In my journey with RPM-based Linux distributions, I’ve encountered numerous scenarios where understanding the contents of an RPM package became essential. Whether it’s for troubleshooting issues or gaining insights into system modifications, exploring RPM packages has been a valuable skill. Let me share with you my comprehensive guide on listing files within RPM packages. Getting …
DevOps
In the realm of Linux system security, controlling which applications can execute is a critical aspect of maintaining a secure environment. fapolicyd is a powerful tool designed for Red Hat Enterprise Linux (RHEL) that allows administrators to define and enforce policies governing application execution. This article delves into the capabilities of fapolicyd, its components, and …
DNS (Domain Name System) is the phonebook of the internet, translating human-readable domain names (like google.com) into machine-readable IP addresses. When DNS malfunctions, you might experience issues like websites not loading or displaying incorrect content. Here’s a guide to efficiently troubleshoot DNS issues on Linux systems: 1. Case One: DNS Resolution Failure Problem Description: Some …
Definition of Bash Scripting A bash script is a text file containing a sequence of commands designed to be executed by the bash program, which is a Unix/Linux shell. These commands are processed line by line, allowing for the automation of tasks such as navigating to a specific directory, creating a folder, or launching a …
understanding for loop in Bash The for loop is a fundamental programming construct to execute a series of commands repeatedly for a predefined set of values or elements. With the for loop, Bash scripts can efficiently iterate over lists, arrays, file contents, or numerical ranges, making it a powerful tool for automation and repetitive tasks. …
In Bash, exit codes (also known as return codes or status codes) are numeric values returned by executed commands or scripts to indicate the result of their execution. These exit codes are often used to determine the success or failure of a command or script, allowing other parts of a program or script to make …
When you encounter a “GPG check FAILED” error while trying to install an RPM package with yum, it typically means that the GPG signature of the package does not validate against the known public keys on your system. This can be due to missing keys, or issues with the repository configuration. Keys imported using rpm –import are …
The HostnameMismatchError is an exception that occurs in Python when there is a mismatch between the hostname specified in the URL you are trying to access and the hostname provided by the SSL certificate of the server you are connecting to. This error is typically raised by the requests library or when using ssl.wrap_socket with …
Introduction Imagine your computer as a castle, and SSH as the special key to enter it safely. But just like in any adventure, there are secrets to making your castle extra secure. So get ready to explore, because we’re about to reveal some tricks that will make your castle unbreakable! Change the Default SSH Port …
SSH, or Secure Shell, is a cryptographic network protocol that provides a secure channel for data exchange between a client and a server. It is widely used for remote login and other secure network services. In this comprehensive guide, we will delve into the fundamentals of SSH, explore its configuration and advanced techniques, discuss security …