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Operating System Articles
Page 153 of 171
How to Deploy RedHat Enterprise Virtualization Hypervisor (RHEV-H)
RedHat Enterprise Virtualization Hypervisor (RHEV-H) is a bare-metal hypervisor based on the open-source Kernel-based Virtual Machine (KVM) technology. It provides hardware-based virtualization that enables multiple operating systems to run efficiently on a single physical server, creating a scalable and cost-effective virtualization infrastructure for modern data centers. System Requirements Before deploying RHEV-H, ensure your system meets these minimum requirements: Processor − 64-bit x86 processor with virtualization extensions (Intel VT or AMD-V) Memory − At least 4 GB of RAM for the hypervisor Storage − Minimum 10 GB disk space for installation Network − Network interface controller supporting ...
Read MoreHow to Disable “su” Access for Sudo Users?
System security requires careful management of root access, especially in multi-user environments. The su command allows users to switch accounts and potentially gain root privileges, which can pose security risks when combined with sudo access. This guide explains how to disable su access for sudo users to enhance system security. Understanding Sudo and Su Commands The sudo command allows authorized users to execute administrative tasks with elevated privileges by entering their own password rather than the root password. It provides controlled, temporary access to root-level functions while maintaining an audit trail of executed commands. The su command ...
Read MoreHow to Disable IPv6 in CentOS 8?
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 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. What is IPv6 and Why Disable It? IPv6 provides several advantages over its predecessor, including a larger address space (128-bit vs 32-bit), improved security features, and better network performance. However, there are situations where disabling IPv6 may be necessary: Some legacy applications ...
Read MoreHow to Disable IPv6 in RHEL, Rocky & AlmaLinux?
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. What is IPv6 and Why Disable It? IPv6 (Internet Protocol version 6) is an updated ...
Read MoreHow to Disable NetworkManager in CentOS/RHEL 8?
NetworkManager is a daemon that manages network connections on Red Hat Enterprise Linux (RHEL) and CentOS systems. 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 mechanisms like DHCP (Dynamic Host Configuration Protocol), PPP (Point-to-Point Protocol), and static IP addresses to connect to networks dynamically. Additionally, it supports advanced features like bonding ...
Read MoreHow to Disable Package Updates Using YUMDNF in RHEL Linux?
YUM/DNF is the package management system used in RHEL (Red Hat Enterprise Linux) and related distributions to install, update, and remove software packages. While keeping packages updated is generally recommended for security and stability, there are specific scenarios where temporarily disabling package updates becomes necessary to maintain system integrity. Why Disable Package Updates Several situations may require disabling package updates temporarily: Critical Applications − Production systems running mission-critical applications that require specific package versions Compatibility Requirements − Legacy software that may break with newer package versions Testing Environments − Development systems where consistent package versions are ...
Read MoreHow to Disable SSH Root Login in Linux?
SSH (Secure Shell) is a critical protocol used to remotely access and manage Linux servers securely. While SSH provides encrypted communication between clients and servers, allowing root login via SSH creates significant security vulnerabilities. The root user has complete system control, making unauthorized root access extremely dangerous for system integrity. This guide demonstrates how to disable SSH root login in Linux systems, reducing attack vectors and implementing security best practices for server administration. Security Risks of SSH Root Login Enabling root login via SSH exposes your system to several critical security threats: Brute Force Attacks ...
Read MoreHow to Disable Suspend and Hibernation Modes In Linux?
Suspend and hibernation modes are power management features in Linux that help conserve battery life and allow quick system recovery. However, there are situations where you might want to disable these features — such as preventing system instability, avoiding unexpected wake-ups on servers, or ensuring continuous operation of critical applications. Suspend mode puts your computer into a low-power state while keeping the session active in RAM. Hibernation mode saves the current system state to disk and completely powers down the machine. Both modes can sometimes cause issues with certain hardware configurations or interfere with system operations. Disabling Suspend ...
Read MoreHow to Disconnect Inactive or Idle SSH Connections in Linux?
Secure Shell (SSH) is a protocol that enables secure communication between two systems. In Linux, SSH is widely used to remotely access and manage servers. However, idle or inactive SSH connections can pose security risks and consume system resources unnecessarily. This article explains how to identify and disconnect such connections to maintain system security and performance. Identifying Inactive or Idle SSH Connections Before disconnecting inactive SSH connections, you must first identify them. Linux provides several commands to list active users, display session information, and monitor connection states. Using the 'who' Command The who command displays currently ...
Read MoreHow to Do Security Auditing of Linux System Using Lynis Tool?
In today's world, where cyber threats and attacks have become more sophisticated and frequent, it is imperative to secure computer systems against malicious activities. A security audit is a systematic evaluation of the security of a computer system or network, which involves identifying potential vulnerabilities and addressing them before they are exploited by attackers. In this article, we will discuss how to perform a security audit on a Linux system using the Lynis tool. What is Security Auditing? Security auditing refers to the process of evaluating the security posture of a computer system or network by examining its ...
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