In this guide we will cover steps to install PHP 7.4 in Ubuntu 20.04 and set up php-fpm to serve that traffic with the help of Nginx.

PHP is a general-purpose scripting language. It is mostly popular for web development. It can be used to develop dynamic and interactive websites. It was among the first server-side languages that could be embedded into HTML, making it easier to add functionality to web pages without needing to call external files for data. PHP is among the easier programming languages to learn.

It is integrated with a number of popular databases, including MySQL, PostgreSQL, Oracle, Sybase, Informix, and Microsoft SQL Server. Many popular CMS and frameworks such as WordPress, Magento, and Laravel are written in PHP.

At the time of writing this article, the default Ubuntu 20.04 repositories include PHP 7.4 version.

Prerequisites

To follow along this guide, ensure that you have the following:

1. Updated Ubuntu 20.04/22.04 server that is connected to the internet
2. Root access to the server or user with sudo access
3. You should comfortable with using Linux terminal to execute commands.

Ensure that the server is up to date

Before proceeding, let us ensure that our server is updated. Use these commands to 1. Update the server repositories, 2. Upgrade server packages to the latest releases:

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sudo apt update

# Upgrade packages
sudo apt -y upgrade

Install php 7.4 on the server

Since the default repositories contain php version 7.4, let’s install it with this command:

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sudo apt install php -y

Confirm the installed version with the command php -v:

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$ php -v

PHP 7.4.3 (cli) (built: Aug 13 2021 05:39:12) ( NTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies
    with Zend OPcache v7.4.3, Copyright (c), by Zend Technologies

In this set up, we intend to serve php files with Nginx. Nginx doesn’t have built-in support for processing PHP files. We’ll use PHP-FPM (“fastCGI process manager”) to handle the PHP files.

Nginx will not work if Apache is installed and running. Since we will be using Nginx, let’s use this command to remove apache if it is installed in our sytstem:

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sudo apt remove apache2 -y

Let’s now install php-fpm with this command:

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sudo apt install php-fpm -y

Once the installation is completed, the FPM service will start automatically. The service is added to systemd as php7.4-fpm. To check the status of the service, run:

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$ sudo systemctl status php7.4-fpm

● php7.4-fpm.service - The PHP 7.4 FastCGI Process Manager
        Loaded: loaded (/lib/systemd/system/php7.4-fpm.service; enabled; vendor preset: enabled)
        Active: active (running) since Tue 2021-09-28 16:18:41 UTC; 3min 18s ago
        Docs: man:php-fpm7.4(8)
    Main PID: 56092 (php-fpm7.4)
        Status: "Processes active: 0, idle: 2, Requests: 0, slow: 0, Traffic: 0req/sec"
        Tasks: 3 (limit: 4710)
        Memory: 7.1M
        CGroup: /system.slice/php7.4-fpm.service
                ├─56092 php-fpm: master process (/etc/php/7.4/fpm/php-fpm.conf)
                ├─56113 php-fpm: pool www
                └─56114 php-fpm: pool www

Sep 28 16:18:41 ip-172-26-11-229 systemd[1]: Starting The PHP 7.4 FastCGI Process Manager...
Sep 28 16:18:41 ip-172-26-11-229 systemd[1]: Started The PHP 7.4 FastCGI Process Manager.

You should see output like above.

Installing Nginx

Now that PHP and php-fpm are installed in the system, we need to install nginx. Nginx will allow us to set up a virtual host that we can use to serve traffic from a domain.

Install nginx using this command:

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sudo apt install nginx -y

Once the installation is done, Nginx will be started by default. Confirm that it is working as expected by checking its status. You should see output like this:

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$ sudo systemctl status nginx
● nginx.service - A high performance web server and a reverse proxy server
        Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)
        Active: active (running) since Tue 2021-09-28 16:28:30 UTC; 1min 2s ago
        Docs: man:nginx(8)
    Main PID: 56990 (nginx)
        Tasks: 3 (limit: 4710)
        Memory: 3.7M
        CGroup: /system.slice/nginx.service
                ├─56990 nginx: master process /usr/sbin/nginx -g daemon on; master_process on;
                ├─56991 nginx: worker process
                └─56992 nginx: worker process

Sep 28 16:28:30 ip-172-26-11-229 systemd[1]: Starting A high performance web server and a reverse pr>
Sep 28 16:28:30 ip-172-26-11-229 systemd[1]: Started A high performance web server and a reverse pro>

To confirm that Nginx is actually running and is reachable, use this command:

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curl http://server_ip/

Where server_ip is the ip of your server. If by any reason you do not know the public ip of your server use this to check:

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curl -4 icanhazip.com

You should see the Nginx default page.

Configure Nginx to serve php file

Now that we have Nginx set up and running in our server, let’s make it serve php files. In this example we will configure Nginx to serve the php info page.

To achieve this, we need to set up a virtual host in Nginx serving traffic for a specific domain (we will use example.citizix.com). For this to work you need to update the DNS records for that domain in your dns host to have A records point to that domain or subdomain. Consult your DNS providers documentation for the specifics of how to do that.

Confirm that the domain can resolve correctly to the server using the dig command:

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$ dig -t A example.citizix.com

; <<>> DiG 9.10.6 <<>> -t A example.citizix.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 10212
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;example.citizix.com.       IN  A

;; ANSWER SECTION:
example.citizix.com.    300 IN  A   172.67.197.11

;; Query time: 828 msec
;; SERVER: 192.168.157.227#53(192.168.157.227)
;; WHEN: Tue Sep 28 20:42:05 EAT 2021
;; MSG SIZE  rcvd: 80

Now we need to follow these steps to have our simple script working:

• Create the directory to store our static content (we will use /var/www/example.citizix.com)

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

• Ensure the created directory is accessible by the Nginx user

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sudo chown -R www-data:www-data /var/www/example.citizix.com
sudo chmod -R 755 /var/www/example.citizix.com

• Add an index file /var/www/example.citizix.com/index.php with content to show php info to the directory (/var/www/example.citizix.com). Edit the file:

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sudo vim /var/www/example.citizix.com/index.php

Add this content:

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<?php
    phpinfo()
?>

Save and close the file.

• Create nginx configuration in the nginx default directory /etc/nginx/conf.d. 1. We will create the file /etc/nginx/conf.d/example.citizix.com.conf with the required content.

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sudo vim /etc/nginx/conf.d/example.citizix.com.conf

Add this content:

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server {
    listen 80;
    server_name example.citizix.com;

    root /var/www/example.citizix.com;
    index index.php;

    location ~ \.php$ {
        fastcgi_intercept_errors on;
        include        fastcgi_params;
        fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
        include snippets/fastcgi-php.conf;
        fastcgi_pass unix:/run/php/php7.4-fpm.sock;
    }
}

Confirm that nginx config is correct with this command:

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$ sudo nginx -t

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

Now you need to restart nginx and php-fpm using these commands:

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sudo systemctl restart nginx
sudo systemctl restart php7.4-fpm

Confirm that the services came up:

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sudo systemctl status nginx
sudo systemctl status php7.4-fpm

You should see that the services restarted successfully!

If all goes well, you should see the php info page when you load the site url.

That’s all! Up to this point we have been able to install php 7.4 in Ubuntu 20.04 and serve simple file with Nginx.