How to use Docker in sbt-native-packager 0.8.0-M2 with Play

Question

I am trying to build a Docker image on a Play 2.2 project. I am using Docker version 1.2.0 on Ubuntu Linux.

My Docker specific settings in Build.scala looks like this:

dockerBaseImage in Docker := "dockerfile/java:7"
maintainer in Docker := "My name"
dockerExposedPorts in Docker := Seq(9000, 9443)
dockerExposedVolumes in Docker := Seq("/opt/docker/logs")

Generated Dockerfile:

FROM dockerfile/java:latest
MAINTAINER 
ADD files /
WORKDIR /opt/docker
RUN ["chown", "-R", "daemon", "."]
USER daemon
ENTRYPOINT ["bin/device-guides"]
CMD []

Output looks like the dockerBaseImage is being ignored, and the default

(dockerfile/java:latest) is not handled correctly:
[project] $ docker:publishLocal
[info] Wrote /..../project.pom
[info] Step 0 : FROM dockerfile/java:latest
[info]  ---> bf7307ff060a
[info] Step 1 : MAINTAINER
[error] 2014/10/07 11:30:12 Invalid Dockerfile format
[trace] Stack trace suppressed: run last docker:publishLocal for the full output.
[error] (docker:publishLocal) Nonzero exit value: 1
[error] Total time: 2 s, completed Oct 7, 2014 11:30:12 AM
[project] $ run last docker:publishLocal
java.lang.RuntimeException: Invalid port argument: last
    at scala.sys.package$.error(package.scala:27)
    at play.PlayRun$class.play$PlayRun$$parsePort(PlayRun.scala:52)
    at play.PlayRun$$anonfun$play$PlayRun$$filterArgs$2.apply(PlayRun.scala:69)
    at play.PlayRun$$anonfun$play$PlayRun$$filterArgs$2.apply(PlayRun.scala:69)
    at scala.Option.map(Option.scala:145)
    at play.PlayRun$class.play$PlayRun$$filterArgs(PlayRun.scala:69)
    at play.PlayRun$$anonfun$playRunTask$1$$anonfun$apply$1.apply(PlayRun.scala:97)
    at play.PlayRun$$anonfun$playRunTask$1$$anonfun$apply$1.apply(PlayRun.scala:91)
    at scala.Function7$$anonfun$tupled$1.apply(Function7.scala:35)
    at scala.Function7$$anonfun$tupled$1.apply(Function7.scala:34)
    at scala.Function1$$anonfun$compose$1.apply(Function1.scala:47)
[trace] Stack trace suppressed: run last compile:run for the full output.
[error] (compile:run) Invalid port argument: last
[error] Total time: 0 s, completed Oct 7, 2014 11:30:16 AM

What needs to be done to make this work?

I am able to build the image using Docker from the command line:

docker build --force-rm -t device-guides:1.0-SNAPSHOT .

Answer 1

Packaging/publishing settings are per-project settings, rather than per-build settings.

You were using a Build.scala style build, with a format like this:

object ApplicationBuild extends Build { val main = play.Project(appName, appVersion, libraryDependencies).settings( ... ) }

The settings should be applied to this main project. This means that you call the settings() method on the project, passing in the appropriate settings to set up the packaging as you wish.

In this case:

object ApplicationBuild extends Build { val main = play.Project(appName, appVersion, libraryDependencies).settings( dockerBaseImage in Docker := "dockerfile/java:7", maintainer in Docker := "My name", dockerExposedPorts in Docker := Seq(9000, 9443), dockerExposedVolumes in Docker := Seq("/opt/docker/logs") ) }

To reuse similar settings across multiple projects, you can either create a val of type Seq[sbt.Setting], or extend sbt.Project to provide the common settings. See http://jsuereth.com/scala/2013/06/11/effective-sbt.html for some examples of how to do this (e.g. Rule #4).

This placement of settings is not necessarily clear if one is used to using build.sbt-type builds instead, because in that file, a line that evaluates to an SBT setting (or sequence of settings) is automatically appended to the root project's settings.

Answer 2

It's a wrong command you executed. I didn't saw it the first time.

run last docker:publishLocal

remove the run last

docker:publishLocal

Now you get your docker image build as expected