cloudflare/cloudflare-blog
FreeCloudflare Blog code samples
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About cloudflare/cloudflare-blog
A public GitHub repository by Cloudflare containing code samples that accompany technical blog posts published on the Cloudflare blog. The repo covers a wide range of low-level networking, kernel, and performance topics including eBPF, TCP connection handling, SYN floods, slow downloads, memory management, I/O submission, BPF tail calls, kernel fuzzing, and more. Implementations are provided in multiple languages: C (62%), Python (24%), Go, Rust, LLVM, and Makefile. Licensed under BSD-3-Clause, the repo serves as a reference for engineers interested in real-world networking and systems programming.
Key Features
Code samples from official Cloudflare engineering blog technical posts
Focus on kernel networking, eBPF, TCP, memory management, and performance tuning
Multilingual: C, Python, Go, Rust, LLVM, Makefile
Open source under BSD-3-Clause license
Structured by blog post topic and date (folders like 2018-03-ebpf, 2022-02-io_uring-worker-pool)
Pros & Cons
Pros
- High‑quality, production‑oriented code written by Cloudflare engineers
- Covers a broad variety of advanced networking and systems topics
- Open source and freely available under a permissive license
- Directly paired with explanatory blog posts for context
Cons
- Not a standalone library or tool – intended as supplementary sample code
- Examples may require specific kernel versions or hardware for reproduction
- No versioned releases or packages; relies on Git history
- Limited documentation beyond in‑code comments and folder naming conventions
Best For
Learning real‑world network stack optimizations and kernel‑level techniquesStudying eBPF programs and BPF tail call implementationsAnalyzing TCP connection handling and SYN flood mitigation strategiesUnderstanding I/O performance improvements with io_uring and memory refresh
FAQ
What is this repository?
It is a public GitHub repository from Cloudflare containing code samples that accompany technical blog posts on the Cloudflare blog.
What programming languages are used?
The repository is primarily C (62.1%), with Python (23.7%), and smaller amounts of LLVM, Go, Makefile, Rust, and other languages.
What topics do the code samples cover?
They cover networking, kernel internals, eBPF, TCP, memory management, I/O performance, SYN floods, kernel fuzzing, and many other systems‑level topics.
What is the license?
The repository is licensed under the BSD-3-Clause license.
How is the repository organized?
Each directory corresponds to a blog post by date and topic (e.g., 2018-03-ebpf, 2022-02-io_uring-worker-pool).