sbt-docker-helloworld

This is a simple hello world example to serve as a skeleton app to show your Scala code
running inside a docker container

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

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

There is also another sbt-docker plugin