Distributed Systems with Node.js

Cover

Copyright

Table of Contents

Foreword

Preface

Target Audience

Goals

Conventions Used in This Book

Using Code Examples

O'Reilly Online Learning

How to Contact Us

Acknowledgments

Chapter 1. Why Distributed?

The Single-Threaded Nature of JavaScript

Quick Node.js Overview

The Node.js Event Loop

Event Loop Phases

Code Example

Event Loop Tips

Sample Applications

Service Relationship

Producer Service

Consumer Service

Chapter 2. Protocols

Request and Response with HTTP

HTTP Payloads

HTTP Semantics

HTTP Compression

HTTPS / TLS

JSON over HTTP

The Dangers of Serializing POJOs

API Facade with GraphQL

GraphQL Schema

Queries and Responses

GraphQL Producer

GraphQL Consumer

RPC with gRPC

Protocol Buffers

gRPC Producer

gRPC Consumer

Chapter 3. Scaling

The Cluster Module

A Simple Example

Request Dispatching

Cluster Shortcomings

Reverse Proxies with HAProxy

Introduction to HAProxy

Load Balancing and Health Checks

Compression

TLS Termination

Rate Limiting and Back Pressure

SLA and Load Testing

Introduction to Autocannon

Running a Baseline Load Test

Reverse Proxy Concerns

Protocol Concerns

Coming Up with SLOs

Chapter 4. Observability

Environments

Logging with ELK

Running ELK via Docker

Transmitting Logs from Node.js

Creating a Kibana Dashboard

Running Ad-Hoc Queries

Metrics with Graphite, StatsD, and Grafana

Running via Docker

Transmitting Metrics from Node.js

Creating a Grafana Dashboard

Node.js Health Indicators

Distributed Request Tracing with Zipkin

How Does Zipkin Work?

Running Zipkin via Docker

Transmitting Traces from Node.js

Visualizing a Request Tree

Visualizing Microservice Dependencies

Health Checks

Building a Health Check

Testing the Health Check

Alerting with Cabot

Create a Twilio Trial Account

Running Cabot via Docker

Creating a Health Check

Chapter 5. Containers

Introduction to Docker

Containerizing a Node.js Service

Dependency Stage

Release Stage

From Image to Container

Rebuilding and Versioning an Image

Basic Orchestration with Docker Compose

Composing Node.js Services

Internal Docker Registry

Running the Docker Registry

Pushing and Pulling to the Registry

Running a Docker Registry UI

Chapter 6. Deployments

Build Pipeline with Travis CI

Creating a Basic Project

Configuring Travis CI

Testing a Pull Request

Automated Testing

Unit Tests

Integration Tests

Code Coverage Enforcement

Deploying to Heroku

Create a Heroku App

Configure Travis CI

Deploy Your Application

Modules, Packages, and SemVer

Node.js Modules

SemVer (Semantic Versioning)

npm Packages and the npm CLI

Internal npm Registry

Running Verdaccio

Configuring npm to Use Verdaccio