Microservices Architecture with MongoDB

This repository contains a set of templates to help you create a Java Spring Boot microservices architecture with MongoDB.

In this repo you'll find:

• A config-server on port 8888
• A service-registry on port 8761
• An api-gateway on port 8080
• Two microservices:
  • company-service on port 8081
  • employee-service on port 8082

Prerequisites

• Docker (for local ephemeral MongoDB nodes or you can use MongoDB Atlas)
• Java 21
• Maven 3.6.3+

Getting Started

MongoDB

Microservices are supposed to be independent of each others. For this reason, we need two MongoDB instances: one for each microservice.

With Docker

The following script will start two local single node replica set nodes on port 27017 and 27018.

./1_docker-start-mongodb.sh

When you are done:

./3_docker-stop-mongodb.sh

With MongoDB Atlas

You can create two tests clusters on MongoDB Atlas and overwrite the default MongoDB URIs before starting the two microservices.

For the company_service use:

export MONGODB_URI_1="ATLAS_URI_HERE"

For the employee_service use:

export MONGODB_URI_2="ATLAS_URI_HERE"

Start Spring Boot projects

Open five terminals: one for each folder.

Before we start the microservices, we need to retrieve their config repository:

git clone git@github.com:mongodb-developer/microservices-architecture-mongodb-config-repo.git

Update the file config-server/src/main/resources/application.properties so this property points to the config repo.

spring.cloud.config.server.git.uri=${HOME}/Work/microservices-architecture-mongodb-config-repo

Now we can start the Spring Boot projects.

Start with the config-server as the microservices need this one running to be able to retrieve their configuration.

cd config-server
mvn clean spring-boot:run

cd service-registry
mvn clean spring-boot:run

cd company-service
export MONGODB_URI_1="ATLAS_URI_HERE" # optional
mvn clean spring-boot:run

cd employee-service
export MONGODB_URI_2="ATLAS_URI_HERE" # optional
mvn clean spring-boot:run

cd api-gateway
mvn clean spring-boot:run

Test the REST APIs

The api-gateway running on port 8080 can distribute the queries to the relevant microservices.

You can test all the APIs using the script:

./2_api-tests.sh

Note that the script is only targeting the port 8080 of the api-gateway.