Linux

• ZFS copies=2/3: Extra Redundancy Without a New VDEV—Smart or Waste?
• CSS-Only Modals That Don’t Betray You: :target, Backdrops, and Close Patterns
• Debian 13: SSH port changed — fix firewall + sshd order without locking yourself out (case #27)
• Dark mode that doesn’t suck: prefers-color-scheme + manual toggle pattern
• PostgreSQL vs ClickHouse: where to store the firehose logs without pain
• Debian/Ubuntu Web Root Permissions: Stop 403s Without Making Everything 777 (Case #9)
• A modern CSS reset for 2026: minimal, safe for forms and media
• MySQL vs MongoDB for Reporting and Analytics: Why Teams Crawl Back to SQL
• Email SPF fails: the 5 record mistakes that break delivery (and fixes)
• Ubuntu 24.04: Web server suddenly shows 502/504 — the real reason (and how to fix it fast)
• DNS Monitoring: Alert Before Users Notice (Simple, Effective Checks)
• ZFS Snapshots: The Retention Policy That Prevents ‘Snapshot Hell’ Forever
• ZFS zpool clear: When Clearing Errors Is Correct (and When It’s Stupid)
• Debian 13: Network doesn’t come up after reboot — a no-fluff systemd-networkd checklist
• MariaDB vs RDS MariaDB: Who Gets Fewer Weird Compatibility Surprises?
• MySQL vs MariaDB on a 2GB RAM VPS: Tuning Profiles That Don’t Crash
• Ubuntu 24.04 Kernel Parameter Tuning: the 5 sysctls that matter (and the 10 that don’t) (case #42)
• Email Domain Warm-up: A Practical Plan to Avoid Instant Spam Flags
• Docs Callouts That Don’t Betray You: CSS Variables, Dark Mode, and Operational Discipline
• PostgreSQL vs OpenSearch: the hybrid search setup that actually works
• Docker “Too Many Requests” When Pulling Images: Fix Registry Throttling Like You Mean It
• ZFS on Root: Installing So Rollbacks Actually Work
• DNSSEC Fails Randomly: Debugging Validation Errors Without Panic
• Proxmox Clustering and HA: How It Works, What Breaks, and How to Design It Properly
• Hub-and-spoke WireGuard VPN for 3 offices with role-based access
• Tag chips and filter bars: overflow handling, wrap, scroll, selected states
• DMARC Reports: How to Read Them and Catch Spoofing Early
• Email “421 too many connections”: tune concurrency without delaying mail
• Debian 13: nftables rules “don’t work” — load order and conflicts, fixed for good
• ZFS compression lz4: When It’s ‘Free’ and When It Isn’t
• Debian 13: PostgreSQL connection storms — pooler vs tuning: what actually works (case #37)
• Proxmox LXC Won’t Start: Reading cgroups and AppArmor Errors Like a SRE
• DNS Changes Not Visible: Which Caches to Flush (and Which Not to Touch)
• Micro UI Components for Tech Posts: kbd, Badges, Tags, Inline Code, and Copy Buttons
• ZFS NFS: The Tunables That Make It Feel Like Local Disk
• Scroll progress bar for articles: CSS-first, minimal JS that won’t page-fault your UX
• Email: TTL during migration — the simple trick that prevents downtime
• WireGuard Hub-and-Spoke for 3 Offices Through a Central Gateway
• MySQL vs PostgreSQL: “It Suddenly Got Slow”—a 15-Minute Diagnosis Plan for Both
• Proxmox Stuck Tasks: How to Clean Up Hung Jobs and Processes Safely
• Debian 13 Swapfile Pitfalls: Create It Right (Permissions, fstab, Priority)
• Proxmox “Login Failed” When the Web UI Loads: Top Causes and Fixes
• ZFS SLOG power-loss protection: The Feature Your SSD Must Have
• Ubuntu 24.04: UFW locked you out — recover SSH access safely from console
• NTP Across Offices: the Small Thing That Breaks AD, VPN, and Certificates
• MySQL vs PostgreSQL: JSON workloads—fast shortcut or long-term pain
• ZFS SMB: Fixing “Windows Copy Is Slow” for Real
• Docker: Backups You Never Tested — How to Run a Restore Drill Properly
• ZFS ECC vs non-ECC: Risk Math for Real Deployments
• Proxmox “cannot allocate memory”: ballooning, overcommit, and how to tune it