Linux

• ZFS glossary: VDEV, TXG, ARC, SPA—Everything You Pretended to Know
• ZFS using SATA SSD as SLOG: The Cheap Upgrade That Often Fails
• WordPress “Destination folder already exists”: fix installs without a wp-content mess
• Debian 13: Fix “Too many redirects” in Nginx by correcting canonical and HTTPS loops (case #71)
• Debian/Ubuntu Web Root Permissions: Stop 403s Without 777 (Case #69)
• Debian 13: Disk writeback storms — tune vm.dirty settings without data risk (case #45)
• Proxmox ZFS “pool is not healthy”: what to do before it gets worse
• Email: Mailbox full — prevent it and recover cleanly when it happens
• ZFS volblocksize Migration: Why You Usually Must Recreate the ZVOL
• Email TLS-RPT: Get visibility into TLS failures (and fix them)
• Ubuntu 24.04: Certbot renews but your app still fails — fix permissions and reload hooks
• Ubuntu 24.04: CIFS mount says “Permission denied” — the exact options that fix it
• ZFS Recordsize Migration: Changing Strategy Without Rewriting Everything
• Debian 13 Stuck in initramfs: What It Really Means and How to Get Your System Back
• Office VPN + VLAN: connect segments safely without flattening the network
• Debian 13: Your server won’t boot after updates — the clean GRUB rollback that actually works
• ZFS sync: The Setting That Can Make You Fast… and Unsafe
• Local DNS for VPN Users: Stop DNS Leaks and Split Routing Failures
• ZFS Refreservation: Guaranteeing Space Without Breaking Apps
• Proxmox pvedaemon.service Failed: Why Tasks Don’t Run and How to Fix It
• DNS load spikes: rate-limit and survive attacks without downtime
• Proxmox Windows VM Can’t See the Disk: Install VirtIO Drivers Correctly
• Proxmox ZFS “cannot import pool”: root causes, checks, and recovery options
• Docker: DNS inside containers is broken — systemd-resolved fixes that stick
• Email Greylisting: When It Helps and When It Just Delays Real Mail
• Docker “OCI runtime create failed”: decode it and fix the real cause
• MySQL vs OpenSearch for Self-Hosted Search: Worth It or Self-Harm on a VPS?
• ZFS Bookmarks: Saving Incrementals When Something Goes Wrong
• Ubuntu 24.04 “Temporary failure in name resolution”: stop guessing and fix DNS the right way
• Office VPN + RDP: Secure Remote Desktop Without Exposing RDP to the Internet
• Docker Port Published but Unreachable: The Real Checklist (Not Guesswork)
• Proxmox Backup Server vs Veeam for VMware: what’s better for fast restores and simple ops
• Ubuntu 24.04 Disk Hangs Under Load: Timeout Settings That Prevent Full Stalls (Case #30)
• MySQL vs Percona Server: safer defaults—less tuning, fewer outages
• ZFS Kernel Upgrade Survival: What to Check Before Reboot
• ZFS autotrim: Keeping SSD Pools Fast Over Time
• ZFS IOPS vs Throughput: Stop Reading the Wrong Metric
• Ubuntu 24.04 “grub rescue>”: Get Back to a Booting System with the Least Damage
• ZFS zfs release: How to Actually Remove “Undeletable” Snapshots
• Office VPN + Printers: Stable Cross-Site Printing Without Random Failures
• Docker Postgres Container Pitfalls: Data Loss Scenarios and How to Avoid Them
• WordPress “Briefly unavailable for scheduled maintenance”: why it sticks and how to fix it
• Docker Restart Policies: Stop Creating Infinite Crash Loops
• WireGuard DNS Not Working Through VPN: Correct DNS Setup on Linux and Windows
• WordPress “max_input_vars”: Why Menus and Forms Break, and How to Fix It
• DNS: MTU Issues Can Break DNS — How to Prove It and Fix It
• ZFS Incremental Send: Backups That Don’t Recopy Everything
• MySQL vs PostgreSQL backups in containers: how to avoid fake backups
• ZFS for Media Files: Big Records, Big Compression, Big Wins
• Ubuntu 24.04: Memory ballooning surprises — set sane limits and stop swap storms (case #76)