aclocal is part of GNU Autotools and generates aclocal.m4 files needed by the autoconf build system. It’s typically required when working with projects that use traditional Autotools-based builds. Quick Install sudo dnf install automake The automake package provides aclocal, automake, and related utilities. Verify the Installation After installation, confirm aclocal is available: aclocal –version You…
Error handling is fundamental to Go development. Often you’ll need to convert an error to a string for logging, displaying to users, or including in API responses. Go provides several straightforward approaches. Using the Error() Method Every error in Go implements the error interface, which has a single method: Error() string. The simplest conversion is…
The YARN resource scheduler determines how cluster resources are allocated to jobs. By default, Hadoop uses the Capacity Scheduler, but you can switch to an alternative like the Fair Scheduler or configure different scheduling policies. Identifying Your Current Scheduler Check which scheduler is currently active by examining your configuration: grep -A 2 “yarn.resourcemanager.scheduler.class” $HADOOP_HOME/etc/hadoop/yarn-site.xml The…
RealVNC’s free tier is limited to personal use and restricts advanced features, making it unsuitable for many production or semi-commercial scenarios. If you need a fully-functional open-source alternative, several solid options exist. TightVNC TightVNC remains a reliable choice for Windows VNC hosting. It’s GPL-licensed, fully open-source, and includes both server and client components. Installation: Download…
The TP-LINK T2U is a USB WiFi adapter based on the MediaTek MT7650U chipset. While Linux kernel support has improved significantly, you may still need to manually compile drivers on some distributions. This guide covers installation on modern Fedora and RHEL-based systems. Check if your adapter is already supported First, plug in the adapter and…
The free command—along with ps, top, kill, pgrep, and dozens of other system utilities—is maintained as part of the procps-ng project. Source repository The source code is hosted at: https://gitlab.com/procps-ng/procps You can clone it with: git clone https://gitlab.com/procps-ng/procps.git cd procps Most distributions package procps-ng, so you likely already have it installed. You can verify the…
YouCompleteMe’s installation script fails on Fedora with a CMake error about missing PYTHON_LIBRARIES and PYTHON_INCLUDE_DIRS, even when Python is already installed. The error looks like this: CMake Error at /usr/share/cmake/Modules/FindPythonLibs.cmake:201 Could NOT find PythonLibs (missing: PYTHON_LIBRARIES PYTHON_INCLUDE_DIRS) The issue is that you have the Python runtime libraries installed but not the development headers needed for…
Xen hypervisor command line options are kernel parameters passed during boot that control how the Xen hypervisor initializes and operates. These affect CPU scheduling, memory management, virtualization features, debugging, and more. Finding Xen Command Line Options The official documentation is the authoritative source for Xen hypervisor parameters. For your installed Xen version, consult: Official Xen…
VirtualBox on Fedora reports “The vboxdrv kernel module is not loaded” when you try to launch it, even though the virtualbox and kernel module packages are installed. This typically happens on systems with UEFI Secure Boot enabled, which requires kernel modules to be cryptographically signed. Check if the module is loaded First, verify whether the…
[md] Systemd’s coredump handler captures process crash dumps by default, which can consume significant disk space on development or test systems. Here’s how to disable or control coredump storage. ## Quick Solution Edit /etc/systemd/coredump.conf and set: [Coredump] Storage=none Then reload the systemd daemon: systemctl daemon-reload This prevents coredumps from being stored permanently while still logging…
Securing your website with HTTPS is no longer optional—it’s essential for SEO, user trust, and browser compatibility. The good news: Let’s Encrypt provides free certificates, and the tooling has matured significantly. Using Certbot with Nginx or Apache The standard approach is Certbot, which automates certificate issuance and renewal: sudo certbot –nginx This automatically configures HTTPS…
Chrome on iOS has a fundamental limitation: it cannot accept self-signed SSL certificates or custom Certificate Authorities (CAs) because iOS restricts all browsers to use the system’s certificate validation. Unlike desktop Chrome, you cannot bypass this through browser settings. Why This Limitation Exists iOS enforces strict security policies where all apps—including Chrome, Safari, and Firefox—must…
If you need to scan documents on Windows, several solid open-source options exist. Here are the most practical choices. NAPS2 (Not Another PDF Scanner 2) NAPS2 remains the top recommendation for Windows scanning. It’s straightforward, actively maintained, and handles most scanner hardware without headaches. What it does: Scans from WIA and TWAIN-compatible scanners Saves to…
GNU Screen is a terminal multiplexer that lets you manage multiple shell sessions within a single window. If you’re new to it, here are the best resources to get up to speed, plus practical tips for getting started. Getting Started with Screen For an introduction to the basics, start with A quick tutorial on screen….
[md] vbetool is a utility for executing real-mode x86 BIOS calls, commonly used for power management and display mode switching on legacy systems. Rocky Linux 9 doesn’t include it in standard repositories, so you’ll need to build it from source. ## What vbetool Does vbetool communicates with the video BIOS through the Video BIOS Extensions…
MPlayer has been largely superseded by mpv in most Linux distributions, but if you need the classic MPlayer with DVD navigation support, building from source remains the way to get libdvdnav integrated. Most distribution packages omit this feature due to licensing complexity. Prerequisites You’ll need a C compiler, build tools, and development libraries. On Fedora/RHEL-based…
HDFS snapshots provide a way to create read-only point-in-time copies of the filesystem or specific directories without duplicating data. Understanding their design helps you implement efficient backup strategies and recover from accidental deletions in production clusters. How HDFS Snapshots Work Snapshots in HDFS use copy-on-write semantics to avoid duplicating data. When you create a snapshot,…
GitBook is a tool for building documentation and ebooks from Markdown content. Here’s how to set it up on a Linux system. Prerequisites You’ll need Node.js installed first. On Ubuntu/Debian: curl -fsSL https://deb.nodesource.com/setup_20.x | sudo -E bash – sudo apt-get install -y nodejs On Fedora/RHEL: sudo dnf install nodejs Verify the installation: node –version npm…
Node.js installation on Ubuntu and Linux Mint has evolved significantly. The approach depends on your use case — whether you need the latest stable version, multiple Node versions for different projects, or just a quick setup. Using the NodeSource Repository (Recommended) The NodeSource repository provides current, well-maintained Node.js packages. This is the best approach for…
Node.js is available on Fedora through the DNF package manager and several alternative methods. Here’s how to install it using each approach. Method 1: DNF (System Package Manager) The simplest method — install Node.js directly from Fedora’s repositories: sudo dnf install nodejs npm Check the installed version: node –version npm –version Fedora’s repositories typically include…