Linux

• ZFS sharenfs/sharesmb: Convenience vs Control in Production
• Ubuntu 24.04: “dpkg was interrupted” — the safe repair sequence (no roulette)
• Proxmox “TASK ERROR: timeout waiting for …”: pinpoint what actually timed out
• WordPress brute force attacks: lock down login without locking yourself out
• ZFS 80% Rule: Myth, Truth, and the Real ‘Danger Zone’
• Proxmox Corosync “link down”: why the cluster flaps and how to stabilize it
• MariaDB vs PostgreSQL Defaults: One Forgives, One Punishes
• Proxmox “migration aborted”: common reasons and the repair path
• Heartbleed: the bug that showed the internet runs on duct tape
• Docker “bind: address already in use”: find the process and fix cleanly
• ZFS Space Accounting: Why du and zfs list Disagree
• WireGuard: the simplest client setup on Windows/macOS/Linux (and the usual pitfalls)
• ZFS Log Analysis: Finding Slowdowns Before They Become Outages
• Docker: Secrets without leaks — stop putting passwords in .env
• MariaDB vs PostgreSQL for Ecommerce Writes: Who Chokes First (and How to Prevent It)
• Debian 13: UEFI entry vanished — restore boot with efibootmgr in minutes
• Proxmox filesystem becomes read-only: why it happens and how to recover
• Proxmox “cannot get exclusive lock”: what’s holding the VM and how to release it
• WooCommerce Slow Admin Orders: Find Heavy Queries and Speed Them Up
• Ubuntu 24.04: TLS handshake failures in curl — SNI/CA/time quick fix checklist
• ZFS zpool iostat -w: Understanding Workload Patterns in Real Time
• Ubuntu 24.04: logrotate isn’t rotating — the one config mistake that keeps biting people
• MySQL vs MariaDB: temp tables on disk—how to stop them for real
• Debian 13 “Unable to locate package”: repo, architecture, and sources.list traps (and fixes)
• ZFS destroy safety: The Checks That Prevent ‘Oops, Wrong Dataset’
• MariaDB vs PostgreSQL: rate limiting by DB—why it’s a trap and what to do instead
• Docker vs iptables/nftables: stop the firewall war and fix networking
• Proxmox “Too Many Open Files”: What Limit to Raise, and for Which Service
• Debian 13 “Could not resolve host”: DNS/proxy/IPv6 — the fastest triage path
• ZFS Latency Spikes: The Checklist That Finds the Cause
• MariaDB vs PostgreSQL Restore Speed: How to Get RTO Under 15 Minutes
• Email “451 temporary local problem” — find the server-side issue fast
• Anchor Links That Feel Like Docs Sites: Hover Icons, Offsets, and Clickable Headings
• PostgreSQL vs Aurora PostgreSQL: cost surprises during spikes (and how to avoid them)
• Proxmox pveperf Shows Nonsense: How to Benchmark Properly
• WordPress Mixed Content: why HTTPS still shows warnings and how to fix properly
• Docker: Slow writes on overlay2 — when to switch to volumes and why
• Debian/Ubuntu “Works on LAN, fails on WAN”: Routing and NAT checks that reveal the cause (case #25)
• Ceph on Proxmox: when it’s worth it, when it’s a trap, and how to size it correctly
• Ubuntu 24.04: iperf shows speed but app is slow — the hidden bottlenecks to check (case #24)