Xen remains a production hypervisor used by AWS EC2, Citrix Hypervisor, and other cloud providers, though most general-purpose Linux distributions have shifted toward KVM as their default. If you’re working with Xen in production or developing drivers, understanding its source code layout is essential. Top-Level Directory Structure The Xen source repository (hosted on xenbits.xen.org) is…
LVM snapshots provide a fast, efficient way to duplicate virtual machines across servers. This technique applies to any LVM-backed hypervisor including Xen, KVM, and Proxmox. The process uses LVM snapshots on the source server, then transfers the snapshot image to the destination using standard Unix tools. Scenario Source server: 10.0.0.10 with VM stored in /dev/vg_xen/vm-10.0.0.123…
Building and maintaining Linux clusters requires coordinated management of user accounts, storage, networking, and services across multiple machines. This guide covers practical approaches to common clustering challenges, from unified authentication to network isolation. Account and Storage Management Unified Authentication and Home Directories Centralizing user management across cluster nodes eliminates the overhead of maintaining individual user…
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 This post is preserved for historical reference and understanding legacy Xen…
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 AMD processor with virtualization extensions (VT-x…
GNOME has hidden a few playful easter eggs in its desktop environment over the years. Two of the most well-known are “Free the Fish” and “Wanda the Fish” — small animated features that surprise unsuspecting users. Free the Fish (GNOME 2) In GNOME 2, pressing Alt+F2 and running this command: free the fish releases a…
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 with “I/O virtualization disabled,” you need to enable virtualization…
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 Xen Xen is worth considering if you need:…
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 IPv6 addresses, MAC addresses, and…
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 (VBD) for your DomU. File-backed storage…
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 configure GTK to use your chosen…
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 Approach (Wayland/Systemd) On current distros using…
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 Unix timestamp: $ date +%s 1735689600 This…
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 file. Configuration Syntax Add this…
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 LATEX = pdflatex BIBTEX =…
This guide documents theme configuration for GNOME 2 and early KDE environments. If you’re running GNOME 40+, KDE Plasma 5, or later, refer to your desktop’s modern theming systems instead—most of these packages and configuration methods no longer apply. Historical Context The Shiki Colors theme paired with GNOME Colors icons represented a popular approach to…
Xen remains a production hypervisor for enterprise deployments (AWS EC2, Citrix Hypervisor), though KVM has become the default for most Linux distributions. If you’re deploying Xen in 2026, you’ll likely be working with recent stable releases rather than the legacy versions covered in older guides. This guide covers building a modern Xen Dom0 environment on…
Firefox performance on Linux can be significantly improved through configuration tuning. Most of these settings apply across platforms, though this guide focuses on Linux-specific considerations. Network Pipelining HTTP pipelining allows Firefox to send multiple requests on a single connection before waiting for responses. Modern HTTP/2 and HTTP/3 handle multiplexing more efficiently, but pipelining can still…
ffmpeg is the de facto tool for desktop recording on Linux. It can capture your X11 or Wayland display and encode directly to MP4, WebM, or other formats without requiring intermediate files. Basic X11 Screen Capture For X11-based desktops (KDE Plasma, XFCE, i3, etc.), use the x11grab input device: ffmpeg -f x11grab -s 1920×1080 -r…
The mailx (or s-nail on modern distributions) command remains useful for scripted email delivery, particularly when you need to send alerts or notifications automatically. Gmail’s SMTP service works well for this, though it requires TLS authentication and specific configuration. Prerequisites Most Linux distributions include mailx or s-nail by default. On systems using s-nail (Ubuntu 20.04+,…