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Lightweight Production Monitoring & Alerting System — A 5-Minute Guardian in 85 Lines of Shell Script

Based on a production-grade monitor.sh script, this article details the design philosophy behind container status checks, API health probes, and memory/disk/Swap threshold alerts. It covers cron automation, the fault-tolerance philosophy of set +e, and webhook extension plans.

Operations and Deployment

Financial Audit System: NestJS Xendit Payout + @DistributedLock + Cron Ghost Order Auto-Recovery

In-depth analysis of a production-grade financial audit system, covering distributed locks to prevent duplicate payouts, Xendit third-party payout integration, Cron auto-recovery mechanisms, and a complete state machine design.

Backend Development

Redis Distributed Lock System: Decorator-Based Concurrency Control

JoyMini API's distributed lock system is based on Redis SET NX PX atomic operations and Lua script unlocking, providing a declarative API through the @DistributedLock decorator, covering three modes: Cron task deduplication, API endpoint rate limiting, and nested critical sections.

Interface Management