Author: Rahul

I, Rahul Kumar am the founder and chief editor of TecAdmin.net. I am a Red Hat Certified Engineer (RHCE) and working as an IT professional since 2009..

SSH (Secure Shell) keys are a pair of cryptographic keys used to authenticate to an SSH server as an alternative to password-based logins. A key pair consists of a public key, which you can share freely, and a private key, which must be kept secure. The PEM format, standing for Privacy Enhanced Mail, is a widely used format for storing and sending cryptographic keys, certificates, and other data. It is recognizable by its “—–BEGIN CERTIFICATE—–” and “—–END CERTIFICATE—–” headers and footers. Its popularity stems from its compatibility and ease of use across different systems and software. Generate SSH Key in…

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Deploying Angular applications can be streamlined and made more efficient with Docker-Compose. This guide provides a comprehensive overview of how to containerize your Angular application, making your development process more predictable and your deployments more scalable. Whether you’re a seasoned developer or new to Angular and Docker, this guide will help you understand the essentials of running Angular applications with Docker-Compose. Introduction to Docker and Docker-Compose Docker is a set of platform-as-a-service (PaaS) products that use OS-level virtualization to deliver software in packages called containers. Containers are isolated from each other and bundle their own software, libraries, and configuration files;…

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Setting up a Kotlin application environment on Ubuntu involves a series of straightforward steps. Kotlin, a modern programming language that runs on the Java Virtual Machine (JVM), offers a blend of functional and object-oriented programming features. It is interoperable with Java and is known for its concise syntax. In this guide, we’ll cover the essentials of getting your Kotlin development environment ready on an Ubuntu system, including the installation of Java, Kotlin, and a suitable Integrated Development Environment (IDE). Prerequisites Before beginning, ensure you have a working Ubuntu system and administrative privileges (sudo access) to install packages. Step 1: Update…

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In the ever-evolving landscape of software development, managing multiple Software Development Kits (SDKs) can be a daunting task. This is where SDKMAN! steps in, offering a versatile tool that simplifies the process of managing parallel versions of multiple Software Development Kits on most Unix-based systems. This comprehensive guide aims to walk you through the steps of installing and utilizing SDKMAN on Ubuntu 22.04, ensuring a seamless development kit management experience. What is SDKMAN? SDKMAN! is a version manager that provides a convenient way to install, manage, and switch between different versions of software development kits, such as Java, Groovy, Scala,…

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In the world of containerization, Docker has revolutionized the way developers build, ship, and run applications. Docker containers encapsulate all the dependencies required to run an application, making it easy to deploy across different environments consistently. However, managing multiple processes within a single Docker container can be challenging. This is where Supervisor comes into play. What is Supervisor? Supervisor is a client/server system that allows its users to monitor and control a number of processes on UNIX-like operating systems. It is particularly useful for managing complex applications where multiple processes need to run concurrently. Supervisor provides a robust and reliable…

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In the world of containerization, Docker has emerged as the go-to solution for creating, deploying, and running applications by using containers. However, as with any data-driven application, backing up your data is paramount to ensure that you can recover from any unforeseen data loss or corruption. This article will guide you through creating an ultimate shell script that not only backs up Docker volumes regularly but also uploads these backups to Amazon S3 for offsite storage and cleans up old backups to conserve space. Why Backup Docker Volumes? Docker volumes are used to persist data generated by and used by…

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Are you eagerly anticipating the release of Ubuntu 24.04 LTS? Codenamed Noble Numbat, this highly anticipated Long-Term Support (LTS) version is set to make its debut on April 25, 2024. In preparation for this milestone, let’s delve into everything you need to know about downloading and installing Ubuntu 24.04 LTS. Why Ubuntu 24.04 LTS? Ubuntu 24.04 LTS is the latest iteration of the renowned Ubuntu operating system, renowned for its stability, security, and long-term support. As an LTS release, Ubuntu 24.04 will receive essential updates and security patches for an extended period, making it an ideal choice for both personal…

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Deploying .NET Core applications on Linux servers marks a significant shift from the traditional Microsoft-centric deployment platforms. The cross-platform nature of .NET Core allows developers to enjoy the performance, reliability, and security of Linux environments. This guide provides a comprehensive overview of deploying .NET Core applications across various Linux distributions, focusing on using Nginx or Apache as a reverse proxy and securing deployments with SSL. Prerequisites Before diving into the deployment process, ensure you have: A .NET Core application ready for deployment. A Linux server (Ubuntu, CentOS, or any preferred distribution). Basic knowledge of the Linux command line. Step 1:…

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In the evolving landscape of software development and deployment, the combination of .NET Core and Linux has emerged as a powerful duo, offering developers a flexible, high-performance platform for building and running applications. One of the key aspects of deploying .NET Core applications on Linux is leveraging systemd services to ensure that applications run smoothly, start automatically on boot, and restart after failure. This comprehensive guide aims to demystify the process of using systemd services with .NET Core on Linux, covering everything from the basics to more advanced topics. Introduction to Systemd and .NET Core Systemd is the init system…

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Laravel is a robust, feature-rich PHP framework used for creating high-quality web applications. It simplifies tasks like routing, authentication, caching, and sessions, making it a popular choice for developers worldwide. If you are using Ubuntu 22.04 and planning to set up Laravel, this comprehensive guide is all you need. Before we start, make sure that you have administrative access to an Ubuntu 22.04 system. Step 1: System Update Before installing any new packages, it’s recommended to update your Ubuntu system. Open a terminal window and type: sudo apt update sudo apt upgrade Step 2: Install PHP Laravel requires PHP to…

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