Dockerfile ONBUILD instruction

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The ONBUILD instruction is very useful for automating the build of your chosen software stack.

Example

The Maven container is designed to compile java programs. Magically all your project’s Dockerfile needs to do is reference the base container containing the ONBUILD intructions:

FROM maven:3.3-jdk-8-onbuild
CMD ["java","-jar","/usr/src/app/target/demo-1.0-SNAPSHOT-jar-with-dependencies.jar"]

The base image’s Dockerfile tells all

FROM maven:3-jdk-8

RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app

ONBUILD ADD . /usr/src/app

ONBUILD RUN mvn install

There’s a base image that has both Java and Maven installed and a series of instructions to copy files and run Maven.

The following answer gives a Java example

  • How to build a docker container for a java app

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