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Linux Boot Process: Complete Guide from Power Button to Login

Paul published on 2021-05-20 included in Linux

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.

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 Boot Process, Systemd, Debugging

Hugo Blog CI/CD: GitHub Actions Auto-Build and Multi-Environment Deployment

Paul published on 2021-03-21 included in Linux

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.

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 CI/CD, GitHub Actions, Automation

Linux Desktop Customization: Flatpak Theme Integration and Container Isolation Principles

Paul published on 2021-01-26 included in Linux

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.

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 Containers, Sandbox, Namespaces

Bit Operations in Practice: From Bitmap Indexes to High-Performance Permission Systems

Paul published on 2021-01-11 included in Go

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.

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 Bit Operations, Performance, System Design

From TimSort to pdqsort: Engineering Optimizations in Production Sorting

Paul published on 2018-06-21 included in Go

Textbook quicksort is just the starting point. Real-world sorting algorithms have undergone decades of engineering optimization. This post deep-dives into Python’s TimSort and Go/Rust’s pdqsort, revealing the gap between “industrial-grade” and “textbook-grade”.

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 Sorting Algorithms, Source Code Analysis, Performance
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