Deep dives into DevOps and server-side topics, combining theory with hands-on examples. Run every command in an attached remote playground, from your browser or local terminal over SSH — no setup required.
Learn how servers actually work by building a tiny TCP server and client from scratch. A hands-on introduction to sockets, TCP, and the network programming model every backend, DevOps, and platform engineer should go through at least once.
Discover how Go functions under the hood as a modern systems programming language. Learn how Go makes system calls directly, resulting in self-contained binaries that have no libc dependencies.
Explore what a program is, when it actually becomes a process and how the Linux scheduler manages process execution.
Explore what a thread actually is in Linux, how threads relate to processes, how the Linux kernel treats both as tasks (task_struct), and how kernel scheduling enables concurrency.
Explore Linux/Unix signals in Go, how signals act as asynchronous notifications, who can send them, default kernel behaviors, sending signals with kill and Go, graceful signal handling with os/signal, and why SIGKILL cannot be trapped.
Explore what a computer, CPU architecture, and kernel are, learn the history and family of Assembly ISAs, compare CISC vs RISC, and write your first x86_64 assembly "Hello, World!" program.
Walk through the C compilation pipeline: preprocessor, compiler, assembler, and linker. Start with a normal hello world, inspect macros and generated assembly, and end by producing a running binary that has no main() function.
In this tutorial you will learn different ways to implement loops in eBPF, explaining how iteration evolved from manual loop unrolling to modern mechanisms like bounded loops, helper functions, and open-coded iterators. It walks through the limitations, kernel version requirements, and practical examples for each approach so you can choose the most appropriate looping method for your eBPF programs.
In this tutorial, you’ll learn how eBPF applications send kernel events into user space using perf buffer and ring buffer, exploring their design, trade-offs, and performance implications. You’ll also learn how moderns solutions like Jibril handle high-throughput event delivery.
In this tutorial, you will learn how to build a IPIP DSR load balancer using eBPF/XDP, where backends from arbitrary networks send responses directly back to clients bypassing the load balancer.
Learn how an eBPF/XDP-based NAT Layer 4 load balancer works by building one from scratch. We implement simple connection tracking, deterministic hashing, and IP/MAC rewriting with a small, easy-to-follow example.
Learn how to build an eBPF/XDP firewall that filters packets by IP ranges using BPF_MAP_TYPE_LPM_TRIE and longest-prefix matching.
In this tutorial, you’ll learn the fundamentals of eBPF and XDP through example code that parses packets across different protocol layers, demonstrates how XDP actions work, and shows how these building blocks form the foundation for high-performance networking applications.
In this tutorial, we look at why eBPF programs can fail across kernel versions due to changes in structs, tracepoints, and function layouts. We look at examples of how these differences cause portability issues and how BPF CO-RE, BTF and vmlinux.h address them.
In this tutorial, you’ll learn how to make your eBPF programs portable across kernels that lack built-in BTF support.
In this tutorial, we’ll look at how different eBPF tracing mechanisms work in practice by focusing on a single use case: capturing execve system call events. We’ll start with tracepoints, move on to raw tracepoints, and then cover kprobes and fprobes, showing how each attaches to the kernel and what data they expose. Along the way, we’ll compare their trade-offs in terms of stability, performance, and portability.
In this tutorial, you’ll learn why it is safe to run eBPF code in the kernel, some of its advantages compared to kernel modules, and why the verifier is the most crucial component of eBPF.
In this tutorial, you’ll learn how to inspect eBPF programs and maps loaded into the kernel with bpftool, gaining deeper visibility into how your eBPF application runs. We’ll also explore bpftop, a top-like interface that lets you monitor eBPF program activity in real time.
In this tutorial, you’ll learn how to store and update data inside the kernel, turning a simple eBPF Hello World program into one that tracks useful state. We’ll also briefly learn a few basics of bpftool, a handy CLI tool that will allow us to list and inspect our eBPF map.
In this first tutorial, you’ll run a pre-coded eBPF program and see it in action without writing any code yourself. We’ll walk through the important parts of the program so you understand how eBPF hooks and runs in the kernel. The goal is to get familiar with the workflow and core concepts before you start writing your own eBPF programs.
