Skip to main content

3. Creating Dockerfile

info

Even though the build process is fully automated via CI/CD, GitHub Actions still requires a Dockerfile in the root of the repository to understand how to construct the image.

Creating the File​

Create the file quickly using the touch command inside your project:

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. Ensure it gets committed to the repository so the pipeline can access it!

tip

To deeply understand what each line in this file does, check this optional reference: Understanding DockerFile Commands.