Caddy is a web server that is designed to be easy to use and configure. It is written in the Go programming language and uses modern technologies such as HTTP/2 and QUIC to deliver fast and secure web experiences.

One of the key features of Caddy is its simplicity. It does not require complex configuration files and can be configured using a simple and intuitive configuration syntax. This makes it easy for even inexperienced users to set up and manage a web server.

Caddy also includes built-in support for HTTPS, which means that it automatically obtains and renews SSL/TLS certificates for your domain names. This means that you don’t have to worry about configuring and managing SSL/TLS certificates yourself, and your website will always be served over a secure HTTPS connection.

In addition to its ease of use and built-in HTTPS support, Caddy also offers a range of other features and benefits, including:

• Modularity: Caddy is designed to be modular, which means that you can easily add or remove features as needed.
• Extensibility: Caddy has a rich plugin ecosystem that allows you to extend its functionality with additional features and capabilities.
• Performance: Caddy is optimized for performance and is capable of delivering high-speed web experiences.
• Scalability: Caddy is designed to be scalable and can handle large numbers of concurrent connections without sacrificing performance.
• Security: Caddy includes a range of security features, such as automatic HTTPS and protection against common web attacks.

In summary, Caddy is a web server that offers a simple, easy-to-use, and secure way to host your websites and applications. Its modern technology and built-in features make it an attractive option for a wide range of users, from individual bloggers to large enterprises.

To install Caddy web server with PHP 8.1 on Ubuntu 22.04, you will need to follow these steps:

Install the prerequisites

Before you can install Caddy and PHP, you will need to make sure that you have the necessary prerequisites installed on your system. This includes a working installation of Ubuntu 22.04 and the following packages:

sudo apt-get install curl software-properties-common

Install Caddy

To install Caddy on Ubuntu 22.04, you will need to add the Caddy repository to your system using the following commands:

curl <https://getcaddy.com> | bash -s personal

This will add the Caddy repository to your system and install the latest version of Caddy.

Install PHP 8.1

To install PHP 8.1 on Ubuntu 22.04, you will need to add the PHP repository to your system using the following commands:

sudo apt-get install apt-transport-https lsb-release ca-certificates
sudo wget -O /etc/apt/trusted.gpg.d/php.gpg <https://packages.sury.org/php/apt.gpg>
echo "deb <https://packages.sury.org/php/> $(lsb_release -sc) main" | sudo tee /etc/apt/sources.list.d/php.list

This will add the PHP repository to your system and allow you to install PHP 8.1 using the following command:

sudo apt-get update
sudo apt-get install php8.1-fpm

Configure Caddy and PHP

Once you have installed Caddy and PHP, you will need to configure them to work together. To do this, you will need to edit the Caddy configuration file and add the following lines:

localhost

root * /var/www/html

fastcgi / /var/run/php/php8.1-fpm.sock php

This will tell Caddy to serve PHP files using the PHP 8.1 FastCGI Process Manager (FPM) socket.

Restart Caddy and PHP

After you have made the necessary configuration changes, you will need to restart Caddy and PHP using the following commands:

sudo systemctl restart caddy
sudo systemctl restart php8.1-fpm

Your Caddy web server with PHP 8.1 should now be installed and running on Ubuntu 22.04. You can verify this by creating a test PHP file in the /var/www/html directory and accessing it in your web browser.

If you have any problems or need further assistance, you can consult the Caddy and PHP documentation for more information.