Introduction Firewalld is a dynamic firewall management tool that is included in CentOS 7. It replaces the previous iptables service as the default firewall tool for CentOS 7. Firewalld is designed to make it easier to manage firewall rules and provide more flexibility in defining policies and rulesets. The primary purpose of Firewalld on CentOS 7 is to protect your system from unauthorized access by blocking inbound traffic that does not match specific rules or policies. It also allows you to define different network zones with different levels of security based on the level of trust you have ... Read More

Introduction NetworkManager is a daemon that manages the network connections on Red Hat Enterprise Linux (RHEL) and its community-based counterpart, CentOS. It handles both wired and wireless connections, including ethernet, WiFi, mobile broadband, VPNs, and other network interfaces. The daemon provides a graphical user interface for managing network settings on desktop environments such as GNOME or KDE. NetworkManager is designed to automatically detect and configure connections based on the available network devices and their properties. It uses a variety of mechanisms to connect to networks dynamically, including DHCP (Dynamic Host Configuration Protocol), PPP (Point-to-Point Protocol), static IP addresses, etc. Additionally, ... Read More

In today's digital age, internet connectivity plays a crucial role in our day-to-day lives. In order to connect to the internet, we need an address that identifies us on the network. This is where IP addresses come into play. IPv4 (Internet Protocol version 4) is the fourth version of IP addresses and has been used for many years. However, as technology advances and more devices connect to the internet, the number of available IPv4 addresses is running out. That's why IPv6 was introduced. Explanation of What IPv6 Is and Why Someone May Want to Disable It IPv6 (Internet Protocol version ... Read More

In today's modern world, the utilization of the Internet is essential for many businesses and individuals alike. The Internet Protocol (IP) is a fundamental communication protocol that is used to connect devices over the internet. Internet Protocol Version 6 (IPv6) was introduced in 1998 as an improvement over IPv4 and has since become more widely adopted. Explanation of what IPv6 is and why someone may want to disable it IPv6 provides several advantages over its predecessor, including a larger address space, improved security, and better network performance. However, there are situations where disabling IPv6 may be necessary. For example, some ... Read More

Introduction When it comes to system security, it is essential to restrict root access as much as possible, especially when multiple users have access to the system. One of the ways a user can gain root access is by invoking the “su” command. While the su command allows a user to switch from one user account to another, it can be misused or abused by users with sudo privileges. In this article, we will explain what “su” access for sudo users means, why it's important to disable "su" access for sudo users and how you can do this. ... Read More

Introduction Linux is an open-source operating system that is widely used by developers, system administrators, and individuals who prefer a non-proprietary operating system. A Linux distribution, often simply called a "distro, " is a customized version of the Linux operating system that includes different software packages and configurations to fit specific needs. There are hundreds of Linux distributions available, ranging from popular ones like Ubuntu and Fedora to specialized ones like Kali Linux for cybersecurity professionals. Planning Your Distribution Identifying your goals and target audience Before starting, it is essential to identify your goals and target audience. What do you ... Read More

Introduction One of the most important components of a functioning operating system is the boot process. Notably, it is also one of the most complex and essential processes in any operating system. Linux-based operating systems can encounter issues during this process that prevent them from starting up properly. Such issues can be frustrating and even disheartening for users who rely on their Linux systems for work, school or personal use. There are multiple causes for boot issues in Linux, including hardware problems, software misconfiguration or corruption, and even user errors. These issues can manifest themselves in many ways: ... Read More

Introduction Red Hat Enterprise Virtualization, or RHEV, is a virtualization platform developed by Red Hat Inc. that provides an open-source infrastructure for hosting virtualized workloads. It allows users to easily deploy virtual machines on top of a set of physical hosts, known as hypervisors. The RHEV environment consists of two main components: the management platform, which manages the entire infrastructure through a web-based interface called RHEV Manager; and the hypervisor hosts that run the virtual machines. Preparing for Virtual Machine Deployment System Requirements Before deploying virtual machines in a RHEV environment, it is important to ensure that your system meets ... Read More

Introduction RedHat Enterprise Virtualization Hypervisor (RHEV-H) is a virtualization platform that provides an end-to-end, high-performance, and scalable solution to meet the needs of modern data centers. RHEV-H is based on the open-source Kernel-based Virtual Machine (KVM) hypervisor, which allows for hardware-based virtualization, enabling multiple operating systems to run on a single physical machine. With RHEV-H, organizations can create an infrastructure that is easier to manage and more cost-effective. Preparing for Deployment System requirements for RHEV-H deployment Before deploying RedHat Enterprise Virtualization Hypervisor (RHEV-H), it is important to ensure that the system meets the minimum hardware and software requirements. The following ... Read More

Introduction NGINX is a popular open-source web server that also functions as a reverse proxy, load balancer, and HTTP cache. A reverse proxy is a server that sits in front of web servers and forwards client requests to the appropriate backend server. The benefits of using NGINX reverse proxy include improved security, scalability, and performance. By acting as an intermediary between clients and servers, NGINX can also provide additional features such as caching, SSL termination, and content compression. In this article, we will discuss how to deploy NGINX reverse proxy on Docker – a platform that allows developers to easily ... Read More