Practical notes from cloud architecture, platform engineering, security, and production operations.
All notes
A real case: Modern Events Calendar (MEC) was responsible for 28 out of 31 outbound HTTP calls and 16 seconds of additional latency on every WordPress admin request. How it was found and stopped.
Fix Nginx 404 errors on .well-known/acme-challenge during Let's Encrypt HTTP-01 validation with webroot config and renewal checks.
A layered WordPress hardening checklist for Apache on LAMP: SSH, .htaccess, wp-config, uploads, and plugin controls, with Nginx equivalents where useful.
Deploy a production-ready WordPress LEMP stack on Ubuntu 18.04 with Nginx, MariaDB, PHP, TLS via Let's Encrypt, and baseline hardening controls.
Recover a high-availability Chef cluster when Elasticsearch shard allocation or service health issues block normal Chef Server operation.
Configure MySQL or MariaDB character sets and collations in Docker, verify Unicode storage, and understand durability tradeoffs.
Resolve MongoDB service startup failures on Ubuntu 15.04 during the Upstart-to-systemd transition, with unit files and verification steps.
Fix CSV UTF-8 encoding corruption in Microsoft Excel with correct import settings, UTF-8 BOM handling, and verification steps.
Create trackable vanity URLs for print, QR, and email campaigns with Apache redirects, UTM parameters, and maintainable campaign rules.
Prevent Cloudflare origin and preview subdomains from creating duplicate-content SEO issues with host-aware robots, canonical URLs, and redirects.
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