MariaDB vs PostgreSQL: Replication vs PITRβWhat Actually Saves You After Human Error
Replication keeps you online; PITR saves you from humans. Learn how MariaDB and PostgreSQL recover after bad deletes, drops, and fat-fingered deploys.
DNS TTL Mistakes That Haunt Migrations β How to Set TTL Like a Pro
DNS TTL decides how fast traffic moves during migrations. Learn pro TTL strategy, common failure modes, and command-driven checks to avoid outages.
Sticky header that hides on scroll: CSS-first approach + minimal JS fallback
Build a sticky header that hides on scroll using CSS-first patterns and a tiny JS fallback. Diagnose jank, accessibility traps, and layout shifts fast.
ZFS SATA Link Resets: The Controller/Cable Failure Pattern
Learn to diagnose ZFS SATA link resets fast: spot controller vs cable patterns, read logs, run commands, and choose fixes that stick in production.
Docker Healthchecks Done Right β Stop Deploying βGreenβ Failures
Make Docker healthchecks tell the truth: catch βgreenβ failures, tune timeouts, avoid restart loops, and diagnose bottlenecks fast in production.
VPN logs that matter: find “won’t connect” causes in MikroTik/Linux logs
A production-grade guide to diagnose VPN βwonβt connectβ issues using MikroTik and Linux logs, with commands, patterns, and fast triage steps.
Debian 13: Recover root access with rescue mode β do it without making it worse
A production-safe rescue-mode playbook for Debian 13: regain root access, verify disks and mounts, fix auth safely, and avoid data-loss traps.
Docker: Start Order vs Readiness β the Approach That Prevents False Starts
Stop Docker false starts by separating startup order from readiness. Use healthchecks, wait strategies, and evidence-based diagnosis for stable boot-ups.
SPF/DKIM Pass but Still Spam: The Hidden Signals to Fix
SPF and DKIM passing yet mail lands in spam? Diagnose reputation, alignment, content, feedback loops, and delivery signals with commands and fixes.
Pure CSS Skeleton Screens: Shimmer, Reduced Motion, and Performance
Build pure CSS skeleton loaders with shimmer, respect reduced motion, and avoid jank. Diagnose bottlenecks fast with practical browser and OS checks.
WordPress 100% CPU usage: find the plugin/bot hammering your site
A practical SRE guide to diagnose WordPress pegging CPU: identify the plugin, bot, query, or cron job causing load and fix it safely.
Email ARC explained (the short, useful version) β when it helps forwarded mail
ARC makes forwarded mail authenticate by preserving SPF/DKIM/DMARC results. Learn when it helps, how to debug it, and how to avoid common breakages.
Proxmox βnode not in clusterβ: what happened and how to rejoin correctly
Diagnose why a Proxmox node says βnot in cluster,β verify corosync quorum, fix config drift, and rejoin safely without nuking VMs or storage.
Proxmox βunable to write /etc/pve/*β: disk, pmxcfs, or permissions β how to tell
A production-grade guide to pinpoint why Proxmox canβt write /etc/pve/*: disk-full, pmxcfs/Corosync quorum, or permissionsβfast, safely.
Chipset eras: when the motherboard decided half your performance
A practical, ops-minded guide to chipset eras, why motherboards used to bottleneck performance, and how to diagnose todayβs hidden platform limits fast.
ZFS SAS Expander Tuning: Avoiding Saturation and Link Bottlenecks
Diagnose and tune ZFS with SAS expanders: spot saturation, fix link bottlenecks, validate queueing, and keep rebuilds and scrub predictable in production.
Ubuntu 24.04: Jumbo frames break βonly someβ traffic β how to test and fix MTU safely
Learn why jumbo frames break only some traffic on Ubuntu 24.04, how to test MTU end-to-end, and how to roll out safe fixes without downtime.
Office VPN with Dynamic IPs: DDNS and Strategies That Donβt Fall Apart
Build an office VPN that survives dynamic IP changes: DDNS done right, resilient WireGuard/OpenVPN setups, monitoring, and failure-proof operational playbooks.
Storage for Virtualization on Proxmox: ZFS vs Ceph vs iSCSI vs NFS
Choose Proxmox storage with fewer regrets: when ZFS wins, when Ceph is worth it, and how iSCSI/NFS behave under VM workloads.
Proxmox NFS βstale file handleβ: why it happens and how to prevent it
Learn why Proxmox NFS stale file handle errors happen, how to diagnose them fast, and how to harden NFS exports, mounts, and workflows.
WordPress REST API Blocked by a Security Plugin: Allow Safely, Not Blindly
Diagnose and safely allow WordPress REST API when security plugins block it. Use logs, WAF rules, auth checks, and least-privilege access.
MySQL vs RDS MySQL: the hidden limits that bite during incidents
Learn which MySQL limits differ on RDS: storage, IOPS, temp space, replicas, locks, timeouts, and observabilityβplus incident playbooks and fixes.
PostgreSQL vs Redis for sessions, rate limits, and queues
Pick the right store for sessions, rate limits, and queues. Learn failure modes, diagnostics, and ops checklists for PostgreSQL vs Redis in prod.
Proxmox βguest agent not runningβ: enable QEMU Guest Agent and make it stick
Fix Proxmox βguest agent not runningβ for good: install and enable QEMU Guest Agent, verify virtio-serial, and prevent regressions after updates.
Debian 13: systemd timers vs cron β switching for reliability (and avoiding common traps)
Move scheduled jobs from cron to systemd timers on Debian 13 with fewer missed runs, clearer logs, sane failure handling, and safe migration steps.
