How to Deploy a Java Web App to Cube with Docker: Step‑by‑Step Guide

The video demonstrates a typical Java application (a cloud‑gaming demo) and explains how to package it into a Docker image and run it on Cube.

Key Steps

Understand Docker basics

Prepare the environment

Apply for a Uhub account and create an image repository.

Set up Java build tools and Docker, then log in to Uhub.

Prepare the Dockerfile

FROM uhub.service.ucloud.cn/hello/maven:3-jdk-8-alpine
WORKDIR /usr/src/app
# Replace with your own jar/war filename
COPY target/cloudgame-0.0.1-SNAPSHOT.war /usr/src/app
# Open port if exposing externally (adjust firewall)
ENV PORT 8080
EXPOSE $PORT
# Adjust memory as needed (slightly less than Cube limit)
CMD [ "sh", "-c", "java -Xmx3072M -jar /usr/src/app/cloudgame-0.0.1-SNAPSHOT.war -Dserver.port=${PORT}" ]

Build the Docker image and push to Uhub

docker build -t uhub.service.ucloud.cn/gary/cloudgame-image:mytag .
docker push uhub.service.ucloud.cn/gary/cloudgame-image:mytag

Next steps

Continue improving the image.

Integrate it into a CI/CD pipeline for automated deployment.

If you encounter any issues during the process, feel free to leave a comment for discussion.