Linux

• WordPress 500 Internal Server Error: Most Common Causes and a Fast Fix Plan
• Mega Menu with CSS Grid: Hover, Focus, Mobile, and Accessibility Basics
• ZFS recordsize: The One Setting That Decides 80% of File Performance
• WordPress “Error establishing a database connection”: quick recovery and prevention
• DKIM Selector Mismatch: The 2-Minute Fix
• Fluid Spacing with CSS clamp(): Padding and Margins That Scale Naturally
• Ubuntu 24.04: System Updates Broke Modules — Rebuild initramfs Correctly (Case #88)
• MySQL vs SQLite: the “free speed” case—when a file DB beats a server
• Ubuntu 24.04: When GRO/LRO/TSO Offloads Break Things — How to Test and Disable Safely
• Postfix Rate Limiting: Prevent Abuse Without Blocking Real Users
• Debian 13 Kdump crash capture: set it up and prove it works (case #17)
• ZFS Sequential Resilver: Why Rebuild Speed Isn’t Just “Disk MB/s”
• Proxmox VM won’t start after changing CPU type: recovery steps that work
• Reduced Motion Support: prefers-reduced-motion Done Properly
• MySQL vs MariaDB: WooCommerce checkout lag—one setting fixes it, the other just masks it
• Reverse DNS (PTR): Why Your Email Suffers and How to Fix rDNS Correctly
• Email: TLS cert renewal — keep SMTP/IMAP from breaking on renew day
• Debian 13: Memory leaks in services — find them with the least disruption (case #43)
• ZFS encryption: Strong Security Without Killing Performance
• Custom checkboxes and radios with pure CSS: accessible patterns that don’t lie
• MySQL vs PostgreSQL on a 1GB RAM VPS: What’s Actually Usable (and the Settings That Make It)
• Docker volumes: Bind mounts vs named volumes — what survives migrations better
• ZFS ACL Mapping for SMB: Avoiding Permission Nightmares
• MariaDB vs PostgreSQL on an 8GB VPS: How to Scale Clients Safely
• Email “Recipient address rejected”: why valid users still bounce
• Fix Proxmox apt update Failures: DNS, Repos, and GPG Keys (Step-by-Step)
• WordPress “Invalid JSON response”: causes and fixes that actually work
• Docker “volume is in use”: remove or replace without data loss
• Rspamd first-time setup: the minimal config that actually works
• ZFS vdev imbalance: Why One Slow VDEV Drags the Whole Pool
• MariaDB vs PostgreSQL on a VPS: Tuning for Speed per Dollar
• MySQL vs Redis: Write-through vs Cache-aside—What Breaks Less in Real Apps
• WordPress 504 Gateway Timeout: Is It the Database or PHP? How to Prove Which One
• WordPress Database Bloated: wp_options Autoload Cleanup Without Breaking Things
• Ubuntu 24.04 servers: Snap vs apt — where Snap quietly causes pain (and what to do)
• ZFS Mirrors: The Layout That Makes Random IO Feel Like NVMe
• Email: Brute force on IMAP/SMTP — lock it down without locking yourself out
• DNS REFUSED Responses: ACLs and Policies That Block You (and How to Correct Them)
• Proxmox systemd “Dependency failed”: Find the Service That Breaks Boot
• Debian 13: nf_conntrack table full — why connections fail and how to tune safely
• ZFS “No Space Left” Lies: Fixing Space Without Random Deletes
• Proxmox NFS timeouts: mount options that improve stability
• Proxmox vs ESXi for ZFS: choosing the right disk controller path (HBA passthrough vs virtual disks)
• MySQL vs Percona Server: performance under spikes—what changes in practice
• Docker Rate Limiting and WAF in Front of Containers Without Blocking Real Users
• Printers Across Offices: Fix “I Can See It But It Won’t Print” Over VPN
• ZFS Special VDEV: The Feature That Makes Metadata Fly (and Can Kill the Pool)
• ZFS vs mdadm: Where mdraid Wins and Where It Loses
• WordPress blocked by WAF: tune rules without opening security holes
• Card grids that auto-fit columns with auto-fit/minmax (no media queries)