Docker OOM in Containers: The Memory Limits That Prevent Silent Crashes
Learn how Docker memory limits, cgroups, and the OOM killer interact, and how to diagnose, prevent, and survive container OOMs in production.
Debian 13: fstab mistake prevents boot β the fastest rescue-mode fix
Boot broken by a bad /etc/fstab in Debian 13? Use rescue mode to mount, edit, verify UUIDs, and recover safely with fast checks and commands.
Proxmox Time Drift: NTP Issues That Break TLS/PBS and How to Fix
Fix Proxmox time drift that breaks TLS and PBS: diagnose NTP/PTP, VM clock sources, chrony/systemd-timesyncd, and harden hosts for stable backups.
DNS Across Offices: Make Hostnames Resolve Everywhere (Windows + Linux)
Make hostnames resolve across offices with split-horizon DNS, AD-integrated zones, conditional forwarders, and Linux resolversβdiagnose fast and fix for good.
Core and Core 2: Intelβs Comeback After NetBurst (and What Ops Learned)
How Intel escaped NetBurst with Core/Core 2: the microarchitecture choices that changed real-world latency, power, and ops decisionsβand how to diagnose them.
Design Tokens for a Docs Theme: CSS Variables, X-Style Dark Mode, Reduced Motion
A production-minded guide to design tokens for docs themes: CSS variables, X-style dark mode, reduced motion, tooling, tests, and failure modes.
PostgreSQL vs MongoDB Transactions: Where Reality Differs From Docs
A production-minded comparison of PostgreSQL and MongoDB transactions: isolation, durability, failure modes, and the commands that reveal truth under load.
ZFS SMB Durable Handles: Why Copy/Move Behavior Feels Weird
Durable SMB handles on ZFS keep file identity stable across reconnects, but they can make copy/move feel odd. Diagnose delays, locks, and metadata costs.
Why Microcode Updates Will Become as Normal as Driver Updates
Microcode updates are shifting from emergency patches to routine ops hygiene. Learn why, how to deploy safely, and what to check when things break.
DNS: BIND9 zone wonβt load β the top syntax mistakes and fast fixes
Diagnose BIND9 zones that wonβt load fast: read named logs, run named-checkzone, spot SOA/NS/serial/TTL pitfalls, and fix common syntax errors.
Ubuntu 24.04 systemd unit overrides: fix services cleanly without editing vendor files (case #8)
Learn clean systemd unit overrides on Ubuntu 24.04: drop-ins, safe edits, fast diagnosis, and failure-proof rollbacks for real production fixes.
Site-to-site VPN: connect two offices into one network (a simple plan that works)
A practical site-to-site VPN plan that joins two offices into one network: IP design, routing, MTU, DNS, monitoring, and failure playbooks.
Proxmox Wonβt Boot After a Kernel Update: Roll Back via GRUB the Right Way
Recover a Proxmox host that wonβt boot after a kernel update using GRUB rollback, safe ZFS tactics, and sane post-boot cleanup steps.
Debian 13 βBroken pipeβ errors: when itβs harmless and when itβs your first warning (case #15)
Learn when Debian 13 βBroken pipeβ is harmless noise vs a real outage signal. Diagnose TCP, pipes, SSH, Nginx, journald, and storage stalls fast.
Proxmox βfailed to start pve-ha-lrmβ: why HA wonβt start and what to check
When Proxmox shows βfailed to start pve-ha-lrmβ, HA is blocked by cluster, corosync, quorum, storage, or time issues. Diagnose fast.
UCIe and chiplet mix-and-match: what it changes for buyers
UCIe makes chiplets more interoperable, but buyers still need to validate latency, coherency, thermals, and supply chain. Hereβs how to buy safely.
ZFS txg_timeout: Why Writes Come in Bursts (and How to Smooth Latency)
Understand ZFS txg_timeout, transaction groups, and why writes burst. Learn practical diagnostics and tuning steps to smooth latency safely.
NAT over VPN for Overlapping Networks: How to Connect Them Without Regret
Connect overlapping IP networks over VPN using NAT without breaking routing, DNS, or apps. Includes fast diagnosis, commands, pitfalls, and fixes.
VRAM Evolution: From Simple GDDR to Pure Insanity
A practical, ops-minded tour of VRAM: why bandwidth exploded, why HBM exists, and how to diagnose real GPU memory bottlenecks in production.
Docker buildx multi-arch: stop shipping the wrong binaries
Build and publish correct multi-arch Docker images with buildx: prevent wrong CPU binaries, verify manifests, debug QEMU, and harden CI.
Docker Compose Zero-Downtime Updates: Myth, Reality, and Patterns That Work
Zero-downtime on Docker Compose is possibleβbut not by wishful thinking. Learn reality, failure modes, and workable blue/green patterns with commands.
WordPress Slow on Mobile: What to Optimize First
Mobile WordPress feels slow for predictable reasons. Learn the fastest way to find the bottleneck, run real commands, and fix the right thing first.
VPN MTU tuning: why big files stall while web works (and how to pick the right MTU)
When VPNs break big transfers but browsing still works, MTU and PMTUD are usually guilty. Learn how to measure, choose, and enforce a safe MTU.
ZFS Pool Recovery Basics: The Steps That Avoid Making It Worse
A practical ZFS pool recovery guide for on-call engineers: fast diagnosis, safe commands, common failure modes, and step-by-step checklists to avoid data loss.
RISC-V: Real Challenger or Beautiful Idea?
An SRE-grade look at RISC-V: where it wins, where it hurts, and the ops checks that decide if itβs production-ready or just elegant.
