Containerize Java

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 Containerize The Java Application Using Docker




Maven Install

we need to install the maven it is important to create the jar file of our application.

  • Open your terminal ubuntu or WSL and run this command to check the maven presence.

  ✨ $ mvn -v

  • If the maven doesn’t install in the system install using this.

 ✨ $ sudo apt install maven


  • It will install the maven in our system once installation is finished recheck the installation using above mvn -v command.

Go where pom.xml file is present in your application locate that folder and run this command to create the jar file of application

 ✨ $ maven clean package

  • First it compiles our code.
  • It create the jar file of the application in target folder of the application folder.

Docker File

That’s all now we can create the docker file.

  • Open any text editor and create file name without any extension of this name Dockerfile.
  • File name must same like this. if any typo on this name docker won’t build image.
FROM baseimage:tag
RUN apk update && apk add openjdk17-jre
ENV PATH="/usr/lib/jvm/java-17-openjdk-amd64/bin:${PATH}"
COPY target/[appname-0.0.1-SNAPSHOT.jar] [New-Name].jar
EXPOSE 8080
CMD ["java", "-jar", "[New-Name].jar"]

It is the sample Dockerfile for the application.

 ✨ FROM → It is the base image from the docker hub and tag of the image.

 ✨ RUN → It add the JDK to the image that help to run the any java application.

 ✨ ENV → This set the path for JDK installation.

 ✨ COPY → It copy our application jar file inside the image.

 ✨ EXPOSE → It will expose the image on default port number. It help to run a container.

✨ CMD → Finally this run the application whenever containers are created.

Docker image

Open the Terminal and go to the root directory where Dockerfile rely on. Now run this command to build a image.

 ✨ $ docker build -t [image-name]:tag [Dockerfile-PATH]

  • It build the image from the Dockerfile.
  • image is build check the image using this command.

✨ $ docker images

Docker Container

Now time to run the application in a container.

 

✨ $ docker run --name [container-name:tag] -p [EXPOSE-port:port-want-to-run] -d [image-name:tag]

That’s all now the application will run on the container port you don’t need to run a application in IDE anymore.

If you want to publish your application or share your work follow the below steps.

Publish the image

  • If you don’t have Docker Hub account create one, if you have login into account.
  • Create a New Repository.

If you want to be easy Pushing rename the image with similar to the [USERNAME/REPOSITORY] name that similar to the Docker Hub.

Now open the terminal and use this command.

✨ $ docker push [username/repositoryname]:tag

It’s Done making it public any one have the docker hub account in the world can access pull our image and use the application from creating the container.


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