Checking Firmware Version in Linux The firmware (BIOS/UEFI) on your system contains critical hardware settings and boot information. Knowing your firmware version is essential for updates, compatibility checks, and troubleshooting. Here’s how to find it. Using dmidecode dmidecode is the standard tool for reading the Desktop Management Interface (DMI) table, which stores hardware and firmware…
Historical Context and Modern Alternatives This post covers Xen virtualization benchmarks from 2013. While Xen remains in production use (AWS EC2, Citrix Hypervisor), KVM has become the default hypervisor for most Linux distributions. For current production environments, evaluate KVM with libvirt, direct container solutions (Docker, Kubernetes), or cloud-native platforms. This post is preserved for historical…
Setting Up Xen Dom0 on Fedora Xen remains a production-grade hypervisor used in enterprise environments (AWS EC2, Citrix Hypervisor), though KVM has become the default for most Linux distributions. This guide covers building a stable Xen Dom0 on current Fedora releases using modern kernel sources. Hardware Considerations This guide assumes server-class hardware with: Intel or…
GNOME Easter Eggs: “free the fish” and “gegls from outer space” GNOME includes a couple of built-in easter eggs that are worth knowing about, though their availability varies across versions. “free the fish” This easter egg displays a random wisdom phrase (pulled from the fortune database) in a dialog box. Modern GNOME (40+): Open the…
Creating Fedora Live USB Media A Fedora Live USB lets you boot directly into a Fedora environment without modifying your hard drive. You can use it to test Fedora, troubleshoot your system, or perform a fresh installation. This guide covers modern tools and workflows for creating bootable USB media. Back up any data on your…
Xen Dom0 Installation on Fedora: Common Issues and Solutions Xen remains relevant in production environments (AWS EC2, Citrix Hypervisor), though KVM has become the default for most Linux distributions. This guide covers frequent installation and configuration issues specific to Fedora Dom0 setups, with many tips applicable to other Linux platforms. BIOS Configuration If Xen fails…
Xen Virtualization on Linux: Dom0 and DomU Setup Xen remains a critical hypervisor in production environments—AWS EC2, Citrix Hypervisor, and other cloud platforms rely on it—but most Linux distributions now default to KVM for general-purpose virtualization. If you’re working with Xen specifically, this guide covers Dom0 and DomU setup on modern distributions. When to Use…
Listing Available Package Versions To find all available versions of a package in your repository, use the –showduplicates flag: dnf list –showduplicates kernel Or for other packages: dnf list –showduplicates <package-name> The output shows both installed and available versions with their release tags. For example: Installed Packages kernel.x86_64 6.8.1-1.fc39 @updates Available Packages kernel.x86_64 6.7.12-200.fc39 updates…
Finding Linux Network Configuration Information Linux provides multiple ways to query network configuration. While the underlying concepts remain consistent, modern tools have evolved from the older net-tools utilities. IP Address, MAC Address, and Netmask The modern replacement for ifconfig is ip addr: $ ip addr show This displays all network interfaces with their IPv4 and…
Xen DomU on Modern Linux Systems Xen remains production-grade virtualization for specific use cases (AWS EC2, Citrix Hypervisor), but most Linux distributions default to KVM. This guide covers Xen DomU setup using modern tools and practices. For new deployments, evaluate KVM/libvirt or container solutions like Podman/Kubernetes first. Storage Setup Create a file-backed virtual block device…
GTK Cursor Consistency in KDE Plasma When using KDE Plasma with GTK applications, you’ll notice the mouse cursor switches to a default style when moving from the desktop to applications like Firefox or GIMP. This happens because GTK and Qt use separate cursor theme configurations by default. Quick Fix The easiest solution is to explicitly…
Historical context This post documents jailbreaking procedures for legacy iOS devices (iPod Touch, early iPhone) using Spirit—an untethered jailbreak tool from the late 2000s. Modern iOS devices (2010 and later) use entirely different security models and jailbreak methods. This information is preserved for historical reference only and has no practical application to current iOS versions….
Starting KDE from Command Line with startx If you prefer booting to a minimal environment and starting your desktop manually, you can configure startx to launch KDE Plasma instead of your default desktop environment. Understanding startx and Desktop Selection The startx command reads configuration files to determine which desktop environment to start. On systemd-based distributions…
Disabling the NVIDIA Logo During Boot Modern Linux distributions typically auto-detect and load NVIDIA drivers without requiring manual xorg.conf configuration. However, if you’re using an older setup with an explicitly configured xorg.conf file, or if you need to customize NVIDIA driver behavior, you can disable the NVIDIA logo that displays during X server startup. Modern…
Setting Date, Time, and Timezone in Linux Understanding and managing system time is crucial for logging, cron jobs, SSL certificates, and system synchronization. Here’s how to handle it properly on modern Linux systems. Unix Time (POSIX Time) Unix time represents seconds elapsed since 00:00:00 UTC on January 1, 1970, excluding leap seconds. Get the current…
MAC Spoofing in Linux MAC stands for Media Access Control — a six-byte identifier (usually written as twelve hexadecimal digits) that uniquely identifies a network interface on a LAN. The Address Resolution Protocol (ARP) maps IP addresses to MAC addresses at layer 2. You might need to change your MAC address to: Bypass network access…
Modern Video Manipulation with FFmpeg and mpv MPlayer and mencoder are obsolete. FFmpeg and mpv (the actively maintained fork of MPlayer) are the standard tools for video manipulation on Linux systems today. While some MPlayer syntax still works in mpv, FFmpeg is more performant, better documented, and handles modern codecs reliably. This guide covers practical…
Excluding Packages from DNF/YUM Updates You may need to prevent certain packages from being updated during system maintenance—the kernel on production servers, or specific library versions you’ve carefully tuned. When you run dnf update or yum update, you want those packages skipped entirely. The solution is straightforward: add an exclusion to DNF or YUM’s configuration…
Linux Port Forwarding Using iptables Port forwarding allows external hosts to reach services inside a private network by mapping traffic from a public address to an internal one. On Linux, this is implemented through iptables rules that modify packet headers as they traverse the kernel’s netfilter framework. Common use cases include exposing HTTP/HTTPS servers from…
Automating LaTeX Compilation with Make Compiling LaTeX documents with BibTeX involves multiple passes—typically three runs of latex followed by one bibtex run to resolve citations. This sequence is identical across most documents, making it perfect for automation with a Makefile. Basic Makefile Template Here’s a practical Makefile for LaTeX with BibTeX support: FILENAME = main…