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4. Creating Dockerfile

info

A Dockerfile is a script that contains a collection of instructions for building your Docker image. It specifies the base OS, Java runtime, and how to execute your application.

Creating the File​

Create the file quickly using the touch command inside your Codespaces terminal:

touch Dockerfile

Dockerfile Creation

Once done, you will see a Dockerfile built right in your project sidebar.

Dockerfile Configuration​

Open that empty file and paste the following configuration:

FROM eclipse-temurin:17-jre

WORKDIR /app

COPY target/bigkart-0.0.1-SNAPSHOT.jar app.jar

EXPOSE 8080

ENTRYPOINT ["java", "-jar", "app.jar"]

Save and close this file.

tip

To check what each command does, refer to Understanding DockerFile Commands.

Now proceed to Creating DockerHub Account & Repo.