Author: Rahul

An Armstrong number is a number that is equal to the sum of its digits each raised to the power of the number of digits. For instance, in a 3-digit number like 153, the sum of the cubes of each digit (1^3 + 5^3 + 3^3 = 153) equals the number itself. Thus, 153 is an Armstrong number. In this article, we will explore a Python program to check whether a number is an Armstrong number. This is a common problem, often seen in computer programming and coding interviews. Prerequisites To understand and implement this program, you should have a…

In the world of programming, there are many different tasks and algorithms that are commonly implemented to test a programmer’s understanding of certain concepts. One of these tasks is checking for Armstrong numbers. Before we dive into the actual programming part, it’s important to understand what an Armstrong number is. What is an Armstrong Number? An Armstrong number is a number that is equal to the sum of its own digits, each raised to the power of the number of digits. For example, let’s take 371. It’s a 3-digit number and the sum of the cubes of its digits (3^3…

Git is an indispensable tool for any software developer, providing an efficient way to manage and track changes in source code. Among its various commands, ‘git reset’ is a powerful one that aids in navigating the project’s history, altering commits, and even discarding changes. Despite its utility, it can be a little confusing to understand, especially for beginners. This article provides a comprehensive guide on the ‘git reset’ command with practical examples. What is Git Reset? In simple terms, ‘git reset’ is a command used to undo changes in a Git repository. It moves or alters the “HEAD” pointer in…

In an increasingly interconnected world, internet security has become a paramount concern. While browsing online, you’ve likely come across the peculiar images, jumbled text, or series of click-based puzzles required to prove that you’re not a robot. This cybersecurity tool, known as CAPTCHA, has become an essential component of online security, operating as an invisible guardian in the digital realm. But what exactly is CAPTCHA, and how does it work? Let’s delve deeper into this fascinating topic. What is CAPTCHA? CAPTCHA stands for “Completely Automated Public Turing test to tell Computers and Humans Apart”. In layman’s terms, a CAPTCHA is…

Nginx is a powerful and flexible web server, used by millions of websites worldwide. While its default configuration is reasonably secure, there are additional steps you can take to further improve your Nginx server’s security. In this article, we will cover various tips and tricks to help you harden your Nginx web server and protect it from potential threats. 1. Keep software up-to-date Regularly updating your Nginx server and related software ensures that you have the latest security patches and bug fixes. Use your operating system’s package manager to keep track of updates, and subscribe to security mailing lists for…

Git is an industry-standard distributed version control system used for software development and other version control tasks. It facilitates collaboration, allowing multiple contributors to work on a project concurrently without overriding each other’s changes. Among the numerous commands in Git, git checkout and git switch are two that play a critical role in navigating through different branches of a repository. Understanding the similarities and differences between these commands, as well as their appropriate uses, is vital for effective Git operation. `git switch` is a relatively new command, introduced in Git 2.23.0, designed to simplify certain operations that were traditionally performed…

The Squid proxy server is an open-source, high-performance proxy caching server for web clients that supports FTP, HTTPS, and HTTP data objects. It is mainly designed to accelerate content delivery by caching frequently requested data and freeing bandwidth. A lesser-known feature of Squid, however, is the ability to restrict access to certain websites or to block specific keywords. This article will guide you through the steps needed to block specific keywords using Squid proxy server. Before we proceed, please note that you should have root or sudo user access to the Squid server to configure these settings. Step 1: Install…

Linux, being an open-source operating system, offers a wealth of features that help system administrators to automate their routine tasks. One of these features is the Cron utility, which allows you to schedule tasks, called ‘cron jobs’, to run periodically at fixed times, dates, or intervals. But what happens if you accidentally lose all your cron jobs due to some mishap? This is where having a backup of your crontab file comes in handy. This article aims to guide you on how to restore crontab from backup in Linux. Understanding Crontab The term ‘crontab’ is a blend of ‘cron table’,…

Git is a distributed version control system that lets multiple people work on the same project at the same time without overwriting each other’s changes. This powerful tool is centered around the concept of commits, each of which represents a snapshot of your project at a particular point in time. One of the most fundamental concepts of Git is the HEAD, and understanding this can significantly enhance your understanding of how Git works. What is HEAD in Git? In Git, HEAD is a reference to the current snapshot of your project. It always points to the most recent commit and…

Kubernetes is a powerful and widely adopted container orchestration platform that automates the deployment, scaling, and management of containerized applications. In this comprehensive introduction, we will cover the basics of Kubernetes for beginners, including its history, architecture, key components, and benefits. By the end of this article, you will have a solid understanding of the platform and be well on your way to leveraging Kubernetes for your own container-based projects. Table of Contents The Emergence of Containers and Kubernetes Kubernetes Architecture Nodes Control Plane etcd Key Components of Kubernetes Pods Services Deployments ConfigMaps and Secrets Ingress Benefits of Kubernetes Getting…