Introduction Docker has revolutionized the world of software development and deployment by providing a lightweight and efficient containerization platform. With Docker, developers can package their applications and dependencies into containers, making it easier to deploy and run them consistently across different environments. In this article, we will guide you through the process of installing Docker on CentOS and RHEL 8/7 and provide examples of basic container manipulation. Installing Docker on CentOS/RHEL 8 Preparing the System Before installing Docker, ensure that your system is up to date by running the following commands − $ sudo yum update $ sudo yum install ... Read More

Introduction CentOS 7 is a popular Linux distribution known for its stability and security. If you're looking to set up a web server on CentOS 7, you'll likely need to install Apache, MySQL or MariaDB, and PHP. In this comprehensive guide, we will walk you through the installation process of these components, along with examples and their outputs, to ensure a successful setup. Prerequisites Before we begin, make sure you have the following prerequisites in place − CentOS 7 installed on your server or virtual machine. Root access or sudo privileges to execute commands with administrative rights. Update the System ... Read More

Introduction DNS (Domain Name System) plays a crucial role in translating domain names into IP addresses, allowing users to access websites using human-readable URLs. To enhance DNS performance and reduce network latency, implementing a caching-only DNS server can significantly improve the speed and efficiency of DNS lookups. In this article, we will guide you through the process of installing and configuring a caching-only DNS server in RHEL/CentOS 7. Prerequisites Before proceeding, ensure that you have the following − A server running RHEL/CentOS 7. Root or sudo access to the server. Basic knowledge of the Linux command line. Update ... Read More

Introduction Adobe Flash Player has been a widely used multimedia platform for many years, enabling users to view interactive content, play online games, and stream videos. However, with the rise of HTML5 and the continuous evolution of web standards, Flash Player has been gradually phased out and is no longer officially supported by Adobe. Nevertheless, some legacy systems and applications may still require Flash Player 11.2 to function properly. In this article, we will guide you through the process of installing Adobe Flash Player 11.2 on CentOS/RHEL 7/6 and Fedora 25-20. Prerequisites Before proceeding with the installation, ensure that you ... Read More

Introduction Email communication remains an integral part of our personal and professional lives. Setting up a reliable and secure mail server is crucial for efficient communication within organizations or for personal use. RedMail, a fully-featured mail server solution, offers a comprehensive suite of tools to create virtual domains, access webmail, and enhance email security with SpamAssassin and ClamAV. In this article, we will guide you through the process of installing RedMail on a Linux system, showcasing examples and their outputs to help you get started. Prerequisites Before we dive into the installation process, make sure you have a Linux server ... Read More

Introduction Setting up a server is an essential step in creating a reliable and secure environment for hosting websites, applications, or managing data. In this article, we will explore the process of setting up an Ubuntu server, specifically versions 20.04, 18.04, and 16.04. We will cover the necessary steps, along with practical examples and their corresponding outputs, to help you navigate through the initial server setup process seamlessly. Prerequisites Before diving into the server setup, ensure that you have the following prerequisites in place − An Ubuntu 20.04, 18.04, or 16.04 server instance. A user account with administrative privileges (or ... Read More

Red Hat Enterprise Linux (RHEL) is a Linux-based operating system from Red Hat designed for businesses. This article is a practical guide on how to carry out the initial server setup and configurations on RHEL 7. In this tutorial, we will walk you through the essential first steps to prepare a RHEL 7 server for use. Section 1: Logging in as Root After your server boots, you will be able to log in as the root user. The root user is the administrative user in a Linux environment with very broad privileges. Example − ssh root@your_server_ip Section 2: Creating ... Read More

Introduction The burgeoning field of technology constantly introduces innovations designed to boost efficiency, speed, and productivity in diverse arenas, among which data management holds paramount importance. The traditional disc-based databases have played a significant role in data management for years. However, with data volumes escalating exponentially, businesses worldwide are looking for ways to expedite data processing. In this scenario, in-memory databases (IMDBs) stand as a revolutionary alternative. Understanding In-Memory Databases An in-memory database (IMDB) is a database management system that primarily relies on main memory (RAM) for data storage rather than traditional disk storage. This storage scheme empowers IMDBs to ... Read More

Linux has built-in support for two types of Mandatory Access Control (MAC) systems: SELinux and AppArmor. Both systems add an additional layer of access control to the default Discretionary Access Control (DAC) that comes with Linux. In this article, we delve into the implementation of both systems, offering practical examples and their respective outputs. Understanding SELinux and AppArmor SELinux, short for Security-Enhanced Linux, is a Linux kernel security module that provides a mechanism for supporting access control security policies. It is a highly flexible MAC system that assigns labels to every object in the system (files, directories, ports, etc.) and ... Read More

Introduction System monitoring is an essential aspect of Linux administration, as it gives a clear overview of system resources usage, and the performances of various processes and applications running on a Linux system. Several tools provide this functionality, but Htop stands out due to its superior features and user-friendly interface. Htop is an interactive process viewer and system monitor that supersedes the older 'top' utility found in most Linux distributions. Htop offers a real−time, color−coded, and graphical representation of the processes running on a system, with CPU, memory, and swap usage displayed at the top. In this article, we delve ... Read More