Author: Rahul

Kubernetes, often called K8s, is a powerful system for managing containerized applications across a cluster of machines. If you’re new to this, don’t worry. Setting up a Kubernetes cluster on Ubuntu is straightforward and this guide will walk you through it step-by-step. By the end, you’ll have a working K8s cluster where you can deploy and manage your applications easily. In simple terms, a Kubernetes cluster consists of one master node that controls and manages several worker nodes. These nodes run your applications in containers. Ubuntu, a popular Linux distribution, is an excellent choice for setting up a K8s cluster…

Setting up Kubernetes on Ubuntu is a journey that transforms your infrastructure into a container orchestration powerhouse, enabling you to deploy, scale, and manage application containers across a cluster of machines. Kubernetes, also known as K8s, automates the deployment, scaling, and operation of application containers, making it easier for developers and sysadmins to manage applications. This article provides a comprehensive guide to setting up Kubernetes on Ubuntu, covering everything from installation to operation. Whether you’re setting up a single-node cluster for development or a multi-node cluster for production, this guide will walk you through the necessary steps to get your…

HAProxy is a free, open-source software that provides a high availability load balancer and proxy server for TCP and HTTP-based applications. It is particularly suited for very high traffic web sites and powers quite a number of the world’s most visited ones. Setting up HAProxy on CentOS/RHEL (Red Hat Enterprise Linux) can enhance your network infrastructure by improving its performance and reliability. This guide will walk you through the steps needed to install and configure HAProxy on CentOS/RHEL 9/8. Prerequisites A CentOS/RHEL 9/8 server A non-root user with sudo privileges Step 1: Update Your System Before installing any package, it’s…

In the world of Docker, encountering errors is part of the learning curve. One such common hiccup is the “-bash: ping: command not found” error. This message pops up when you’re inside a Docker container trying to use the ping command to test connectivity with other networked machines or services, but the command is not available in your container’s environment. This article will guide you through understanding this issue and how to resolve it. Understanding the Issue This issue is generally found with Docker containers because of containers are designed to be lightweight, running minimal installations of operating systems. By…

JSON (JavaScript Object Notation) has become a universal standard for data exchange due to its simplicity, lightweight format, and language-independent nature. Python, with its easy syntax and powerful libraries, provides excellent support for working with JSON files. This guide will delve into the practical aspects of performing CRUD (Create, Read, Update, Delete) operations on JSON files using Python, offering code snippets, examples, and best practices. Python CRUD Operations on JSON Before diving into the CRUD operations, it’s crucial to understand how Python interacts with JSON data. The json module in Python can parse JSON from strings or files. The module…

Hey there! If you’re looking to set up a LAMP stack (that’s Linux, Apache, MySQL, and PHP) for your web projects, using Docker Compose is a super easy and efficient way to do it. In this guide, we’ll walk you through the steps to get your LAMP stack up and running smoothly with Docker Compose. Whether you’re a beginner or just want a hassle-free setup, this article is for you! Let’s dive in and make it happen. Prerequisites Before we dive into the setup process, ensure you have the following installed on your system: Docker: A platform for developing, shipping,…

In the realm of network management and monitoring, Zabbix stands out as a premier open-source solution. It offers a comprehensive suite of features for monitoring network services, servers, and other network hardware. This guide will help you with installing Zabbix Server on CentOS/RHEL 9, a popular choice for enterprise-grade server environments, using a MySQL database backend. Zabbix’s compatibility with CentOS/RHEL 9 ensures stability and performance, making it an excellent choice for robust network monitoring. The tutorial includes steps for setting up a LAMP (Linux, Apache, MySQL, PHP) stack, configuring the Zabbix server, and finalizing the setup through its web interface.…

In the world of software development, managing dates and times is a common yet crucial task. Whether you’re building a project management tool, scheduling events, or tracking deadlines, calculating the difference between two dates is a fundamental need. Java, with its robust set of libraries and classes, offers multiple ways to perform this task with precision and ease. In this article, we’ll explore how to master time manipulation by calculating the number of days between two dates in Java, providing practical examples to guide you through. Understanding Java’s Date-Time APIs Before diving into the calculations, it’s essential to understand the…

In web development, it’s important to know how to work with dates and times. JavaScript, a popular programming language for websites, has tools that make it easy to calculate and work with dates. One common task is finding out how many days are between two dates. This guide will show you how to do that using JavaScript, which is useful for things like booking systems, event timelines, or any feature where you need to compare dates. Understanding Date Objects in JavaScript Before we learn how to calculate the number of days between two dates, it’s important to understand what a…

In programming, JSON (JavaScript Object Notation) is a popular way to share data. It’s simple and flexible, making it a top choice for things like web services and setting up programs. Python, known for its comprehensive set of tools and straightforward language, works really well with JSON. This guide will show you how to easily work with JSON data in Python, helping you manage data more smoothly and effectively. Python Program to Load JSON File Below is a concise example program demonstrating how to load JSON data from a file in Python, followed by a detailed explanation of each part…