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…
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 a private LAN to the…
tmpfs delivers exceptional I/O performance since it lives entirely in RAM. Exporting it via NFS can be useful for temporary caches, build artifacts, or high-speed data sharing between systems on a trusted network. The catch: NFS needs additional configuration to export pseudo-filesystems like /dev/shm. Without the right settings, you’ll hit access denied errors or fsid…
On Fedora/RHEL-based systems: dnf install ecryptfs-utils On Debian/Ubuntu: apt-get install ecryptfs-utils Load the kernel module modprobe ecryptfs To ensure the module loads automatically on boot, add it to /etc/modules-load.d/: echo “ecryptfs” | sudo tee /etc/modules-load.d/ecryptfs.conf Create directories You’ll need two directories: one for encrypted storage (.private) and one as the mount point (private). The .private…
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…
rsync is a reliable choice for backing up your Linux home directory, especially when dealing with large files and incremental changes. Unlike git (which struggles with files >5GB), rsync efficiently handles large files and only transfers what’s changed on subsequent runs. Basic Backup Command The fundamental syntax is straightforward: rsync -avxP \ /path/to/directory/to/backup \ /path/to/directory/for/storing/backup…
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…
sshfs is the standard tool for mounting remote filesystems over SSH. It’s available in most distribution repositories. Debian/Ubuntu: sudo apt install sshfs RHEL/CentOS/Fedora: sudo dnf install sshfs Alpine: apk add sshfs On some systems you may need to ensure the fuse kernel module is loaded: sudo modprobe fuse Basic Mount Mount a remote directory to…
This post analyzes I/O performance between loopback and blktap backends for Xen file-backed virtual block devices (VBDs), based on testing from 2013. While Xen remains in production use (AWS EC2, Citrix Hypervisor), most Linux deployments now default to KVM. For modern virtualization needs, consider KVM/libvirt or container solutions like Docker and Kubernetes. This post is…
Accessing a remote desktop environment on a Linux server securely requires proper tunneling. While SSH X11 forwarding works for single applications, VNC provides a full graphical desktop session. By combining VNC with an SSH tunnel, you encrypt all traffic and can work around firewall restrictions that only allow port 22. Why VNC Over SSH? VNC…
This article documents performance benchmarks for Xen virtualization, comparing CPU and memory performance between Dom0 (privileged domain), DomU (unprivileged guest), and bare metal. While Xen remains in production use (AWS EC2, Citrix Hypervisor, Oracle Cloud), most Linux distributions default to KVM for new deployments. For contemporary virtualization needs, evaluate both Xen and KVM based on…
Git and SSH integrate seamlessly for version control infrastructure. An SSH-based Git server works well for small teams where all members are trusted and have administrator-level access to all repositories. This approach is straightforward to deploy, but lacks fine-grained access control. For teams that need role-based repository access or audit trails, consider dedicated tools like…
Compiz Fusion is a lightweight 3D window manager and compositing system that can replace your standard window manager. While it’s rarely the default choice on modern Fedora installations, it remains available for users who want its visual effects and functionality. Note: Compiz development has slowed significantly. Most Fedora users today use Wayland-based desktops (GNOME, KDE…
DNS lookups can be a bottleneck in Firefox browsing performance. Here are practical methods to optimize DNS resolution and related network behavior. Disable IPv6 (if not needed) If your network doesn’t use IPv6, disabling it can eliminate unnecessary lookup delays. In Firefox, navigate to about:config and set these preferences: network.dns.disableIPv6 → true This prevents Firefox…
The default number of loop devices on most Linux systems is 8, which is often insufficient for scenarios like running multiple virtual machines with loop device-backed storage, containerized environments, or disk image management. If you need more than the default allocation, you’ll need to increase max_loop. First, check your current loop device count: losetup -f…
Xen remains a robust hypervisor for production environments—AWS EC2, Citrix Hypervisor, and many hosting providers still rely on it. However, KVM has become the default for most Linux distributions due to simpler management and better integration with standard tooling. For new deployments on standard Linux, evaluate KVM with libvirt or container solutions like Docker and…
Converting audio tracks from video files is useful for extracting soundtracks, creating audio-only versions for podcasts, or generating files optimized for audio playback. While MPlayer was historically used for this task, ffmpeg is now the standard tool—it’s actively maintained, more efficient, and handles both extraction and encoding in one step. Installation Install ffmpeg on your…
Free virtualization on Linux has multiple solid options. While VMware Player is still available, QEMU combined with libvirt has become the standard approach for most sysadmins. This guide covers creating VM disk images and configurations that work across multiple hypervisors. Creating Virtual Disk Images The first step is creating a virtual disk. QEMU’s qemu-img tool…
After running on MediaWiki, we migrated back to WordPress. Both platforms have their strengths, but WordPress proved to be the better fit for our site’s goals. What WordPress Does Better for This Site Plugin Ecosystem and Content Discovery WordPress’s plugin landscape is significantly deeper than MediaWiki’s. The YARPP (Yet Another Related Posts) plugin and its…
Andrew Fikes, Principal Engineer at Google, presented on storage architecture and the fundamental challenges that emerge when operating at scale. The presentation from the 2010 Faculty Summit remains relevant for understanding how distributed storage systems must be designed and the trade-offs inherent in large-scale deployments. Core Storage Challenges at Scale Google’s storage systems had to…