Reflections on 2025 — covering work, learning, health, books, games, anime, and travel.

Get free Let's Encrypt wildcard certificates via acme.sh + Cloudflare DNS API with automatic renewal.

Clarifying the differences between docker commit/export/import/save/load and when to use each one.

A complete guide to deploying a 3-node Nacos 2.2 cluster with Docker, using MySQL for persistence and Nginx for load balancing.

Install multiple JDK versions on Windows using Scoop package manager and switch between them with a single command — no more manual environment variable tweaking.

A checklist for securing and setting up a new Linux server, including SSH hardening, Docker, NPM, and more.

Integrate email sending in Spring Boot, implement async email with @Async, and troubleshoot common @Async pitfalls.

A progressive guide from raw API debugging to a clean Spring Boot utility class, covering configuration property binding and static utility design.