Linux

• MariaDB vs Redis: caching patterns that speed up websites without data loss
• WordPress Core Web Vitals: real fixes for LCP/INP/CLS
• Ceph performance on Proxmox is slow: 10 checks that actually find the bottleneck
• MySQL vs MariaDB upgrades: how to update without nuking production
• Docker Multi-Network Containers: Stop Accidental Exposure to the Wrong Network
• ZFS Send Stream Compatibility: Moving Data Between Different ZFS Versions
• ZFS Resilver vs Scrub: Stop Mixing Them Up
• Docker Compose “version is obsolete”: modernize your compose file safely
• Email deliverability: Messages land in spam — the real fixes (SPF/DKIM/DMARC done right)
• Proxmox “qemu-img: Could not create”: permissions, paths, and filesystem fixes that actually work
• Ubuntu 24.04: IPv6 firewall forgotten — close the real hole (not just IPv4) (case #72)
• MySQL vs TiDB: MySQL Compatibility vs Operational Complexity—What You’re Signing Up For
• ZFS iSCSI: ZVOL Setup That Doesn’t Stutter Under Load
• Ubuntu 24.04 “Connection reset by peer”: Prove whether it’s client, proxy, or server (case #14)
• Email: Authenticated relay vs direct send — pick the approach that doesn’t get you blocked
• Debian 13: Thermal throttling ruins throughput — prove it and fix cooling/power limits
• Debian 13 IRQ storms and weird latency: check irqbalance and fix interrupts
• Ubuntu 24.04: Secure Boot Blocks Drivers — Fix It Without Nuking Your Setup
• MySQL vs Percona Server: replication stability—why ops teams switch
• ZFS snapdir=visible: Auditing Snapshots Without Making Users Rage
• Proxmox backups to PBS fail: common chunk/space errors and what to do
• Docker on Windows/WSL2 is slow: fixes that actually help
• ZFS Prefetch: The Hidden Setting Behind Cache Thrash
• Ubuntu 24.04: sudo is slow — DNS/hostname fixes that remove the delay (case #66)
• ZFS RAIDZ1: The Risk Calculation Most People Never Do
• Email: Multiple MX records — how priority really works (and common mistakes)
• Tabs and Accordions Without Libraries: details/summary + Progressive Enhancement
• Email Catch‑all Mailbox: Why It Ruins Deliverability (and Safer Alternatives)
• ZFS zpool iostat -v: Finding the One Disk That’s Ruining Latency
• Modern CSS Holy Grail Layout: Header, Footer, Sidebar Without Hacks
• Ubuntu 24.04: NVMe Disappears Under Load — the Power/ASPM Settings That Often Fix It
• MySQL vs MariaDB: the “default” choice that secretly slows your VPS
• Proxmox “pmxcfs is not mounted”: why /etc/pve is empty and how to recover
• Docker OOM in Containers: The Memory Limits That Prevent Silent Crashes
• Debian 13: fstab mistake prevents boot — the fastest rescue-mode fix
• Proxmox Time Drift: NTP Issues That Break TLS/PBS and How to Fix
• DNS Across Offices: Make Hostnames Resolve Everywhere (Windows + Linux)
• Design Tokens for a Docs Theme: CSS Variables, X-Style Dark Mode, Reduced Motion
• PostgreSQL vs MongoDB Transactions: Where Reality Differs From Docs
• ZFS SMB Durable Handles: Why Copy/Move Behavior Feels Weird
• DNS: BIND9 zone won’t load — the top syntax mistakes and fast fixes
• Ubuntu 24.04 systemd unit overrides: fix services cleanly without editing vendor files (case #8)
• Site-to-site VPN: connect two offices into one network (a simple plan that works)
• Proxmox Won’t Boot After a Kernel Update: Roll Back via GRUB the Right Way
• Debian 13 “Broken pipe” errors: when it’s harmless and when it’s your first warning (case #15)
• Proxmox “failed to start pve-ha-lrm”: why HA won’t start and what to check
• ZFS txg_timeout: Why Writes Come in Bursts (and How to Smooth Latency)
• NAT over VPN for Overlapping Networks: How to Connect Them Without Regret
• Docker buildx multi-arch: stop shipping the wrong binaries
• Docker Compose Zero-Downtime Updates: Myth, Reality, and Patterns That Work