unless otherwise specified by the client
Root determines which directory holds the root directory for the website that’s being served
Server_name allows you to specify a name for a particular server block, which is used in more advanced configurations
Location allows you to direct the location where Nginx should route traffic

Create a Sample Server Block

Set up an HTML File

Going through a sample configuration is helpful. In a terminal window, enter the following command to create a “test” directory to work with:

sudo mkdir /var/www/example

Create and open a basic HTML index file to work as a test webpage:

sudo vi /var/www/example/index.html

In the Vi text editor (you can substitute your preferred text editor if you’d like), enter the following:

Welcome to the Example Website!

Save the file and exit.

Set up a Simple Server Block

Use the following command to create a new server block file for our Test website:

sudo vi /etc/nginx/sites-available/example.com

This should launch the Vi text editor and create a new server block file.
Enter the following lines into the text file:

server {
listen 80;
root /var/www/example;
index index.html;
server_name www.example.com;
}

This tells Nginx to look at the /var/www/example directory for the files to serve, and to use the index.html file we created as the front page for the website.
Save the file and exit.

Create a Symbolic Link to Activate Server Block

In the terminal window, enter the following command:

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

This creates a link and enables your test website in Nginx. Restart the Nginx service to apply the changes:

sudo systemctl restart nginx

Start Testing

In a browser window, visit www.example.com.

Nginx should intercept the request, and display the text we entered in the HTML file.

Conclusion

In this guide, you have learned how to configure, setup, and install Nginx on Ubuntu 18.04.