Linux

• Debian 13: NTP Works but Drift Persists — Hardware Clock and Chrony Tweaks (Case #19)
• ZFS Power Loss Testing: How to Validate Safety Without Losing Data
• Ubuntu 24.04 OOM killer: prove it, fix it, prevent repeats
• ZFS Read Errors: When It’s the Disk, the Cable, or the Controller
• Docker “Cannot connect to the Docker daemon”: fixes that actually work
• Docker: Keep Containers from Booting on Updates — Pin Images Responsibly
• Email “550 rejected”: what it actually means and how to get unblocked
• ZFS Master Roadmap: From First Pool to Production Without Regret
• Docker logs are exploding: fix log rotation before your host dies
• ZFS Replacing Multiple Disks: The Safe Order That Prevents Failure
• Tailscale: VPN Without Pain, and the Access Mistakes That Still Hurt
• ZFS zfs send: The Fastest Way to Move Terabytes (If You Do It Right)
• OpenVPN on Windows: TAP Driver Problems and How to Repair Them
• WordPress “Memory exhausted”: raise memory limits the right way (where it matters)
• HDMI Cable Roulette: Identical Outside, Different Inside
• Debian 13: SSH is slow to log in — DNS and GSSAPI fixes that speed it up instantly (case #65)
• Two offices on 192.168.0.0/24: connect them without renumbering
• MySQL vs SQLite: Migration Signs—Exactly When It’s Time to Upgrade
• Ubuntu 24.04: Certificates renew but Nginx still serves the old one — why and how to fix
• MySQL vs MariaDB: Kubernetes readiness—probes, restarts, and data safety
• Office VPN File Sharing: Stable SMB Between Offices Without Constant Disconnects
• PostgreSQL vs RDS PostgreSQL: performance tuning you still must do (even managed)
• Nginx for WordPress: Config Mistakes That Cause 5xx Errors (and Fixes)
• Debian 13 SATA Link Resets: Prove It’s the Cable or Backplane, Not Linux
• ZFS RAID Controller Passthrough: IT Mode vs HBA vs “Fake HBA”
• ZFS Latency Monitoring: The Graphs That Catch Disaster Early
• PostgreSQL vs Redis: how to stop cache stampedes from melting your DB
• Responsive Tables for Technical Docs That Don’t Break in Production
• Debian 13: /etc/pve looks empty after reboot — why mounts fail and how to recover
• Debian 13: Package pinning saved my server — how to use apt preferences without chaos
• Docker macvlan: Can’t Reach the Container — Fix the Classic Routing Trap
• Proxmox Ceph Slow Ops: Locate the Bottleneck (Disk, Network, or CPU)
• MySQL vs PostgreSQL: “CPU 100%”—how to prove it’s queries, not hardware
• Postfix SASL auth fails: the config gotchas and the fix order
• Print Styles for Docs That Don’t Embarrass You
• WordPress Domain Migration Without Losing SEO: 301s, Canonicals, Sitemaps, and Zero Drama
• MariaDB vs SQLite Backups: Simple Restore vs Real PITR
• Proxmox “Can’t Remove Node”: Safe Node Removal From a Cluster
• GitHub-Style Code Blocks: Title Bars, Copy Buttons, Line Numbers, and Highlighted Lines
• Rspamd False Positives: Tune Spam Scoring Without Letting Junk Through
• Proxmox VMs Have No Internet: vmbr0 Bridge Mistakes and Quick Fixes
• MySQL vs MariaDB: innodb_buffer_pool_size—the copy-paste tuning mistake that kills performance
• rDNS/PTR Missing: The Boring DNS Fix That Saves Email Deliverability
• PostgreSQL vs SQLite Concurrent Writers: Who Wins and Why
• ZFS primarycache: Caching Rules That Stop ARC From Wasting RAM
• Fixing Proxmox PBS “Authentication Failed”: Tokens, Permissions, and Fingerprints
• WordPress Media Library Looks Empty: Database Paths and URL Issues to Check
• MySQL vs Percona Server Monitoring: Find Killer Queries Without Guessing
• OpenVPN “route addition failed” on Windows: routing fixes that actually work
• MariaDB vs TiDB: migration promises vs production reality