MICROSERVICES WITH SPRING BOOT, EUREKA AND DOCKER - PART 1

HOW TO COMMUNICATE SPRING BOOT MICROSERVICES WITHIN THE SAME DOCKER NETWORK?

FIRST THINGS FIRST, WE NEED TO CREATE OUR DOCKER NETWORK.

NOW WE NEED TO SET-UP THE DOCKERFILE.

WILL LOOK LIKE THIS INSIDE THE CONTAINER:

/app
├── .mvn/
├── pom.xml
├── target/
│ └── [compiled JAR files and other build artifacts]
└── src/

NOW WE NEED TO BUILD AND RUN OUR DOCKER CONTAINER:

"DOCKER BUILD ." WILL CREATE YOUR IMAGE THEN YOU RUN IT WITH:

REMEMBER TO RUN YOUR CONTAINER WITH THE SAME NETWORK YOU JUST CREATED. IT WILL PROBABLY FAIL TO RUN SO STOP THE CONTAINER FOR NOW.

CONFIGURING OUR SPRING BOOT APPLICATIONS

DISCOVERY/SERVICE-REGISTRY

REMEMBER TO ANNOTATE YOUR MAIN JAVA CLASS WITH @EnableEurekaServer

I RECOMMEND YOU TO NOT USE THE IPV4 BECAUSE EVERYTIME YOU REASSIGN YOUR CONTAINER TO THE NETWORK THE IP WILL CHANGE. USE THE DOCKER CONTAINER INSTEAD.

http://YOUR_CONTAINER_NAME:8761/eureka/

HOW TO GET THE APPLICATION CONTAINER IPV4?

GATEWAY CONFIGURATION

ON "serviceUrl.defaultZone" USE THE NETWORK IPV4 FROM THE DISCOVERY/SERVICE-REGISTRY CONTAINER OR JUST USE THE CONTAINER NAME(its better trust me).

CREATE YOUR DOCKERFILE FOR THE GATEWAY TOO AND MAKE SURE TO SET-UP YOUR PORTS CORRECTLY FOR THE CONTAINERS. IN THIS CASE WOULD LOOK LIKE THIS:

docker run --name CONTAINER_NAME --network=YOUR_NETWORK_NAME -p 8080:8080 YOUR_DOCKER_IMAGE_NAME

NOW YOU ONLY THE GATEWAY TO RECEIVE CONNECTIONS FROM THE OUTSIDE.