Skip to main content

Packaging Scala applications as Docker images

Scala CLI can create an executable application and package it into a Docker image.

For example, here's a simple piece of code that will be executed in a Docker container:

HelloDocker.scala
object HelloDocker extends App {
    println("Hello from Docker")
}

Passing --docker to the package sub-command generates a Docker image. When creating a Docker image, the --docker-image-repository parameter is mandatory.

The following command generates a hello-docker image with the latest tag:

scala-cli package --docker HelloDocker.scala --docker-image-repository hello-docker
docker run hello-docker
# Hello from Docker

You can also package your app in the Scala.js or Scala Native environments. For example, this command creates a Scala.js Docker image:

scala-cli package --js --docker HelloDocker.scala --docker-image-repository hello-docker

This command creates a Scala Native Docker image:

scala-cli package --native --docker HelloDocker.scala --docker-image-repository hello-docker
note

Packaging a Scala Native application to a Docker image is supported only on Linux.