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Articles by Satish Kumar
Page 35 of 94
20 Useful Commands of 'Sysstat' Utilities for Linux Performance Monitoring
In the world of Linux system administration, performance monitoring is a critical task for maintaining optimal system health. The Sysstat utilities are among the most powerful and widely-used tools for this purpose. This comprehensive collection provides detailed insights into CPU utilization, memory usage, disk activity, network statistics, and much more. In this article, we will explore 20 essential commands from the Sysstat utilities suite that every Linux administrator should master for effective performance monitoring. Installation of Sysstat Utilities Before exploring the commands, you'll need to install the Sysstat package. While most modern Linux distributions include it by ...
Read MoreHow to Enable HTTP2.0 in Nginx?
HTTP/2 is the latest version of the HTTP protocol, designed to improve website performance and security. Nginx is a popular web server that supports HTTP/2. If you're using Nginx and want to enable HTTP/2 for your website, this article will guide you through the process. Prerequisites Before enabling HTTP/2, ensure your system meets these requirements: Nginx version 1.9.5 or later OpenSSL 1.0.2 or later for ALPN support Valid SSL/TLS certificate Step 1: Check Nginx Version First, verify your Nginx version supports HTTP/2: nginx -v If your version is older ...
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 MoreCheck if Hard Drive is SSD or HDD on Linux
To determine whether our file system uses SSD or HDD technology, we need to identify which type of storage device is used by our Linux system. Understanding storage hardware helps optimize performance and make informed decisions about data placement. There are many different aspects of Linux storage with numerous tools available for reading and configuring storage devices. We use terms like "drive", "volume", and "mount point" to describe hard drives, optical discs, and USB sticks. To understand the underlying technology, we focus on two key aspects − What physical disk or block device we are examining (using ...
Read More20 Useful IPtable Firewall Rules Every Linux Administrator Should Know
As a Linux administrator, one of the most important aspects of maintaining a secure and stable network is implementing an effective firewall. IPtables is a powerful firewall tool that comes pre-installed on most Linux distributions. In this article, we will explore 20 useful IPtables firewall rules that every Linux administrator should know. These rules will help you secure your network and prevent unauthorized access, while also allowing legitimate traffic to pass through. Block All Incoming Traffic Except SSH The first rule is to block all incoming traffic except for SSH. SSH is a secure way to access your ...
Read MoreHow To Enable HTTPS for Varnish Cache using Hitch on CentOS/RHEL 8?
In today's world of internet security, enabling HTTPS on your website is crucial to ensure the privacy and safety of your users' data. One way to achieve this is by using Varnish Cache and Hitch, a lightweight TLS proxy, to offload SSL/TLS processing from Varnish. In this article, we will guide you through the process of enabling HTTPS for Varnish Cache using Hitch on CentOS/RHEL 8. Prerequisites Before we begin, ensure that you have the following − A CentOS/RHEL 8 server Root access to the server Varnish Cache and Hitch installed A valid SSL/TLS certificate ...
Read MoreHow to Find Files in Linux With the Find Command?
The find command is one of the most powerful and essential tools in Linux for locating files and directories within the filesystem. Unlike simple search utilities, the find command allows you to search based on various criteria such as file name, size, permissions, modification time, and even content. It recursively searches through directory hierarchies, making it invaluable for system administration and file management tasks. The find command works by traversing directories starting from a specified path and evaluating each file and directory against the given search criteria. Its flexibility lies in its ability to combine multiple search conditions and ...
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 MoreFind the Java SDK location on Linux
Finding the Java SDK location on Linux is a common task for developers who need to configure environment variables, set up IDEs, or manage multiple Java versions. This article demonstrates several reliable methods to locate your Java Development Kit (JDK) installation directory using built-in Linux commands. Understanding Java Installations on Linux On Linux systems, Java can be installed in various locations depending on the installation method and distribution. Common locations include /usr/lib/jvm/, /usr/java/, or /opt/java/. Additionally, many systems support multiple Java versions simultaneously, making it important to identify which version is currently active. Method 1: Using update-java-alternatives ...
Read More20 Useful PKG Command Examples to Manage Packages in FreeBSD
FreeBSD is a free and open-source Unix-like operating system based on Berkeley Software Distribution (BSD) system. It is widely used by developers, system administrators, and users who are looking for a reliable and secure operating system. One of the main features of FreeBSD is its package management system, which allows users to easily install, update, and remove software packages using the pkg command. Basic Package Management Commands 1. Installing Packages To install a package in FreeBSD, use the pkg install command followed by the package name − pkg install apache24 2. Updating All ...
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