A practical guide to low-level systems engineering, focusing on POSIX and Linux. This book provides a collection of techniques and insights I've found invaluable throughout my career—many not widely known, but useful to anyone working with systems at a low level. The chapters climb outward: how Linux runs code on a single host, the tools for seeing what it is actually doing, how data persists locally and then across the network, and finally datacenter networks and the design of systems that survive failure.

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