- 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
- MySQL vs PostgreSQL: PITR drills—test restore before you need it
- Docker “invalid reference format” — the typo that wastes hours (and the fix)
- Windows IKEv2 Disconnects: Common Errors and Reliable Fixes
- Docker Vulnerability Scanning: What to Trust and What Is Noise
- MySQL vs PostgreSQL: “random timeouts”—network, DNS, and pooling culprits
- MariaDB vs Percona Server: performance tweaks—what’s real and what’s marketing
- ZFS HDD-only Pool Tuning: Getting Speed Without SSDs
- Email: Phishing from Your Domain — an Incident Response Playbook That Works
- DMARC fails: choose a policy without breaking legitimate mail
- Debian 13: New interface name broke networking — stable naming fixes that survive reboots (case #67)
- Debian 13 MTU/MSS Mismatch: Why Large Files Stall and How to Fix It Cleanly
- MySQL vs Elasticsearch for Ecommerce Search: Why SQL Collapses Under Filters
- MySQL vs PostgreSQL Full-Text Search: When Built-In Is Enough and When It’s a Trap
- Docker Multi-Stage Builds: Shrink Images Without Breaking Runtime
- Email headers: Read “Received” properly — trace where delivery breaks
- Email Blacklisted IP/Domain: How to Verify and Get Delisted the Right Way
- Docker Containers Filling Disk: tmp/log/cache Cleanup That Won’t Burn You