Linux

• 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
• ZFS dRAID: Faster Resilver—Or Just Faster Complexity?
• WordPress 429 Too Many Requests: bots, rate limits, Cloudflare — how to fix
• Migrate ESXi VM to Proxmox Without vCenter: OVF/OVA Export, Import, and Driver Fixes
• Proxmox Linux VM Slow Disk: Controller + Cache Choices That Fix Stutter
• Proxmox HA “cannot start resource”: finding the real blocker (quorum, storage, network)
• ZFS zfs hold: The Safety Pin That Blocks Accidental Deletion
• Ubuntu 24.04: sudo is slow — DNS/hostname fixes that remove the delay (case #6)
• Debian 13: fio benchmarks lie — how to test storage without fooling yourself
• Proxmox Disks Not Detected: HBA, BIOS, and Cabling Quick Checklist
• MySQL vs PostgreSQL on a 4GB RAM VPS: What to Set First for Websites
• MySQL vs ClickHouse: Stop Analytics from Killing OLTP (The Clean Split Plan)
• Docker Desktop Networking Weirdness: LAN Access, Ports, and DNS Fixes That Actually Work
• Ubuntu 24.04: “Failed to get D-Bus connection” — fix broken sessions and services (case #48)
• ZFS Scrub Slow: How to Tell Normal Slowness From a Real Problem
• Debian 13: Service won’t start after config change — fix it by reading the right log lines (case #1)
• Proxmox “cluster not ready – no quorum?”: restore quorum without making it worse
• Postfix “host not found”: DNS issues that silently kill email
• Ubuntu 24.04: Reboot required… but you can’t reboot — smart ways to plan maintenance
• PostgreSQL vs SQLite: scaling path—how to move from file DB without downtime
• WordPress Duplicate Content Fix: Canonical, Trailing Slash, and WWW Without Cannibalization
• ZFS ARC per TB: RAM Sizing Without Myths and Forum Religion
• Ubuntu 24.04: Reverse path filtering — the hidden setting that breaks multi-homing (case #54)
• ZFS Readonly: The Anti-Ransomware Trick You Can Deploy Today
• Docker Pull Is Painfully Slow: DNS, MTU, and Proxy Fixes That Actually Work
• Docker networks: Bridge vs host vs macvlan — pick the one that won’t bite later
• Debian 13: DNS split-horizon gone wrong — fix internal names without breaking the internet (case #33)
• Proxmox “Permission Denied” in Datacenter: Roles and ACLs Done Right
• MariaDB vs PostgreSQL: Replication vs PITR—What Actually Saves You After Human Error
• DNS TTL Mistakes That Haunt Migrations — How to Set TTL Like a Pro
• Sticky header that hides on scroll: CSS-first approach + minimal JS fallback
• ZFS SATA Link Resets: The Controller/Cable Failure Pattern
• Docker Healthchecks Done Right — Stop Deploying “Green” Failures
• VPN logs that matter: find “won’t connect” causes in MikroTik/Linux logs