This is a simple hello world example to serve as a skeleton app to show your Scala code running inside a docker container
A more complex docker-compose example
It uses the sbt-native-packager plugin
First, make you you have docker installed and running
i.e. docker ps
should return the running containers on your current docker host
Then go to the root of this project and run
sbt stage docker:publishLocal
It should build and end with
[info] Built image DockerAlias(None,None,sbt-docker-helloworld,Some(1.0))
[success] ...
docker images
should show your new image, named sbt-docker-helloworld
To run
docker run -it sbt-docker-helloworld:1.1
You should see "Hello World" follow by the timestamp
Of course to run locally outside of docker, just run
sbt run
If you look inside target/docker you'll see the Dockerfile, jars,
and ENTRYPOINT binaries
If you're curious you can shell into the image and take a look around
docker run -it --entrypoint bash sbt-docker-helloworld:1.0
e.g. bin/sbt-docker-helloworld will run the scala app
You can even supply your own Dockerfile if you so wish
http://sbt-native-packager.readthedocs.io/en/latest/formats/docker.html#custom-dockerfile
In order to make Docker easier to use, I recommend the portainer container, an admin web app for Docker http://portainer.io
To read more about the sbt-native-packager Docker plugin
http://sbt-native-packager.readthedocs.io/en/latest/formats/docker.html
There is also another sbt-docker plugin