Sharing Java developer knowledge, practical articles, and continuous insights into computer engineering.
This article explains what a logging service is, compares ELK and custom appender solutions, shows how to create a Logback appender by extending AppenderBase, provides a complete Java example with configuration, and demonstrates the custom appender in action for backend developers.
This guide explains how to create a Bash script that monitors a Jenkins Docker container, automatically restarts it when it stops, grant the script execution rights, and schedule it with cron to run every ten seconds, eliminating manual docker restart commands.
This guide explains why every server must monitor CPU, memory, disk and network usage, shows how to clean disks and analyze traffic using command‑line utilities such as df, du, iotop, iostat, iftop, lsof and tcpdump, and provides real‑world case studies for troubleshooting disk space exhaustion, port conflicts and abnormal outbound traffic.
This guide walks through the fundamentals of DevOps, illustrating how to transition from simple command‑line deployments to sophisticated, automated CI/CD pipelines using Jenkins, Docker, and shell scripts, while covering JVM tuning, version management, and common troubleshooting tips.
This guide walks through capturing a third‑party QR‑code login flow with Charles, converting the captured requests to cURL, analyzing them in Apifox, and reproducing the entire process to embed external platform authentication into a custom web and mobile application.
This guide walks through practical RBAC design using Sa-Token, providing MySQL table schemas for users, roles, permissions, sample data, and Spring Boot API code for authentication, authorization checks, and retrieving the logged‑in user's details.
This beginner-friendly guide explains core authentication mechanisms, the OAuth2.0 flow, token types, the role of refresh tokens, JWT pitfalls, and RBAC design, providing a solid foundation for secure backend development.
This article explains a complete, reusable solution for recording operation logs in Java backend applications using Spring AOP, custom annotations, callback interfaces, and a user‑adapter to bridge third‑party logging libraries with the main program, enabling flexible storage and auditing.
Learn how to protect your services from abusive traffic and brute‑force attacks by using Nginx's rate‑limiting features—limit_req to control request rates and limit_conn to restrict concurrent connections—complete with configuration examples, explanations of zones, burst handling, custom error pages, and log monitoring.
This guide shows how to install, configure, and use Ngrok on macOS to create a secure public tunnel that forwards internet traffic to a local development server, enabling quick testing without deploying to a public server.
