Repository Summary

• Docker
• Docker Compose
• Microservices-architecture (Spring Boot - Java Framework)
• Microservices Communication using Feign client as REST client
• H2 In-Memory Database (one service one H2 In-Memory Database)
• Platform-Provided Service Discovery (Deployment infrastructure take care of service discovery)
• Service-discovery (Docker-DNS)
• API-gateway (NGINX)
• Using NGINX in the backend as a reverse proxy
• Shell Scripting

Microservices Demo

Restaurant application implemented in spring boot framework. NGINX is used as API Gateway and Docker DNS service as service discovery.

In order to set up infrastructure run the following command:

docker-compose up --build

Application testing is available via web_requests.sh script.

web_requests.sh

In order to destroy infrastructure run the following command:

docker-compose down -v

spring-nginx-dns Instructions

Start Docker Daemon: If you're using Docker for Windows, Then simply start the desktop app installed in:

C:\Program Files\Docker\Docker\Docker Desktop.exe

Position yourself using Git Bash in the folder where docker-compose.yml file is:

cd DOCKER-COMPOSE_FILE_PATH

Mapping environment variables from the environment file to the docker-compose.yml file (Check how your docker-compose.yml will finally look like, after environment variables substitution)

docker-compose --env-file .env config

To set up infrastructure run the following command in Git Bash:

docker-compose up --build

Docker-compose services/containers listing (one service one container)

docker-compose ps

docker ps

Request: GET http://localhost:8080/api/consumer/hello

http://localhost:8080/api/consumer/hello

Response:

Hello from consumer service with ip address 172.18.0.3!

Request: GET http://localhost:8080/api/kitchen/hello

http://localhost:8080/api/kitchen/hello

Response:

Hello from kitchen service with ip address 172.18.0.4!

Request: GET http://localhost:8080/api/order/hello

http://localhost:8080/api/order/hello

Response:

Hello from order service with ip address 172.18.0.2!

Fill H2 In-Memory Database with data using shell script. Run the following command in Git Bash

./web_requests.sh

Request: GET http://localhost:8080/api/consumer/verify/1

http://localhost:8080/api/consumer/verify/1

Response:

true

Check if data is added to H2 In-Memory Database using the H2 dashboard

Consumer-Service H2 In-Memory Database

http://localhost:9000/h2-console

JDBC URL:jdbc:h2:mem:myDb → paste jdbc:h2:mem:myDb  → Test Connection  → Connect → Click CONSUMER table → Run

Order-Service H2 In-Memory Database

http://localhost:9001/h2-console

JDBC URL:jdbc:h2:mem:myDb → paste jdbc:h2:mem:myDb  → Test Connection  → Connect → Click ORDER table → Run

Kitchen-Service H2 In-Memory Database

http://localhost:9002/h2-console

JDBC URL:jdbc:h2:mem:myDb → paste jdbc:h2:mem:myDb  → Test Connection  → Connect → Click TICKET table → Run

To destroy infrastructure run the following command in Git Bash:

docker-compose down -v