Linux

• Office VPN MTU/MSS Issues: Why Large Files Hang (SMB/RDP) and How to Fix It
• ZFS UPS Integration: What a Clean Shutdown Actually Protects
• Ubuntu 24.04: High load but “nothing is using CPU” — the iowait trap and how to confirm it
• DNS “bogus/validation failed”: fixing upstream DNSSEC issues the practical way
• CCTV over VPN: Access Your DVR/NVR Reliably Without Exposing It to the Internet
• Group-Based Access Over One VPN: Accounting, Warehouse, IT, Different Rights
• Integrated graphics: from “office only” to actually useful
• ZFS zpool get feature@*: Reading Your Pool’s Real Capabilities
• MikroTik WireGuard site-to-site: a clean template config for two offices
• Ubuntu 24.04: Stop rebooting to “fix” issues — how to isolate root causes properly (case #60)
• MySQL vs Percona Server: the drop-in upgrade that can save your production
• Proxmox “tap device already exists”: Fix VM Start Network Conflicts Like You Mean It
• Ubuntu 24.04 PostgreSQL autovacuum “mystery slowness”: how to tune it safely
• Ubuntu 24.04: systemd-resolved breaks Docker DNS — fix without disabling everything
• Postfix “Relay access denied”: Fix relaying without creating an open relay
• Proxmox VLAN not working: configure a VLAN-aware bridge correctly
• Email: Mixed DNS records — the typo that kills delivery (and the fix)
• ZFS Using NVMe as L2ARC: When ARC Isn’t Enough
• Proxmox vs VMware ESXi: which hypervisor should you use in 2026?
• ZFS Docker: Dataset Layout That Stops Layer Explosion
• MySQL vs PostgreSQL: read replicas—when they help and when they lie
• ZFS Snapshots: The Superpower That Can Also Fill Your Pool
• Debian 13: AppArmor blocks your service — allow what you need without disabling security
• DNS SERVFAIL from Upstream: How to Prove Your Provider Is the Problem
• Docker: Blue/green on a single host — the simplest approach that works
• ZFS Datasets Per Workload: The Management Trick That Prevents Chaos
• Debian 13: Permission denied on bind mounts — fix UID/GID mapping the clean way (case #41)
• WordPress White Screen of Death (WSOD): 12 checks that actually work
• ZFS Metadata-Only Reads: How Special VDEV Changes the Game
• ZFS Dataset Naming: The Boring Habit That Saves Admin Time
• Proxmox “cluster filesystem not ready”: why it happens and how to fix it
• ZFS Boot Environments: The Upgrade Safety Net Linux Users Ignore
• Docs Layout Without Frameworks: Sticky Sidebar, Content, Right TOC with CSS Grid
• Proxmox “Unable to activate storage”: Diagnose LVM, NFS, and CIFS the right way
• Proxmox Failed After Update: Roll Back Kernel, Fix Boot, and Recover a Broken Node Safely
• Office VPN for CCTV: Access Cameras and NVRs Without Public IPs
• Docker Compose + systemd: Run stacks reliably after reboot (without hacks)
• Image Handling for Fast Sites: Aspect Ratio, Lazy Loading Styles, Blur-Up Placeholders
• Email message size limits: raise them safely without getting abused
• ZFS secondarycache: When L2ARC Should Cache Nothing
• Ubuntu 24.04 “Failed to start …”: the fastest systemd triage workflow (case #2)
• Ubuntu 24.04 Bridge/VLAN for Virtualization: Fix “VM Has No Internet” the Right Way
• ZFS zpool checkpoint: The Emergency Undo Button (With Sharp Edges)
• Docker Build Is Slow: BuildKit Caching That Actually Speeds It Up
• WireGuard VPN: Set Up Your Own Server Without Opening Unnecessary Holes
• ZFS SLOG: When a Log Device Helps, When It’s Useless, When It’s Dangerous
• Debian 13: SSH keys rotated — revoke access cleanly and avoid key sprawl (case #73)
• Proxmox Ceph HEALTH_WARN: Where to Start Troubleshooting Safely
• Polylang/WPML translation issues: why languages mix and how to fix
• MySQL vs MariaDB Backup Wars on a VPS: mysqldump vs Physical Backups