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Builder

We want to create a volume so that when gradle downloads dependencies it doesn't need to do it again if the source folder gets updated.

docker volume create gradle-dependencies

Create a volume that will hold the all the source and build artifcats in a volume

docker volume create build-$USER

Full paths are required for docker. You'll need to adjust this path based on your environment.

export PROJECT_DIR="/home/${USER}/workspace/docker-builder-pattern-example/"

Build the builder

This assembles the builder image

docker build --tag builder builder

Test the builder

The preflight.sh will check to make sure the environment is correct and print a lot of settings.

docker run -ti \
  --mount type=volume,source=build-${USER},target=/build \
  builder /preflight.sh

Build the server with the Builder

Mount in the build.sh to execute the build and the source and gradle-dependencies.

docker run -ti \
  --mount type=bind,source="${PROJECT_DIR}/",target=/source \
  --mount type=volume,source=gradle-dependencies,target=/gradle-dependencies \
  --mount type=volume,source=build-${USER},target=/build \
  builder /build.sh server

Results

This ends up building the binary '/build/server/build/libs/server-0.0.1-SNAPSHOT.jar' which then need to be extracted. Subsequent builds will be faster as you don't have to download the dependencies for gradle again. The issue is now you have to exact the binary from the volume or mount the volume in another container to run it.

Execute the binary from the volume inside of a small alpine image.

docker run --rm \
  -p 8080:8080 \
  --mount type=volume,source=build-${USER},target=/build \
  openjdk:14-alpine java -jar /build/server/build/libs/server-0.0.1-SNAPSHOT.jar

Access the server

curl -i -w '\n' http://localhost:8080/server/v1/acknowledge

Clean up

We left some volumes hanging out

docker volume rm --force build-${USER}
docker volume rm --force gradle-dependencies
docker image rmi --force server:latest
docker image rmi --force builder:latest