Docker – Compile maven project inside docker container & run it from there

Question

I have a project running Vue & Spring Boot that I need to create a docker-compose.yml file to run mvn clean install to generate the .jar , and then build a "new" image from another Dockerfile with that said .jar inside the docker container.

This is the Dockerfile that needs to be run once the mvn clean install is completed:

FROM java:8

ENV WKHTML_VERSION 0.12.4

# Builds the wkhtmltopdf download URL based on version numbers above
ENV DOWNLOAD_URL "https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/${WKHTML_VERSION}/wkhtmltox-${WKHTML_VERSION}_linux-generic-amd64.tar.xz"

RUN apt-get update && \
    apt-get install -y --no-install-recommends wget && \
    wget $DOWNLOAD_URL && \
    tar vxf wkhtmltox-${WKHTML_VERSION}_linux-generic-amd64.tar.xz && \
    cp wkhtmltox/bin/wk* /usr/local/bin/ && \
    cp wkhtmltox/lib/* /usr/local/lib/ && \
    rm wkhtmltox-${WKHTML_VERSION}_linux-generic-amd64.tar.xz

# @see https://spring.io/guides/gs/spring-boot-docker/
COPY   server/target/redo-server-0.0.1-SNAPSHOT.jar app.jar
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","app.jar"]

So the build steps need to be something like this:

• Install node + maven / pull those images
• Install postgresql & pull that image
• Run mvn clean install & generate .jar
• Build new image from abovementioned Dockerfile and run it

I am new to docker-compose so I am having troubles setting this up in the correct execution order.

The reason I need to do this is due to a problem with the production pipeline not having node or npm , which is needed to run the full maven application ( Vue.js and Spring Boot app), which is why it needs to be compiled from inside the Docker container

It would be greatly appreciated if anyone could point me in the right direction, let alone – is this possible to do?

Answer 1

Solved by writing a multi-step build as my Dockerfile. I am installing node as a dependency in the client's pom.xml file.

# Install maven and copy project for compilation
FROM maven:latest as builder

COPY pom.xml /usr/local/pom.xml
COPY server /usr/local/server
COPY client /usr/local/client
WORKDIR /usr/local/

RUN mvn clean install


FROM openjdk:8
ENV WKHTML_VERSION 0.12.4
# Builds the wkhtmltopdf download URL based on version numbers above
ENV DOWNLOAD_URL "https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/${WKHTML_VERSION}/wkhtmltox-${WKHTML_VERSION}_linux-generic-amd64.tar.xz"

RUN apt-get update && \
    apt-get install -y --no-install-recommends wget && \
    wget $DOWNLOAD_URL && \
    tar vxf wkhtmltox-${WKHTML_VERSION}_linux-generic-amd64.tar.xz && \
    cp wkhtmltox/bin/wk* /usr/local/bin/ && \
    cp wkhtmltox/lib/* /usr/local/lib/ && \
    rm wkhtmltox-${WKHTML_VERSION}_linux-generic-amd64.tar.xz

COPY   --from=builder /usr/local/redo/server/target/server-0.0.1-SNAPSHOT.jar app.jar
ENTRYPOINT ["java", "-Djava.security.egd=file:/dev/./urandom","-jar","app.jar"]