Book Image

Practical Microservices with Dapr and .NET

By : Davide Bedin
Book Image

Practical Microservices with Dapr and .NET

By: Davide Bedin

Overview of this book

Over the last decade, there has been a huge shift from heavily coded monolithic applications to finer, self-contained microservices. Dapr is a new, open source project by Microsoft that provides proven techniques and best practices for developing modern applications. It offers platform-agnostic features for running your applications on public cloud, on-premises, and even on edge devices. This book will help you get to grips with microservice architectures and how to manage application complexities with Dapr in no time. You'll understand how Dapr offers ease of implementation while allowing you to work with multiple languages and platforms. You'll also understand how Dapr's runtime, services, building blocks, and software development kits (SDKs) help you to simplify the creation of resilient and portable microservices. Dapr provides an event-driven runtime that supports the essential features you need to build microservices, including service invocation, state management, and publish/subscribe messaging. You'll explore all of those in addition to various other advanced features with this practical guide to learning Dapr. By the end of this book, you'll be able to write microservices easily using your choice of language or framework by implementing industry best practices to solve problems related to distributed systems.

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Table of Contents (16 chapters)
Preface
Preface
Who this book is for
What this book covers
To get the most out of this book
Download the example code files
Download the color images
Conventions used
Get in touch
Reviews
1
Section 1: Introduction to Dapr
Section 1: Introduction to Dapr
Free Chapter
2
Chapter 1: Introducing Dapr
Chapter 1: Introducing Dapr
Technical requirements
An overview of Dapr
The architecture of Dapr
Setting up Dapr
Building our first Dapr sample
Summary
3
Chapter 2: Debugging Dapr Solutions
Chapter 2: Debugging Dapr Solutions
Technical requirements
Configuring Dapr debug in VS Code
Debugging a Dapr multi-project solution
Using Tye with Dapr
Summary
4
Section 2: Building Microservices with Dapr
Section 2: Building Microservices with Dapr
5
Chapter 3: Service-to-Service Invocation
Chapter 3: Service-to-Service Invocation
Technical requirements
How services work in Dapr
Service invocation with the .NET SDK
HTTP and gRPC for Dapr services
Summary
6
Chapter 4: Introducing State Management
Chapter 4: Introducing State Management
Technical requirements
Managing state in Dapr
Stateful services in an e-commerce ordering system
Azure Cosmos DB as a state store
Summary
7
Chapter 5: Publish and Subscribe
Chapter 5: Publish and Subscribe
Technical requirements
Using the pub/sub pattern in Dapr
Using Azure Service Bus in Dapr
Implementing a saga pattern
Summary
8
Chapter 6: Resource Bindings
Chapter 6: Resource Bindings
Technical requirements
Learning how to use Dapr bindings
Using Twilio output bindings in Dapr
Ingesting data in C# with the Azure Event Hubs input binding
Summary
9
Chapter 7: Using Actors
Chapter 7: Using Actors
Technical requirements
Using actors in Dapr
Actor lifetime, concurrency, and consistency
Implementing actors in an e-commerce reservation system
Summary
10
Section 3: Deploying and Scaling Dapr Solutions
Section 3: Deploying and Scaling Dapr Solutions
11
Chapter 8: Deploying to Kubernetes
Chapter 8: Deploying to Kubernetes
Technical requirements
Setting up Kubernetes
Setting up Dapr on Kubernetes
Deploying a Dapr application to Kubernetes
Exposing Dapr applications to external clients
Summary
12
Chapter 9: Tracing Dapr Applications
Chapter 9: Tracing Dapr Applications
Technical requirements
Observing applications in Dapr
Tracing with Zipkin
Analyzing metrics with Prometheus and Grafana
Summary
13
Chapter 10: Load Testing and Scaling Dapr
Chapter 10: Load Testing and Scaling Dapr
Technical requirements
Scaling Dapr on Kubernetes
Load testing with Locust
Load testing Dapr
Autoscaling with KEDA
Summary
14
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Appendix – Microservices Architecture with Dapr
Appendix – Microservices Architecture with Dapr
Discovering microservices
Adopting microservices patterns
Building an e-commerce architecture
Building microservices with Dapr
Summary

Tracing with Zipkin

Zipkin is an open source distributed tracing system. It offers the ability to search for traces by identifier (ID), service, operation, or tags, and shows the dependencies between services. You can learn more at https://zipkin.io/.

These are the steps we will follow to set up Zipkin in Dapr on Kubernetes:

  1. Setting up Zipkin
  2. Configuring tracing with Zipkin
  3. Enabling tracing in Dapr
  4. Investigating with Zipkin

Let's start by installing Zipkin in the cluster we prepared in Chapter 8, Deploying to Kubernetes.

Setting up Zipkin

Zipkin is distributed as a Docker container. You probably already have it on your local development environment, as it has been installed by default with Dapr.

We can deploy it to Kubernetes with the following Deploy\zipkin.yaml file:

apiVersion:  apps/v1
kind:  Deployment
metadata:
    name:  zipkin
    labels:
   &...
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