Docker base configuration for Scala projects with Docker (tested against Docker Beta for OS X)

README.md

How to run

$ docker-compose build
$ docker-compose run scala sbt compile
$ docker-compose run scala sbt run
$ docker-compose run scala sbt test
$ docker-compose run scala sbt "~ test" # to run continuously
$ docker-compose run scala # to access Docker's Machine
$ docker-compose run scala sbt ~compile # similar to test above. Works with and without quotes

First run information

It may take a while to fetch all dependencies (libs) based on what's inside your|project build.sbt project file. This configuration shares a local .sbt and .ivy2 directories with Docker's Container /root/.sbt and /root/.ivy2 directories. With sharing, sbt will find your dependencies' cache and will not re-download everything again.

This Dockerfile is based on Scala-sbt Dockerfile from Docker Hub

Tips & Tricks

Put both .sbt and .ivy2 directories under your .gitignore file.

To update Scala/SBT to latest version, remember to remove the old image. You can find it $ docker images and remove the base image named hseeberger/scala-sbt using command $ docker rmi <image-hash-id>, then, build again. You can check which is the latest version here Scala-sbt Dockerfile from Docker Hub

docker-compose.yml

version: '2'

services:
  scala:
    build: .
    volumes:
      - .:/exampleapp
      - ./.ivy2:/root/.ivy2
      - ./.sbt:/root/.sbt

Dockerfile

FROM hseeberger/scala-sbt
# For a Alpine Linux version, comment above and uncomment below:
# FROM 1science/sbt

RUN mkdir -p /exampleapp
RUN mkdir -p /exampleapp/out

WORKDIR /exampleapp

COPY . /exampleapp

Shouldn't the WORKDIR instruction be after the COPY in the Dockerfile?