By default, libvirt stores VM images as files in /var/lib/libvirt/images/. While functional, this approach limits flexibility. LVM (Logical Volume Management) provides better control over disk space, snapshots, and performance tuning. Using LVM volumes as libvirt storage pools lets you manage VM storage like block devices rather than files, giving you faster provisioning, atomic snapshots, and…
sbt (Scala Build Tool) isn’t available in the default Fedora repositories, though Scala itself is. Here’s how to install it properly. Using the Official Repository The most reliable approach is to add sbt’s official repository to your system. This gives you automatic updates and avoids manual RPM downloads. Create the repository configuration file: sudo tee…
Counting page views isn’t as simple as incrementing a counter. You need to handle edge cases: duplicate views from the same user, multiple users behind a single IP (corporate networks), and bots. Here’s how to build a robust system. The Problem with IP-Based Counting Relying on IP addresses fails in several scenarios: Multiple users behind…
You can delete cookies from individual sites without clearing your entire browser cache. Here’s how: Via Settings UI Open chrome://settings/privacy in the address bar (or go to Settings > Privacy and security) Click Cookies and other site data Click All cookies and site data Use the search box to find the domain you want to…
If you’ve deactivated and reactivated the Disqus WordPress plugin but it’s still using the old forum ID and configuration, you need to clear the stored settings from your database. This is the most reliable way to force the plugin to re-initialize and prompt you for fresh configuration. Why This Happens WordPress stores plugin configuration in…
Broken links damage SEO, hurt user experience, and undermine site credibility. Checking for them should be part of your regular maintenance routine. Here’s what’s available in 2026. Online Tools W3C Link Checker (http://validator.w3.org/checklink) remains a solid option for checking individual pages. Point it at a URL and it crawls the page’s links, reporting broken ones…
Redis is an in-memory data structure store designed for speed and simplicity. Understanding its architecture and consistency guarantees is essential for deploying it correctly in production systems. Core Architecture Redis operates as a single-threaded, event-driven server that uses an in-memory data store with optional persistence. The single-threaded nature simplifies reasoning about concurrent access — all…
Install the required LAMP stack components. Fedora 41 and later use dnf instead of yum: sudo dnf install httpd php php-mysqli php-gd mariadb-server Note that php-mysql is deprecated; use php-mysqli instead for modern MySQL/MariaDB connections. Start and enable the services to run on boot: sudo systemctl start mariadb httpd sudo systemctl enable mariadb httpd Using…
Facebook’s engineering team has long been vocal about their heavy reliance on MySQL to power one of the world’s largest platforms. Understanding their approach offers valuable insights for anyone managing databases at scale. Storage Engine Philosophy Facebook treats MySQL as a generic data manipulation and storage engine rather than a monolithic application database. This architectural…
Chrome on iOS implements aggressive caching to improve browsing performance, but this can prevent you from seeing the latest versions of pages, stylesheets, and scripts. Unlike Safari’s convenient long-press refresh button, Chrome’s cache management is less intuitive. The Nuclear Option: Clear All Cache The most straightforward approach is clearing all cached data: Open Chrome Tap…
Facebook operates two distinct caching systems, each designed for different access patterns and consistency requirements. Memcache serves as a lookaside cache where the intelligence resides primarily on the client side. This architecture means applications are responsible for cache invalidation, consistency checks, and determining what data to cache. Memcache is stateless and horizontally scalable, making it…
Question2Answer’s RSS feed configuration includes a toggle for “Include full text in feeds” but offers no built-in option to display excerpts instead of full content. If you need excerpt functionality, you’ll need to modify the feed generation code. This approach works with Question2Answer 1.5.4+. The method involves creating a custom feed handler that truncates content…
If you use both the Chrome RSS Subscription Extension and Feedly, you can integrate them so that clicking the RSS icon in your browser automatically opens your feed in Feedly instead of the browser’s default handler. Understanding the Integration When you subscribe to an RSS feed through the Chrome extension, it needs a target URL…
If you’re running Question2Answer and want to replace the default search with Google Custom Search without modifying your theme, a plugin is the cleanest approach. Setup Requirements Before implementing Google Custom Search, you’ll need: A Google account Google Custom Search Engine (CSE) created at cse.google.com Your CSE ID (cx parameter) Question2Answer 1.8+ installed and functioning…
If you’re working with Mingle Forum and need to remove canonical links from forum pages while preserving them elsewhere, you’ll need to locate the specific code in your theme’s class file. Finding the Code Reference The line numbers (like -1260) in a diff refer to specific locations within the file being modified. In this case,…
The Question2Answer (Q2A) Share plugin enables social sharing functionality for questions and answers on your Q2A installation. This guide covers installation and configuration. Installation First, download the plugin from the official repository: cd /path/to/your/q2a/qa-plugins git clone https://github.com/NoahY/q2a-share.git q2a-share Alternatively, download the ZIP file from GitHub and extract it directly into your qa-plugins directory. The directory…
In many WordPress themes, the sidebar loads before the main content area in the HTML source. This affects SEO and accessibility, since search engines and screen readers process content in source order. Moving the main content div before the sidebar in HTML while keeping the visual layout intact improves your site’s structure. The Problem A…
Question2Answer supports third-party authentication through social login plugins. Here’s how to set up Sina Weibo and Tencent QQ login integration. Prerequisites You’ll need: A Question2Answer installation (v1.8.x or later) Admin access to your Q2A instance Developer accounts and API credentials from both platforms Getting API Credentials Sina Weibo: Register as a developer at https://open.weibo.com/ Create…
WordPress’s default block editor works fine for most users, but if you’re comfortable with Markdown—especially for code-heavy technical posts—you’ll want a solid setup that doesn’t corrupt existing content or create maintenance headaches. The key requirement: your solution must preserve Markdown in the database and render it on demand, rather than converting it to HTML and…
Working in an SVN repository often leaves behind temporary build artifacts, compiled outputs, and editor cache files. Unlike Git’s git clean command, SVN has no built-in cleanup mechanism for untracked files. Using svn st to Identify Untracked Files The svn status command (or svn st) marks untracked files with a ? prefix. You can leverage…