The best way to learn filesystems is to write one yourself. This post uses FUSE + Go to implement an in-memory filesystem with basic read/write operations, deep-diving into core concepts like inode and block.

Textbook LRU uses a doubly-linked list + HashMap. But why does Redis use “approximate LRU”? This post dives into Redis source code to analyze the engineering trade-offs behind different eviction strategies.

To be a solid systems engineer, you need to deeply understand the Linux boot process. Only by knowing “what normal looks like” can you quickly troubleshoot when things go wrong. This post walks through every stage from power button to login screen.

From the early days of hugo && scp to Git Push-triggered auto-deployment — this post documents the evolution of my Hugo blog CI/CD setup, along with production-grade GitHub Actions best practices.

A simple requirement: make a Flatpak-installed PDF reader support dark mode. But solving it involves Flatpak’s sandbox mechanism, filesystem mounts, and environment variable injection — concepts highly similar to Docker/K8s containerization.

Bit operations aren’t just interview questions. From Redis Bitmaps and Kafka ACLs to Linux file permissions, bit operations are fundamental to high-performance systems. This post demonstrates bit operations in real systems through practical examples.