Linux

• Postfix Queue Stuck: The Safe Cleanup Workflow (No Data Loss)
• WordPress Update Failed: Fix Permissions, Disk Space, and Ownership the Right Way
• Docker + TLS: Let’s Encrypt inside/outside containers — pick the safe pattern
• WordPress 404 on Posts: Fix Permalinks Without Breaking SEO
• MySQL vs MongoDB: the “NoSQL because trendy” mistake that kills VPS performance
• ZFS Capacity Planning: Designing for Growth Without Rebuilding
• Docker AppArmor and seccomp: the minimum hardening that matters
• ZFS Special Small Blocks: How to Turbocharge Small-File Workloads
• Docker Multi-Host Without Kubernetes: Real Options and Hard Limits
• ZFS hot-swap strategy: How to Replace Disks Without Panic
• MySQL vs Aurora MySQL: “managed” doesn’t mean “faster”—what changes for real
• ZFS pools: Why ‘Partitions Thinking’ Makes Your Design Bad
• ZFS DDT Sizing: Predicting RAM Needs Before Enabling Dedup
• MySQL vs SQLite Backups: Who’s Easier to Recover Under Pressure
• Ubuntu 24.04: VLANs don’t work — the one bridge flag most people forget
• ZFS vdevs: The Rule You Break Once and Regret Forever
• PostgreSQL vs Percona Server performance myths: why “it’s faster” depends on workload
• Ubuntu 24.04: Performance tank after update — the first 6 checks that reveal the culprit
• Ubuntu 24.04: PHP upload limits — fix upload_max_filesize where it actually matters (case #10)
• Docker Env Var Precedence: Why Your Config Is Never What You Think
• PostgreSQL vs ClickHouse: ETL patterns that don’t create data chaos
• Proxmox LXC backup/restore failures: tar errors, permissions, and filesystem gotchas
• Docker CIFS volumes are slow: the truth (and better alternatives)
• Code-Friendly Tables: Fixed vs Auto Layout, Wrapping, and Numeric Alignment
• ZFS Adding Disks: The ‘Add VDEV’ Trap That Creates Imbalance
• Docker Container Timeouts: Tune Retries the Right Way (Not Infinite)
• WordPress High TTFB: Speed Up Server Response Without Magic Plugins
• MariaDB vs PostgreSQL Indexing: Why “Best Practices” Backfire on Real Workloads
• Postfix Open Relay Risk: Test It, Prove It, Close It
• WordPress admin-ajax.php 400/403: What Blocks AJAX and How to Fix It
• Proxmox VLAN Not Working: Trunk Ports, Linux Bridge Tagging, and “No Network” Fixes
• PostgreSQL vs SQLite: Reliability vs Simplicity—What Fails First
• ZFS RAIDZ rebuild math: Why One More Failure Can Kill You
• Debian 13: MySQL slow query log — find the query that’s silently killing you
• Proxmox Ceph PG Stuck/Inactive: What to Do Before Data Risk Escalates
• ZFS zpool status: Reading Health Like a Forensics Analyst
• Proxmox SSL certificate broke: fast ways to restore Web UI access safely
• Email Quarantine & Spam Folder Policies: Stop Losing Important Messages
• Docker Container Keeps Restarting: Find the Real Reason in 5 Minutes
• Ubuntu 24.04: Resolv.conf Keeps Changing — Fix systemd-resolved/NetworkManager Properly
• OpenVPN: Set It Up Correctly (and Why It’s Often Slower Than WireGuard)
• DNS: Your DNS “works” but apps still fail — the caching layers you forgot exist
• Proxmox GPU Passthrough Black Screen: 10 Causes and Fixes
• Debian 13 Dual NIC Routing: Stop Asymmetric Routes and Random Drops (Case #53)
• DNS Slow Lookups on Linux: Fix systemd-resolved the Right Way
• WordPress “You are being redirected”: stopping SSL and cookie redirect loops
• Debian/Ubuntu: “Works on LAN, fails on WAN” — routing/NAT checks that reveal the cause (case #85)
• MariaDB vs PostgreSQL: CPU spikes—who burns cores faster under peak load
• Proxmox firewall locked you out: restore SSH/Web UI from console without panic
• ZFS Write Hole Explained: Who Has It and Why ZFS Avoids It