Flushing DNS Cache on Linux DNS caching helps reduce lookups but sometimes you need to clear it after DNS changes, certificate updates, or to troubleshoot resolution issues. Modern Linux with systemd-resolved Most contemporary Linux distributions use systemd-resolved as the default DNS resolver. Flush the cache with: sudo systemctl restart systemd-resolved Or use the resolvectl command:…
Remote Desktop Access via VNC Through SSH Tunnel 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…
Duplicating Xen DomU Virtual Machines Xen remains in active production use—particularly in cloud infrastructure like AWS EC2 and Citrix Hypervisor—though KVM has become the standard hypervisor for most Linux distributions. If you’re managing legacy Xen deployments, this guide covers the essential steps for cloning VBD-based DomU instances. Prerequisites Before starting, ensure: The source VM is…
WordPress Desktop Clients in 2026 Desktop clients for WordPress have largely fallen out of favor in recent years, but they still serve a niche purpose for users who prefer offline writing and batch publishing. Lekhonee was one such tool — a GNOME-based WordPress client that provided a lightweight alternative to the web interface. Important context:…
Chinese Subtitles in mpv MPlayer is largely unmaintained; mpv is the actively developed fork that replaced it. Most MPlayer subtitle commands work in mpv with minor syntax adjustments. This guide covers both. External Subtitle Files Handling Character Encoding Chinese subtitle files often display as garbage when the player guesses the encoding wrong. Specify the correct…
Removing ^M Carriage Returns in Vim When you open a Windows file in Vim (or Neovim), you’ll often see ^M characters at the end of lines. These are carriage returns (\r) from Windows line endings (CRLF), which don’t display properly on Unix-like systems that expect LF-only line endings. Quick Fix The fastest way to remove…
在 Fedora 中配置中文字体 Fedora 中文字体的显示一直是个常见问题，特别是在英文环境中。通过合理的字体配置，可以获得清晰舒适的中文显示效果。本文介绍的方案使用开源字体，这些字体在 Fedora 的标准仓库中都可以获得。 快速配置 如果你只想快速完成配置，运行以下命令： sudo dnf install cjkuni-ukai-fonts cjkuni-uming-fonts sudo wget https://raw.githubusercontent.com/zma/config_files/master/others/local.conf \ -O /etc/fonts/local.conf sudo fc-cache -vf 完成后重启应用或重新登录系统。 安装中文字体 在现代 Fedora 中，安装中文字体包非常简单： sudo dnf install cjkuni-ukai-fonts cjkuni-uming-fonts 这两个包提供的是 AR PL UMing 和 AR PL UKai 字体家族，效果清晰，特别适合显示器阅读。 安装完成后，更新字体缓存： sudo fc-cache -vf 配置字体优先级 字体配置文件应该放在 /etc/fonts/local.conf（系统级，需要 root 权限）或 ~/.config/fontconfig/fonts.conf（用户级）。 用户级配置创建 ~/.config/fontconfig/fonts.conf： <?xml…
Basic Git Server Setup Over SSH 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…
NVIDIA Driver Installation on Fedora Installing NVIDIA drivers on Fedora is straightforward when using RPM Fusion repositories. This guide covers modern Fedora releases (39+) using DNF package management. Prerequisites Before starting, determine which driver your GPU requires. Check the NVIDIA driver download page or use this command to identify your GPU: lspci | grep -i…
Creating ISO Images from DVD Disks on Linux ISO images are sector-by-sector copies of optical media stored as binary files. They’re useful for archiving DVDs or creating portable copies without keeping physical disks around. On Linux, several tools can accomplish this—dd is the simplest, but modern alternatives offer better features. Using dd to Create an…
Compiz-fusion on Fedora 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…
Speeding Up Firefox DNS Lookup in Linux 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…
Increasing Loop Devices in Linux 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…
Create and Manage Virtual Machines on Xen 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…
NetworkManager Configuration for sMobileNet (HKUST) To connect to HKUST’s sMobileNet wireless network via NetworkManager, you’ll need to configure WPA2 Enterprise authentication with PEAP. This guide covers the required settings. Network Settings Configure the following parameters in NetworkManager: Basic Settings: SSID: sMobileNet Wireless security: WPA & WPA2 Enterprise Authentication method: Protected EAP (PEAP) Authentication Details: Anonymous…
Chinese Character Configuration on Modern Fedora Configuring proper Chinese character rendering in Fedora requires attention to font selection and system settings. This guide covers configuration for contemporary Fedora/RHEL systems where you run an English locale but need reliable Chinese character display. Font Selection You have several solid open-source options for Chinese fonts. Each has different…
Desktop Customization on Modern Linux Customizing your desktop environment to match macOS aesthetics remains popular on Linux, though the approach differs significantly from GNOME 2 era configurations. Modern desktop environments like GNOME (40+) and KDE Plasma (5/6) use different theming systems, but achieving an Apple-inspired look is still straightforward. Current Desktop Environment Options GNOME 40+…
Converting Movie Files to Audio Using ffmpeg 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…
Creating and Running Virtual Machines with QEMU and Disk Images 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…
GNOME Desktop Configuration with dconf Modern GNOME uses dconf as its configuration backend, replacing the older GConf system. Whether you’re managing a single workstation or deploying across multiple systems, understanding dconf and gsettings is essential for customizing GNOME environments efficiently. Understanding the Configuration Stack GNOME’s configuration hierarchy works like this: dconf — the low-level database…