How To Install Nginx on Ubuntu 20.04

Introduction

Nginx is one of the most popular web servers in the world and is responsible for hosting some of the largest and highest-traffic sites on the internet. It is a lightweight choice that can be used as either a web server or reverse proxy. In this guide, we’ll discuss how to install Nginx on your Ubuntu 20.04 server, adjust the firewall, manage the Nginx process, and set up server blocks for hosting more than one domain from a single server.

Prerequisites

Before you begin this guide, you should have a regular, non-root user with sudo privileges configured on your server.
When you have an account available, log in as your non-root user to begin.

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Step 1 – Installing Nginx

Because Nginx is available in Ubuntu’s default repositories, it is possible to install it from these repositories using the apt packaging system.
Since this is our first interaction with the apt packaging system in this session, we will update our local package index so that we have access to the most recent package listings.
Afterwards, we can install nginx:

sudo apt update
sudo apt install nginx

After accepting the procedure, apt will install Nginx and any required dependencies to your server.

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Step 2 – Adjusting the Firewall

Before testing Nginx, the firewall software needs to be adjusted to allow access to the service. Nginx registers itself as a service with ufw upon installation, making it straightforward to allow Nginx access.

List the application configurations that ufw knows how to work with by typing:

sudo ufw app list

You should get a listing of the application profiles:

Available applications:
tabNginx Full
tabNginx HTTP
tabNginx HTTPS
tabOpenSSH

As demonstrated by the output, there are three profiles available for Nginx:

• tab- Nginx Full: This profile opens both port 80 (normal, unencrypted web traffic) and port 443 (TLS/SSL encrypted traffic)

• tab- Nginx HTTP: This profile opens only port 80 (normal, unencrypted web traffic)

• tab- Nginx HTTPS: 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. Right now, we will only need to allow traffic on port 80.

You can enable this by typing:

sudo ufw allow "Nginx HTTP"

You can verify the change by typing:

sudo ufw status

The output will indicated which HTTP traffic is allowed:

Status: active

Totab tab tab tab Action tabtabFrom
--tab tab tab tab ------ tabtab----
OpenSSHtab tabtab ALLOWtab tab Anywhere
Nginx HTTPtab tab ALLOWtab tab Anywhere
OpenSSH (v6)tabtabALLOWtab tab Anywhere (v6)
Nginx HTTP (v6)tabALLOWtab tab Anywhere (v6)


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Step 3 – Checking your Web Server

At the end of the installation process, Ubuntu 20.04 starts Nginx. The web server should already be up and running.

We can check with the systemd init system to make sure the service is running by typing:

sudo systemctl status nginx
● nginx.service - A high performance web server and a reverse proxy server
tabLoaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)
tabActive: active (running) since Fri 2020-04-20 16:08:19 UTC; 3 days ago
tab tabDocs: man:nginx(8)
tabMain PID: 2369 (nginx)
tab tabTasks: 2 (limit: 1153)
tabMemory: 3.5M
tabCGroup: /system.slice/nginx.service
tab tab tab tab├─2369 nginx: master process /usr/sbin/nginx -g daemon on;
tabmaster_process on;
tab tab tab tab└─2380 nginx: worker process

As confirmed by this out, the service has started successfully. However, the best way to test this is to actually request a page from Nginx.

You can access the default Nginx landing page to confirm that the software is running properly by navigating to your server’s IP address. If you do not know your server’s IP address, you can find it by using the icanhazip.com tool, which will give you your public IP address as received from another location on the internet:

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 receive the default Nginx landing page:

If you are on this page, your server is running correctly and is ready to be managed.

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Step 4 – Managing the Nginx Process

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

To stop your web server, type:

sudo systemctl stop nginx

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

sudo systemctl start nginx

To stop and then start the service again, type:

sudo systemctl restart nginx

If you are only making configuration changes, Nginx can often reload without dropping connections. To do this, type:

sudo systemctl reload nginx

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

sudo systemctl disable nginx

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

sudo systemctl enable nginx

You have now learned basic management commands and should be ready to configure the site to host more than one domain.

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Step 5 – Setting Up Server Blocks (Recommended)

When using the Nginx web server, server blocks (similar to virtual hosts in Apache) can be used to encapsulate configuration details and host more than one domain from a single server. We will set up a domain called your_domain, but you should replace this with your own domain name.

Nginx on Ubuntu 20.04 has one server block enabled by default that is configured to serve documents out of a directory at /var/www/html. 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/html

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

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

The permissions of your web roots should be correct if you haven’t modified your umask value, which sets default file permissions. To ensure that your permissions are correct and allow the owner to read, write, and execute the files while granting only read and execute permissions to groups and others, you can input the following command:

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/html/index.html

Inside, add the following sample HTML:

Save and close the file by typing CTRL and X then Y and ENTER when you are finished.

In order for Nginx to serve this content, it’s necessary to create a server block with the correct directives. Instead of modifying the default configuration file directly, let’s make a new one at /etc/nginx/sites-available/your_domain:

sudo nano /etc/nginx/sites-available/your_domain

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

server {
tab tablisten80;
tab tablisten [::]:80;

tab tabroot /var/www/your_domain/html;
tab tabindex index.html index.htm index.nginx-debian.html;

tab tabserver_name your_domain www.your_domain;

tab tablocation / {
tab tab tabtry_files $ uri $ uri/ =404;
tab tab}
}

Notice that we’ve updated the root configuration to our new directory, and the server_name to our domain name.

Next, let’s enable the file by creating a link from it to the sites_enabled directory, which Nginx reads from during startup: sudo ln -s /etc/nginx/sites-available/your_domain /etc/nginx/sites-enabled/

Two server blocks are now enabled and configured to respond to requests based on their listen and server_name directives:

• tab- your_domain: Will respond to requests for your_domain and www.your_domain.

• tab- default: Will respond to any requests on port 80 that do not match the other two blocks.

To avoid a possible hash bucket memory problem that can arise from adding additional server names, it is necessary to adjust a single value in the /etc/nginx/nginx.conf file. Open the file:

sudo nano /etc/nginx/nginx.conf

Find the server_names_hash_bucket_size directive and remove the # symbol to uncomment the line. If you are using nano, you can quickly search for words in the file by pressing CTRL and w.

...
http {
tab...
tabserver_name_hash_bucket_size 64:
tab...
}
...

Save and close the file when you are finished.

Next, test to make sure that there are no syntax errors in any of your Nginx files:

sudo nginx -t

If there aren’t any problems, restart Nginx to enable your changes:

sudo systemctl restart nginx

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

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Step 6 – Getting Familiar with Important Nginx Files and Directories

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

Content

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

Server Configuration

tab- /etc/nginx: The Nginx configuration directory. All of the Nginx configuration files reside here.

tab- /etc/nginx/nginx.conf: The main Nginx configuration file. This can be modified to make changes to the Nginx global configuration.

tab- /etc/nginx/sites-available/: The directory where per-site server blocks can be stored. Nginx 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.

tab- /etc/nginx/sites-enabled/: The directory where enabled per-site server blocks are stored. Typically, these are created by linking to configuration files found in the sites-available directory.

tab- /etc/nginx/snippets: This directory contains configuration fragments that can be included elsewhere in the Nginx configuration. Potentially repeatable configuration segments are good candidates for refactoring into snippets.

Server Logs

tab- /var/log/nginx/access.log: Every request to your web server is recorded in this log file unless Nginx is configured to do otherwise.

tab- /var/log/nginx/error.log: Any Nginx errors will be recorded in this log.