Guides and Tutorials / DevOps

How to install UFW on Debian 11/Ubuntu 22.04

UFW (Uncomplicated Firewall) is a network firewall tool for Linux-based operating systems that focuses on simplifying firewall configuration. UFW provides an easy-to-use user interface for managing firewall rules, allowing system administrators to easily c (...)

How to use Cron to automate tasks in Ubuntu 22.04/Debian 11

The Cron is a tool used to automate tasks in Unix based operating systems, such as Ubuntu 22.04 and Debian 11. With Cron, you can schedule commands to run automatically at specific times of the day, week or month. In this manual, we will explain how to use (...)

Difference between PHP MAIL and PHP MAILER

PHP Mail and PHP Mailer are two very useful tools for sending e-mails from web applications developed in PHP. PHP Mail PHP Mail is a PHP function that allows you to send emails from a web application. To use PHP Mail, you will need the following: A web se (...)

How to install WordPress on Ubuntu 22.04 with LEMP

Here is the detailed manual on how to install WordPress on Ubuntu 22.04 with LEMP: Step 1: Update the Operating System Before you start installing WordPress, it is important to make sure that your Ubuntu 22.04 operating system is up to date. Open the termi (...)

How to create a web application using Flask in Python 3

Flask is a lightweight and flexible web framework for Python that allows you to build web applications quickly and easily. It focuses on simplicity and modularity, making it easy to learn and use for small and large projects. It requires no additional tool (...)

How to install Ruby on Rails with rbenv on Ubuntu 22.04

rbenv is a tool for managing multiple versions of Ruby on a single system. It allows you to install, switch and manage different versions of Ruby, which is useful for projects that require specific versions of Ruby or for working with different projects th (...)

How to configure SSH keys in Ubuntu 22.04/Debian 10

Introduction SSH is a secure network protocol used for remote server management. It is a secure way to connect to and perform operations on a server without the need to be physically present on the server. SSH keys are used to authenticate to a remote serv (...)

How to create a new user and grant permissions in MySQL

Here is a detailed manual on how to create a new user and grant permissions in MySQL: Step 1: Login to MySQL To create a new user and grant permissions in MySQL, you must log in to your MySQL server. You can do this in a number of ways, but a common way is (...)

How to remove images, containers and volumes from Docker

Docker is a container virtualisation tool that allows developers to create, deploy and run applications in different environments quickly and efficiently. Docker containers are software environments that contain everything needed to run an application, inc (...)

How to scale Node.js applications with clustering

Introduction Node.js is a server-side JavaScript runtime environment used to create scalable, high-speed web applications. Scalability is a critical factor for any web application that intends to handle large volumes of traffic. One of the most popular way (...)

How to install and use Docker on Ubuntu 20.04?

Introduction Docker is a container platform that has revolutionised the way developers build, test and deploy applications. This manual will explain how to install and use Docker on Ubuntu 20.04, allowing developers to quickly and easily create application (...)

Create your first Java 11 program on Ubuntu 22.04 or Debian 11

Java is one of the most widely used programming languages thanks to its great versatility, portability and its ability to create robust and scalable applications. It is an object-oriented language with a large number of libraries and tools that facilitate (...)

How to empty the Swap memory of a Linux server

Occasionally we may receive resource usage alerts indicating that the server's Swap or Exchange Memory is at 100% usage. SERVICE ALERT: ce00000000000.dnssw.net Unix Memory Nou WARNING Usage: real 95% (11404/11995 MB), buffer: 3 MB, cache: 302 MB, swap: 100 (...)

Create your first C++ program on Ubuntu 22.04 or Debian 11

C++ is a high-performance, generally compiled programming language. It combines object-oriented programming and low-level programming features, making it suitable for a wide range of applications, from software development to embedded systems or even games (...)

Sorting algorithms with examples in C++

Sorting algorithms are procedures or sets of instructions used to arrange a set of elements in a specific order. These algorithms are widely used in computer science and programming because of their importance for efficiency and process optimization. There (...)
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