Docker multi-stage builds

Docker 17.06 introduced a new feature, Multi-stage builds, check the Docker blog entry multi stage builds or new multistage builds section in the docker official documentation for more details.

I tried to add a multi-stage Dockefile to build my sample project angularjs-springmvc-sample-boot into Docker images and run it in Docker container.

FROM node:latest AS ui
WORKDIR /usr/src/ui
COPY package.json .
# Setup NPM mirror, optionally for China users.
# RUN npm config set registry https://registry.npm.taobao.org/ 
RUN npm install 
COPY . .
RUN node_modules/.bin/bower install --allow-root
RUN node_modules/.bin/gulp

FROM maven:latest AS boot
WORKDIR /usr/src/app
COPY pom.xml .
# COPY settings.xml /usr/share/maven/ref/settings-docker.xml
RUN mvn -B -f pom.xml -s /usr/share/maven/ref/settings-docker.xml dependency:resolve
COPY . .
RUN mvn -B -s /usr/share/maven/ref/settings-docker.xml clean package -DskipTests
 
FROM java:8-jdk-alpine
WORKDIR /static
COPY --from=ui /usr/src/ui/dist/ .
WORKDIR /app
COPY --from=boot /usr/src/app/target/angularjs-springmvc-sample-boot.jar .
ENTRYPOINT ["java", "-jar", "/app/angularjs-springmvc-sample-boot.jar"]

There are multi FROM in this Dockerfile, the AS is use for naming a stage.
In the final stage, COPY command accepts a --from parameter to refer a former stage.
In our Dockerfile:

ui build the frontend codes into dist folder.
boot build the Spring Boot based backend codes into a jar.
The final stage will run this project.

Follow the Docker Toolbox notes and create a new docker machine for test purpose.
Build docker image.

docker build -t angularjs-springmvc-multistage .

Run angularjs-springmvc-multistage in docker container.

docker run -it --rm -p 9000:9000  angularjs-springmvc-multistage

Open your browser, and navigate http://docker-machine ip:9000.

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