ZFS dnodesize=auto: The Metadata Boost Everyone Forgets
How ZFS dnodesize=auto quietly improves metadata efficiency for xattrs, ACLs, and small filesβplus diagnostics, commands, pitfalls, and ops stories.
Ubuntu 24.04: IPv6 firewall forgotten β close the real hole (not just IPv4) (case #12)
Ubuntu 24.04 often ships with IPv4 rules but leaky IPv6 exposure. Audit nftables, UFW, and services so dual-stack hosts are truly closed.
Ubuntu 24.04: Netplan changes donβt apply β why (and how to make them stick)
Netplan changes not applying on Ubuntu 24.04? Learn the real causesβcloud-init, NetworkManager, renderer mixups, and permissionsβplus fixes that stick.
ZFS vs btrfs: Snapshots, RAID, RecoveryβWhich One Bites Less?
A practical, ops-first comparison of ZFS and btrfs for snapshots, RAID, performance, and recoveryβwith commands, pitfalls, and triage playbooks.
ZFS Compression Benchmarks: Measuring Real Gains, Not Placebo
How to benchmark ZFS compression without fooling yourself: what to measure, commands to run, how to read stats, and common traps in production.
Ubuntu 24.04 βNetwork is unreachableβ: routing table truth serum (and fixes)
Fix Ubuntu 24.04 βNetwork is unreachableβ fast by interrogating routes, rules, and neighbors. Learn the routing table truth serum and real fixes.
RGB over FPS: the decade LEDs took over gaming PCs
A practical, ops-minded look at how RGB became default in gaming PCsβand how to diagnose, control, and prevent lighting from stealing stability.
USB-C chaos: the universal port that isn’t universal
USB-C looks universal, but cables, power modes, and protocols vary wildly. Learn to diagnose, verify, and standardize USB-C in production.
Proxmox Web UI Wonβt Open on Port 8006: Restart pveproxy and Get Access Back
Fix Proxmox web UI down on port 8006 with fast diagnostics, pveproxy restarts, log checks, TLS fixes, and firewall/network tests.
ZFS Scrub Scheduling: How to Avoid Peak-Hour Pain
Practical ZFS scrub scheduling for production: control I/O impact, pick safe windows, tune scrub behavior, and diagnose bottlenecks before users complain.
Docker βNo Space Left on Deviceβ: The Hidden Places Docker Eats Your Disk
Track down Docker disk leaks fast: where layers, logs, volumes, build cache, and overlay2 hide, plus safe cleanup commands and decision rules.
Proxmox βdpkg was interruptedβ: Fix Broken Packages Without Reinstalling
Recover Proxmox from βdpkg was interruptedβ and broken apt states using safe commands, diagnosis steps, and rollback tacticsβno reinstall needed.
ZFS volblocksize: The VM Storage Setting That Decides IOPS and Latency
ZFS volblocksize can make VM disks fast or painfully latent. Learn how it affects IOPS, write amplification, sync writes, and how to diagnose it safely.
The northbridge that disappeared: how integration rewired PCs
Northbridge disappeared as CPU integration pulled memory, PCIe, and graphics on-die. Learn what changed, diagnose bottlenecks fast, and avoid failures.
PL1, PL2, and Tau Explained: The Three Numbers That Decide Everything
Understand PL1, PL2, and Tau, how they shape CPU performance, thermals, and stability, and how to diagnose real bottlenecks with commands.
ZFS zpool split: Cloning a Mirror Pool for Migration or DR
A practical, production-focused guide to zpool split: clone mirrored pools for migration or DR, avoid pitfalls, and verify every step.
MariaDB vs Percona Server Upgrades: How to Avoid βWorks on Stagingβ Lies
A production-grade guide to upgrading between MariaDB and Percona Server: compatibility traps, test realism, fast diagnosis, and exact verification tasks.
Mail bounces: how to read bounce codes like a pro (and fix the root cause)
Learn to decode SMTP bounce codes fast, map symptoms to root causes, and fix deliverability issues with practical commands and playbooks.
Why AI Ate the GPU Market: The Simplest Explanation
A practical SRE-grade explanation of why AI consumed the GPU market: economics, bottlenecks, software stacks, and what to check first in production.
Docker File Watching Is Broken in Containers: Fix Dev Hot Reload Reliably
Stop hot reload flakiness in Docker. Diagnose inotify vs polling, bind mount bottlenecks, WSL2/macOS quirks, and fix watches reliably.
Debian 13 LACP Bonding Flaps: Proving Whether the Switch or Host Is Wrong
A practical Debian 13 playbook to prove LACP bonding flaps are caused by the switch or the host using logs, counters, traces, and tests.
Docker Private Registry TLS Errors: Fix Certificate Chains Properly
Diagnose Docker registry TLS failures by fixing certificate chains, SANs, trust stores, and intermediatesβwithout insecure hacks or downtime.
WooCommerce Critical Error After Update: Roll Back and Recover Safely
Fix WooCommerce critical errors after updates safely: diagnose fast, roll back plugins/themes, recover the database, and prevent repeat incidents.
Docker Redis persistence without turning it into a slow disk app
Keep Redis data safe in Docker without killing latency. Choose AOF/RDB wisely, tune fsync, and validate storage behavior with fast, practical checks.
Proxmox LXC Bind-Mount Permission Denied: UID/GID, Unprivileged Containers, and the Fix That Actually Works
Fix Proxmox LXC bind-mount permission denied in unprivileged containers by mapping UID/GID correctly, auditing ACLs, and choosing safe mount options.