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Creating Docker Image of the Back-end

This document provides instructions on setting up a Docker container for the Crowdfunding project. The Dockerfile is based on the gradle:8.1.1-jdk17 image, and it uses the Crowdfund-0.0.1-SNAPSHOT.jar file built with Gradle.

Dockerfile Configuration​

Below is the configuration for the Dockerfile with explanations added:

Dockerfile
# Use Gradle image to build and run the application in the same stage
FROM gradle:8.1.1-jdk17

# Set the working directory
WORKDIR /opt/app

# Copy the entire project into the container
COPY --chown=gradle:gradle . .

# Build the application and create the JAR file
RUN gradle build --no-daemon -x test

# I added this so that it uses the file application-docker.properties instead of the local setup
ENV PROFILE=docker

# Set the entry point to run the application
ENTRYPOINT ["sh", "-c", "java -Dspring.profiles.active=${PROFILE} -jar build/libs/Crowdfund-0.0.1-SNAPSHOT.jar"]

How to create the image​

Once the Dockerfile is set up, you can build the Docker image for your application by running the following command in the root of your project (where the Dockerfile is located):

docker build -t <image_name> .

Explanation​

  • docker build: The command used to create a Docker image from the Dockerfile.
  • -t image_name: This option tags the image with the name <image_name>.
  • .: The dot indicates the build context is the current directory, where Docker will look for the Dockerfile and other files.

Verify the Image​

After building the image, verify its existence by listing all Docker images or check in Docker Desktop:

docker images

You should see <image_name> in the output, indicating the image was successfully built.

Creating and running the Docker Container​

  • Run the container with the environment variables: 
    docker run -d --name raisehub_backend_container -e JWT_SECRET=<value> -e MYSQL_USERNAME=<value> -e MYSQL_PASSWORD=<value>  -p 8080:8080 <image_name>

You can review the environment variables here

You now have a container called raisehub_backend_container running the image <image_name>.

The application will be accessible at http://localhost:8080 by default.