Linux

• MySQL vs MariaDB Replication Failover: What Breaks in Real Life (and How to Avoid It)
• TGP in Laptops: The Number Brands Love to Bury
• Debian 13: “Unit masked” surprises — unmask safely and fix why it got masked (case #47)
• Email “Sender address rejected”: authentication and policy fixes
• ZFS ARC: How ZFS Uses RAM (and Why ‘Free RAM’ Is a Myth)
• Ubuntu 24.04 Boots to a Black Screen or Boot Loop: 6 Fixes That Usually Solve It
• MariaDB vs Percona Server: Drop-in Replacement or Compatibility Trap?
• WordPress Malware Suspicion: Signs, Verification, and a Cleanup Plan
• ZFS L2ARC on NVMe: When It’s Worth It (and When ARC Is Enough)
• Email DANE: When It’s Worth It (and Why It Often Isn’t)
• ZFS arcstat: The Fastest Way to See if Cache Helps
• WireGuard full mesh: when direct office-to-office tunnels are worth it (and when not)
• Ubuntu 24.04 “No route to host”: ARP/gateway/ACL checklist that ends the guessing (case #32)
• WordPress File Permissions Errors: What 755/644 Should Be and Why
• ZFS dnodes and Metadata: Why Metadata Can Be Your Real Bottleneck
• Docker CPU at 100%: Find the Noisy Container and Cap It Properly
• ZFS Missing Device Paths: Using by-id and WWN Like an Adult
• ZFS vs Hardware RAID: Who Protects You When the Controller Lies?
• OpenVPN AUTH_FAILED: why correct credentials still fail (and what to check)
• PostgreSQL vs Percona Server: debugging slowdowns—who gives better visibility
• Overlapping Subnets Between Offices: 3 Working Solutions Without a Rebuild
• Do 8 Cores Still Cover Everyone in 2026? The Honest Answer
• Email Forwarding Breaks DMARC — Fix It with SRS (and Other Options)
• ZFS Resilver Priority: Rebuild Fast Without Killing Production IO
• Docker “too many open files”: raising limits the right way (systemd + container)
• Fix Proxmox “IOMMU not enabled” for PCI Passthrough (VT-d/AMD-Vi) Safely
• MySQL vs PostgreSQL Backups and Restores: Who Gets You Back Online Faster
• ZFS Property Inheritance: The Surprise That Changes Child Datasets
• ZFS ashift: The Silent Misalignment That Cuts Performance in Half
• Debian 13: NTP Works but Drift Persists — Hardware Clock and Chrony Tweaks (Case #79)
• Office VPN access control: allow only what’s needed (not full LAN-to-LAN)
• Ubuntu 24.04: SSH hardening that won’t lock you out — a pragmatic checklist
• Debian 13: NFS is slower than expected — prove it’s sync/rsize/wsize and fix it (case #23)
• WireGuard vs IPsec for Offices: What’s Easier to Maintain and Common Traps
• Dockerfile “failed to solve”: the errors you can fix instantly
• Form Styling That Survives Production: Inputs, Selects, Checkboxes, Radios, Switches
• ESXi to Proxmox V2V Conversion: Best Methods and Pitfalls
• Callout Blocks with Icons: Inline SVG + CSS Variables (No Icon Fonts)
• ZFS zpool events: The Log You Ignore Until It Saves You
• ESXi to Proxmox Storage Migration: Moving VMFS Datastores to ZFS, NFS, or iSCSI with Minimal Downtime
• Debian 13: “Filesystem full” broke your DB — the recovery steps that actually work (case #59)
• VPN Connected but No Internet on Windows: Routes and Metrics Checklist
• Fix WordPress MySQL “Server Has Gone Away” and “Too Many Connections”
• Email SMTP 4xx Temporary Failures: Top Causes and Fixes That Actually Work
• WordPress Search Is Slow: Speed It Up Without Expensive Services
• Debian 13: SSH is slow to log in — DNS and GSSAPI fixes that speed it up instantly (case #5)
• Debian 13: ZRAM/Zswap — when it saves your box and when it backfires
• ZFS SSD-Only Pool Tuning: Avoiding Garbage Collection Collapse
• Docker “No route to host” from containers: routing and iptables fixes that stick
• ZFS Module Versions: Keeping Kernel and ZFS From Fighting