Docker Swap Storms: Why Containers βWorkβ While Your Host Melts (and Fixes)
Learn how Docker swap storms happen, why containers look healthy while the host thrashes, and practical fixes: cgroups, PSI, swappiness, and OOM tuning.
Proxmox Windows VM Has No Network: VirtIO NIC Driver Fixes That Actually Work
Fix a Windows VM with no network on Proxmox by validating VirtIO NIC model, drivers, DHCP, firewall, and bridges using proven checks and commands.
Office VPN + VoIP: How to Reduce Jitter and Latency Over Tunnels
A practical SRE guide to fixing VoIP over office VPN tunnels: measure jitter, tame queues, tune MTU/MSS, and stop latency spikes without guesswork.
Debian 13: iptables vs nftables conflict β stop the silent firewall war
On Debian 13, iptables and nftables can both appear βactiveβ while fighting for control. Learn fast diagnosis, fixes, and sane ops patterns.
Microcode: the βfirmwareβ inside your CPU you canβt ignore anymore
Microcode updates can change CPU behavior, fix security bugs, and break performance. Learn how to audit, deploy, and troubleshoot them safely.
Proxmox Backup βNo space left on deviceβ: why it fails even when space seems free
Backups fail with βNo space left on deviceβ even with free GBs? Learn the real culprits: inodes, ZFS, PBS chunks, snapshots, tmpfs, and quotas.
WordPress + Cloudflare Cache Settings That Wonβt Break wp-admin
Practical Cloudflare caching rules for WordPress that speed up the site without breaking wp-admin, logins, previews, or cookies.
WordPress REST API error: what breaks REST and how to troubleshoot
Diagnose WordPress REST API errors fast: isolate auth, permalinks, caching, WAF, plugins, and server configs with commands, outputs, and fixes.
Office VPN: Allow Access to One Server/Port Only (Least Privilege)
Lock down office VPN access to a single server and port using least privilege, with practical firewall rules, routing, audits, and fast troubleshooting.
ZFS Using NVMe as SLOG: When Itβs Perfect and When Itβs Overkill
A practical guide to ZFS SLOG on NVMe: what it accelerates, what it canβt, how to size it, and how to diagnose real sync write bottlenecks.
Ubuntu 24.04 CPU Steal and Virtualization Overhead: How to Spot It and What to Do (Case #44)
Learn to detect CPU steal and virtualization overhead on Ubuntu 24.04, interpret metrics, and fix noisy neighbors, mis-sizing, and host contention fast.
PC HDR: Why Itβs Amazingβ¦ and Why Itβs Sometimes Awful
PC HDR can look jaw-dropping, but Windows, GPUs, games, and monitors often disagree. Learn fast diagnosis, fixes, and what to avoid.
ZFS ARC vs Linux Page Cache: Who Wins and Why You Should Care
A practical, ops-first deep dive into ZFS ARC vs Linux page cache: what they cache, how they evict, and how to diagnose real bottlenecks fast.
Docker containerd/runc errors: how to debug without reinstalling
A production-grade guide to debug Docker containerd/runc failures without reinstalling: logs, namespaces, storage, cgroups, seccomp, and fixes.
SPF Too Many DNS Lookups: Shrink It Safely and Pass Checks
Fix SPF βtoo many DNS lookupsβ without breaking mail: audit your record, collapse includes, flatten safely, and validate with repeatable DNS tests.
Infinity Fabric: the invisible link that can make-or-break performance
Infinity Fabric shapes Ryzen/EPYC latency and bandwidth. Learn how clocks, NUMA, and memory tuning decide real performanceβand how to debug it fast.
Docker Remote API: Donβt Accidentally Expose Root on the Internet
Learn how Docker Remote API exposure becomes instant root, how to detect it, lock it down with TLS, and respond fast when it leaks.
Email Not Sending from WordPress/App: SMTP Relay Setup That Actually Delivers
Fix WordPress/app email delivery with an SMTP relay that passes SPF/DKIM/DMARC, avoids spam, and gives logs, retries, and reliable monitoring.
WireGuard Site-to-Site: Connect Two Offices Over the Internet Step by Step
Practical WireGuard site-to-site setup between two offices: routing, NAT, MTU, firewall, testing, and fast diagnosis for real production networks.
From monoliths to chiplets: why modern CPUs look like LEGO
Chiplets replaced monolithic CPUs to boost yield, scale cores, and cut cost. Learn the tradeoffs, diagnose bottlenecks, and avoid real ops mistakes.
AI PC Hype vs Real Architecture Changes: What Actually Matters in 2026
AI PCs sell a story about NPUs and on-device models. Learn what changed in CPU, GPU, memory, storage, and opsβand how to diagnose bottlenecks fast.
Why printer drivers got huge: the bloat nobody asked for
Printer drivers grew from tiny translators into sprawling software stacks: filters, security, telemetry, fonts, color, and enterprise packaging realities.
Scroll-snap galleries: smooth horizontal content without JS
Build smooth horizontal scroll-snap galleries with pure CSS. Diagnose jank, layout shifts, and overflow bugs using practical checks and a fast playbook.
Gmail/Outlook delivery issues: the checks that matter in 2025
A production-grade guide to Gmail and Outlook delivery failures in 2025: fast triage, SPF/DKIM/DMARC checks, logs, queues, and fixes that stick.
DKIM body hash mismatch: the sneaky causes nobody tells you
Track down DKIM body hash mismatches fast: real failure modes, forensic commands, corporate incidents, and fixes for signing and transport edge cases.