Running Microservices in Docker

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Running Microservices in Docker

Ada Cheng's photo
Ada Cheng
·Dec 17, 2021·

2 min read

Table of contents

  • Build the microservices
  • Deployment
  • Verification

Today, I managed to run my microservices in docker environment successfully.

Build the microservices

I have written four microservices using Spring Boot. One is Eureka Server and the other three are Eureka Clients.

Docker Tag NameDescriptionPortSource Code Path
ms-server-eurekaSpring Boot Application acting as Eureka Discovery Server.8001$MS_SRC_BASE/ms.server.eureka/
ms-client-userSpring Boot Client Application connecting to MongoDB.8002$MS_SRC_BASE/ms.client.user/
ms-client-productSpring Boot Client Application connecting to MongoDB.8003$MS_SRC_BASE/ms.client.product/
ms-client-cartSpring Boot Client Application connecting to MongoDB.8004$MS_SRC_BASE/ms.client.cart/
ms-mongodbMongoDB27017NIL

Firstly, create Dockerfile for each of the microservice.

Here below is the example for the User Microservice.

FROM openjdk:17-ea-22
COPY target/ms.client.user-0.0.1-SNAPSHOT.jar ms.client.user-SNAPSHOT.jar
EXPOSE 8001
ENTRYPOINT ["java","-jar","/ms.client.user-SNAPSHOT.jar"]

Secondly, build each of the Spring Boot Applications and package to JAR files.

./mvnw -Dmaven.test.skip=true clean package

Thirdly, build docker image of each of the Spring Boot Applications.

*Make sure Docker Engine is running on your development host.

cd $MS_SRC_BASE/ms.server.eureka/
docker build --tag=ms-server-eureka:latest .
cd $MS_SRC_BASE/ms.client.user/
docker build --tag=ms-client-user:latest .
cd $MS_SRC_BASE/ms.client.product/
docker build --tag=ms-client-product:latest .
cd $MS_SRC_BASE/ms.client.cart/
docker build --tag=ms-client-cart:latest .

Deployment

  • In order that the containers can find each other, use --network container:[containerName] to bind to a master container. In this case, I use ms-server-eureka as the master container.
  • All ports are exposed by publishing the ports on the master container.
docker run --name ms-server-eureka -p 8000-8003:8000-8003 -p 27017:27017 ms-server-eureka:latest
docker run --name ms-mongodb --network container:ms-server-eureka -d mongo
docker run --name ms-client-user --network container:ms-server-eureka ms-client-user:latest
docker run --name ms-client-product --network container:ms-server-eureka ms-client-product:latest
docker run --name ms-client-cart --network container:ms-server-eureka ms-client-cart:latest

Verification

  • Check the Eureka Server status by opening http://localhost:8000/ in a web browser.

    20211217-Eureka.png

  • Get data from the User Microservice by opening http://localhost:8001/user/search/findByLastName?name=Administrator in a web browser.

    User Microservice

 
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