Linux

• Email: S/MIME and TLS Confusion — What Actually Improves Security
• Ubuntu 24.04 “Permission denied” executing scripts: noexec mounts and how to fix (case #58)
• Proxmox TASK ERROR: Where to Read Logs and Find the Root Cause Fast
• Docker “network not found”: rebuild networks without breaking everything
• MySQL vs MariaDB in Docker: Why “It Worked Locally” Fails in Production
• Build a SaaS Pricing Table That Converts Without Breaking Your Frontend
• Sticky elements without pain: sticky sidebars, headers, and why it breaks
• VPN + RDP/SSH: Remote Access Without Opening Ports to the Internet
• VPN on Ubuntu/Debian: UFW/nftables Mistakes That Lock You Out (and Fixes)
• ZFS vs btrfs: Where btrfs Feels Nice and Where It Hurts
• Docker Build Cache Invalidation: Why Builds Are Slow and How to Speed Them Up
• Docker Compose: Depends_on Lied to You — Proper Readiness Without Hacks
• CSS Grid vs Flexbox: Decision Rules and Layout Recipes That Survive Production
• WordPress Can’t Upload Images: Fast Troubleshooting for Permissions, Limits, and Libraries
• Ubuntu 24.04: Cron Runs Manually but Not on Schedule — PATH/Env Gotchas and Fixes
• Tooltips Without Libraries: Positioning, Arrow, and ARIA-Friendly Patterns
• Docker Daemon Won’t Start: Read This Log First (Then Fix It)
• ZFS Benchmarking: The Rules That Prevent Fake Results
• ZFS mountpoint: The Mount Trap That Makes Datasets ‘Disappear’
• Proxmox OOM-killer events: why it kills processes and how to set sane limits
• Accessible Focus States That Don’t Look Like Trash
• Proxmox console won’t open (SPICE/noVNC): where it breaks and how to fix
• Docker Mount Propagation Gotcha: Why Your Bind Mount Looks Empty (and Fixes)
• Docker “manifest unknown”: tags vs digests explained (and fixed)
• Debian 13: TRIM Isn’t Running — Enable the fstrim Timer and Verify It Works
• Proxmox PCI Passthrough Fails: IOMMU Groups and the Classic Traps
• ZFS send/receive DR drill: Practicing Restore, Not Just Backup
• Docker Compose Profiles: Dev/Prod Stacks Without Duplicate YAML
• ZFS snapshot deletion: Why Snapshots Refuse to Die (and How to Fix It)
• Docker “exec format error”: Wrong-Arch Images and the Clean Fix
• Modern CSS :has() in Real UI: Parent Selectors for Forms, Cards, Filters
• Ubuntu 24.04 TLS/Cert Errors After Time Drift: Fix NTP/Chrony the Right Way
• ZFS Disaster Scenarios: What Fails First and What You Can Save
• ZFS Replication Over WAN: Making Sends Fast on Slow Links
• PostgreSQL vs YugabyteDB: distributed Postgres-style—amazing or overkill
• DNS Wildcard Records: The Convenience That Quietly Breaks Things (and Fixes)
• Split-horizon DNS: Make LAN names resolve without breaking the public internet
• PostgreSQL vs Percona Server tuning: who needs more knobs for speed
• Breadcrumbs + Next/Prev Navigation for Documentation Sites (Clean, Fast, Accessible)
• Proxmox “could not resolve host”: DNS/IPv6/proxy quick root-cause workflow
• Docker volumes: Permission denied — UID/GID strategies that stop the pain
• Port 25 Blocked: How to Send Email Anyway (Without Sketchy Hacks)
• ZFS for Backups: Snapshots + Send/Receive Without Tears
• MySQL vs PostgreSQL Connection Pooling: Who Needs It Earlier on a VPS
• ZFS Replacing Disks: The Safe Workflow That Avoids Pool Drama
• ZFS Slop Space: Why Pools Feel Full Before 100%
• RDP Between Offices Without Open Ports: The Safe “RDP Only via VPN” Setup
• MikroTik IPsec IKEv2 Between Offices: How to Make It Stable (and Why It Flaps)
• ZFS quota vs reservation: The Space Control Pair You Must Understand
• MariaDB vs Redis: caching patterns that speed up websites without data loss