Overview

eBPF (extended Berkeley Packet Filter) is a revolutionary in-kernel virtual machine that allows developers to run sandboxed programs in a privileged context. This technology is at the forefront of modern Linux, enabling unprecedented performance, observability, and security. By programmatically extending the kernel's capabilities, eBPF provides a safe, efficient, and dynamic way to build high-performance systems without modifying the kernel source code or loading kernel modules. From high-speed container networking and load balancing to deep runtime security and system tracing, eBPF is becoming the foundational layer for cloud-native infrastructure. This book explores how this powerful technology is driving innovation in a wide range of fields. Authored by a team of engineers with hands-on experience in building and operating production eBPF systems at scale, this guide is grounded in practical, real-world applications. We draw on our deep expertise in Linux kernel programming, distributed systems, and cloud-native architecture to provide insights that are both authoritative and accessible. Our work has been battle-tested in the most demanding environments, from high-frequency trading platforms to global-scale Kubernetes clusters. The advice and techniques presented are a direct result of our experience solving complex problems and contributing to the eBPF open-source ecosystem, ensuring you get a guide that is truly credible and effective. Practical eBPF is a comprehensive, hands-on guide for developers, DevOps engineers, and SREs. This book takes you from the core concepts of eBPF and the kernel's verifier to building advanced, production-grade tools. You'll learn the eBPF development lifecycle, master essential debugging techniques, and explore its transformative role in Kubernetes networking and container security. With a focus on practical examples and modern best practices, this book empowers you to leverage eBPF for creating high-performance Linux systems, enhancing observability, and implementing robust security policies.eBPF Fundamentals: Deep dives into the eBPF architecture, maps, helpers, and the verifier. Hands-On Development: Step-by-step tutorials on writing, compiling, and loading your first eBPF programs. Advanced Techniques: Master complex topics like tail calls, program chaining, and working with kernel data structures. Cloud-Native Integration: Learn how eBPF enhances CNI (Container Network Interface) and service meshes in Kubernetes. Real-World Projects: A complete guide to building a container-aware security tool and other practical applications. Debugging and Troubleshooting: Expert strategies for debugging eBPF programs and interpreting verifier logs. Ecosystem and Community: A comprehensive overview of the eBPF foundation, community, and resources for continued learning. This book is for developers and engineers who are familiar with Linux systems and have a basic understanding of C programming. Whether you're a backend developer looking to optimize your application's performance, a security professional wanting to build next-generation defense tools, or an SRE aiming to improve system observability and troubleshooting, this guide provides the knowledge and practical skills you need. It is designed for those who want to move beyond high-level abstractions and gain a deep, technical understanding of the core of modern Linux. Don't waste countless hours sifting through fragmented online documentation and outdated tutorials. This book provides a clear, structured learning path that saves you time and accelerates your journey to eBPF mastery. Stop debugging with guesswork and start building with confidence.

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