Collect, structure, and route logs from everywhere to anywhere — one unified pipeline for all your log data.

Welcome to Fluentd: Unified Logging for Cloud-Native Systems.

Fluentd is the open-source data collector for unified logging: it gathers logs and events from everywhere, parses and transforms them into a common structure, and routes them to wherever they need to go — decoupling sources from destinations. This free book teaches it from the ground up: the unified-logging model and structured-event pipeline, Fluentd's plugin architecture and tag-driven event flow, the configuration directives (source, filter, match, label), parsing and enriching data, buffering and reliability, the plugin ecosystem, Fluentd in Kubernetes (and how it compares to Fluent Bit), performance tuning and the forwarder/aggregator architecture, security, and operating it in production. Ten focused chapters with real config and clear diagrams that turn scattered, inconsistent log data into a unified, structured, reliably-delivered stream.

This title is part of the ShriIra library and is free to read in full, right here — our small contribution to making world-class knowledge easy to reach.

A note on reading it: open the Contents menu at the top of the reader to jump between chapters, use the Aa menu to set a comfortable text size, theme (light, sepia, or night), and single- or two-page layout. Your place is saved automatically, so you can always pick up where you left off.

We hope it serves you well.

— Shriira Press

Contents

1. Chapter 1 — What Fluentd Is
2. Chapter 2 — The Unified Logging Model
3. Chapter 3 — Architecture and Event Flow
4. Chapter 4 — Configuration
5. Chapter 5 — Parsing and Structuring Data
6. Chapter 6 — Buffering and Reliability
7. Chapter 7 — The Plugin Ecosystem
8. Chapter 8 — Fluentd in Kubernetes
9. Chapter 9 — Performance and Security
10. Chapter 10 — Operating Fluentd and Putting It Together