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Microservices with Netflix OSS, Apache Kafka and Spring Boot

Simple system mixing the two main ways for communication between microservices: REST and messaging.

Components

  1. Service registry (Eureka) — Where all services will register themselves
  2. Config server (Spring Cloud Config) — Where all services will take their configurations from. Config server will keep configuration files in git repository
  3. Gateway (Zuul) — that will redirect all the requests to the needed microservice
  4. User service — using this one the new users will register. On every new registration the User service will send a message “USER_REGISTERED” to the message broker (Kafka)
  5. Email service — using this one we will send emails. On “USER_REGISTERED”message received the Email service will send a confirmation email to the new user

Requirements

The asynchronous communication is performed through Apache Kafka, therefore first it must be started

Kafka uses ZooKeeper so you need to first start a ZooKeeper server if you don't already have one.

> bin/zookeeper-server-start.sh config/zookeeper.properties

Now start the Kafka server:

> bin/kafka-server-start.sh config/server.properties

Example of usage

  1. Start the Service registry (ms-discovery)
  2. Start the Config server (ms-config-server)
  3. Start the Gateway (ms-gateway)
  4. Start the User service (ms-user)
  5. Start the Mail service (ms-mail)
  6. Register a new user
curl -X POST \
  http://localhost:8765/api/user \
  -H 'Content-Type: application/json' \
  -H 'cache-control: no-cache' \
  -d '{
	"username": "[email protected]",
	"password": "mynewpass"
}'
  1. Validate that the new user has been registered on User service
  2. Validate that a new mail has been received on [email protected] account