Plan a cloud migration without importing old operational risk
A migration operating model for landing zones, ownership boundaries, IaC baselines, cutover planning, and cost control before workloads move to the target cloud.
Notes
Production notes
Practical notes from cloud migration, platform automation, security hardening, cost control, scaling, and production operations.
Block outgoing URL calls with iptables on Linux
Use iptables string matching to block specific outbound HTTP paths, understand HTTPS limits, and choose safer egress controls when needed.
How to fix slow WordPress admin
Diagnose slow WordPress admin performance by checking plugins, outbound API calls, Heartbeat behavior, object cache, and server limits.
Serve Let's Encrypt ACME challenges on Nginx
Fix Nginx 404 errors on .well-known/acme-challenge during Let's Encrypt HTTP-01 validation with webroot config and renewal checks.
Hardening WordPress on LAMP (Apache)
A layered WordPress hardening checklist for Apache on LAMP: SSH, .htaccess, wp-config, uploads, and plugin controls, with Nginx equivalents where useful.
Secured WordPress on LEMP Ubuntu 18.04 with Let's Encrypt
Deploy a production-ready WordPress LEMP stack on Ubuntu 18.04 with Nginx, MariaDB, PHP, TLS via Let's Encrypt, and baseline hardening controls.
Fixing Chef cluster issues
Recover a high-availability Chef cluster when Elasticsearch shard allocation or service health issues block normal Chef Server operation.
Configuring UTF-8 collation for MySQL or MariaDB on Docker
Configure MySQL or MariaDB character sets and collations in Docker, verify Unicode storage, and understand durability tradeoffs.
Installing MongoDB on Ubuntu 15.04
Resolve MongoDB service startup failures on Ubuntu 15.04 during the Upstart-to-systemd transition, with unit files and verification steps.
CSV UTF-8 encoding issues in Excel
Fix CSV UTF-8 encoding corruption in Microsoft Excel with correct import settings, UTF-8 BOM handling, and verification steps.
Marketing vanity URLs
Create trackable vanity URLs for print, QR, and email campaigns with Apache redirects, UTM parameters, and maintainable campaign rules.
Avoid duplicate-content SEO issues on Cloudflare origin subdomains
Prevent Cloudflare origin and preview subdomains from creating duplicate-content SEO issues with host-aware robots, canonical URLs, and redirects.
Git tips and tricks
Practical Git commands for rewriting authors, recovering work, inspecting history, bisecting bugs, and keeping repositories maintainable.
Lazy loading images with JavaScript
Use native browser lazy loading first, understand LCP and CLS tradeoffs, and keep JavaScript lazy-loading libraries for legacy cases.