deploy java microservices in docker

Published: 03 December 2024
on channel: CodeNode
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deploying java microservices in docker involves creating a microservice application, containerizing it with docker, and then running it in a docker container. below is a step-by-step tutorial that covers these concepts, along with code examples.

prerequisites

1. **java development kit (jdk)**: ensure you have jdk 8 or later installed.
2. **maven**: install maven for building java applications.
3. **docker**: install docker on your machine.
4. **ide**: use an ide like intellij idea, eclipse, or vs code.

step 1: create a java microservice

let's start by creating a simple spring boot microservice.

1.1. create a spring boot application

you can create a spring boot application using [spring initializr](https://start.spring.io/) or through command line.

create a new directory for your project and run:



1.2. update `pom.xml`

add spring boot dependencies in the `pom.xml` file:



1.3. create the main application class

create a main application class `mymicroserviceapplication.java`:



step 2: build the java application

navigate to the project directory and run:



this will create a jar file in the `target` directory.

step 3: create a dockerfile

in the root of your project, create a file named `dockerfile`:



step 4: build the docker image

with docker installed, you can build your docker image. run the following command in the project directory where your dockerfile is located:



step 5: run the docker container

after building the image, you can run it with:



step 6: access the microservice

open your browser or use a tool like `curl` or postman to access the service:



you should see the response:



step 7: clean up

to stop the running container, you can run:



conclusion

you have now successfully created a simple java microservice using spring boot, containerized it with docker, and run it in a docker container. this tutorial can be expanded with additional microservices, using docker compose for multi-container applications, or deplo ...

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