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Refining Core Development Skills

Fei has over 10 years of development experience at Tencent and Sogou. Through this account, he shares his deep insights on performance.

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Latest from Refining Core Development Skills

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Refining Core Development Skills

Jan 28, 2022 · Information Security

Detecting a Hidden Mining Virus in a Linux System: A Narrative

A dramatized Linux security incident shows how administrators use commands like top, ps, netstat, and the unhide tool to discover hidden mining processes, isolate suspicious network connections, and finally terminate the malicious hidden PID, illustrating practical techniques for rootkit detection and response.

linuxprocess hidingrootkit detection

0 likes · 7 min read

Detecting a Hidden Mining Virus in a Linux System: A Narrative

Refining Core Development Skills

Jan 24, 2022 · Fundamentals

How Linux Servers Handle 0.0.0.0 Binding: A Deep Dive into Network Socket Implementation

This article explains how Linux servers handle binding to 0.0.0.0, detailing the internal mechanisms of socket binding, listening, and packet processing, with source code analysis to clarify the differences between binding to 0.0.0.0 versus specific IP addresses.

0.0.0.0 bindingLinux networkingnetwork protocols

0 likes · 6 min read

How Linux Servers Handle 0.0.0.0 Binding: A Deep Dive into Network Socket Implementation

Refining Core Development Skills

Jan 13, 2022 · Cloud Native

Understanding Linux Routing for Container and Cloud‑Native Networking

This article explains the fundamentals of Linux routing, why routing is required for containers and overlay networks, how the kernel selects routes when sending and receiving packets, and provides practical commands and code examples for configuring and testing routing tables in cloud‑native environments.

IP forwardingNetwork NamespaceOverlay Network

0 likes · 13 min read

Understanding Linux Routing for Container and Cloud‑Native Networking

Refining Core Development Skills

Jan 6, 2022 · Fundamentals

The Evolution and Principles of Coroutines: From COBOL to Modern Languages

This article traces the historical origins of coroutines from early COBOL compiler challenges, explains their cooperative execution model, compares them with thread scheduling, and reviews how modern languages like Python, C++ and Go implement coroutine support to improve IO‑bound performance.

C++GoIO

0 likes · 16 min read

The Evolution and Principles of Coroutines: From COBOL to Modern Languages

Refining Core Development Skills

Dec 21, 2021 · Fundamentals

Why Unix Domain Sockets Outperform 127.0.0.1 Loopback: Deep Dive & Benchmarks

This article explains the internal mechanics of Unix Domain Sockets, shows how they differ from traditional 127.0.0.1 TCP loopback, provides sample code for server and client, and presents benchmark results demonstrating significantly lower latency and higher throughput for local IPC.

IPCLinux networkingUnix Domain Socket

0 likes · 11 min read

Why Unix Domain Sockets Outperform 127.0.0.1 Loopback: Deep Dive & Benchmarks

Refining Core Development Skills

Dec 14, 2021 · Fundamentals

Why Practice and Implementation Matter in Learning Computer Networks

The article argues that both hands‑on practice and deep understanding of network implementations are essential for computer‑science students and engineers, illustrating the gap with theory‑only learning, presenting the pyramid learning model, recommending Linux tools, coding exercises, and detailed studies of TCP, epoll, and I/O performance.

ImplementationTCPlinux

0 likes · 13 min read

Why Practice and Implementation Matter in Learning Computer Networks

Refining Core Development Skills

Dec 7, 2021 · Information Security

Understanding iptables and Netfilter: The Five Chains and Four Tables in Linux Kernel Networking

This article explains how iptables, built on the Netfilter framework, processes network packets through five kernel hooks and four tables, covering the receive, send, and forward paths, and demonstrates practical NAT, DNAT, filter, raw, and mangle rules for Docker and Kubernetes environments.

Dockerfirewalliptables

0 likes · 20 min read

Understanding iptables and Netfilter: The Five Chains and Four Tables in Linux Kernel Networking

Refining Core Development Skills

Nov 16, 2021 · Fundamentals

Understanding Docker Virtual Network Fundamentals

This article explains Docker's network virtualization principles, covering veth devices, bridge networks, Linux namespaces, and NAT techniques for container communication.

0 likes · 30 min read

Understanding Docker Virtual Network Fundamentals

Refining Core Development Skills

Nov 1, 2021 · Fundamentals

Understanding Linux File System: Disk Structure, Inodes, and Performance Optimizations

This article explains the physical structure of mechanical disks, partitioning strategies, inode and block allocation, and how filename length and directory layout affect Linux file system performance, providing practical experiments and tips for improving disk I/O.

disk-iofile-systemfilesystem performance

0 likes · 17 min read

Understanding Linux File System: Disk Structure, Inodes, and Performance Optimizations

Refining Core Development Skills

Oct 25, 2021 · Fundamentals

Understanding Linux Network Namespaces: Implementation, Usage, and Internals

This article explains how Linux network namespaces provide isolated network stacks by using virtual Ethernet devices, kernel data structures, and per‑namespace routing and iptables, offering step‑by‑step commands, code excerpts, and deep insight into the kernel mechanisms that enable container networking isolation.

Network NamespaceVirtual Ethernetisolation

0 likes · 18 min read

Understanding Linux Network Namespaces: Implementation, Usage, and Internals