akka-http application running inside docker - docker

Question

I've got an akka-http application that works fine locally, I'm having some problems "dockerizing" the application. I build the docker image through the Dockerfile and using a docker-entrypoint to execute the java -jar command. When I firstly access the running docker container the app is not running although If I access the container and manually execute the java -jar command the app starts fine. If I execute the following command (inside the container) the application starts fine as well:
bash -xe docker-entrypoint.sh
See below my Dockerfile
FROM qa.stratio.com/stratio/ubuntu-base:16.04
MAINTAINER stratio
ARG VERSION
RUN apt-get update && apt-get install -y screen
COPY target/khermes-${VERSION}-allinone.jar /khermes.jar
COPY docker/docker-entrypoint.sh /
COPY src/main/resources/application.conf /
EXPOSE 8080
ENTRYPOINT ["/docker-entrypoint.sh"]
And see also below my docker-entrypoint.sh:
#!/bin/bash -xe
java -jar -Dkhermes.client=false -Dakka.remote.hostname=localhost -
Dakka.remote.netty.tcp.port=2553 -Dakka.cluster.seed-
nodes.0=akka.tcp://khermes#localhost:2552 /khermes.jar
tail -f /dev/null
Does anyone have an idea on why my application is getting killed when I run the container?

Answer 1

I recommend using SBT Native Packager instead. My build.scala looks like this
import com.typesafe.sbt.packager.archetypes.JavaAppPackaging
import com.typesafe.sbt.packager.docker.{Cmd, DockerPlugin}
import com.typesafe.sbt.packager.docker.DockerPlugin.autoImport._
import sbt._
import Keys._
object build extends Build {
lazy val root: Project = Project(
id = "my-awesome-server",
base = file("."),
settings = Defaults.coreDefaultSettings ++ Seq(
resolvers ++= {
Seq(
"sonatype snapshots" at "https://oss.sonatype.org/content/repositories/snapshots"
},
organization := "co.awesome-startup",
version := "2.69",
scalaVersion := "2.11.8",
libraryDependencies ++= {
Seq(
"org.tpolecat" %% "atto-core" % "0.4.2" withSources()
)
},
dockerBaseImage := "expert/docker-java-minimal:server-jre",
dockerCommands := dockerCommands.value.flatMap {
case cmd#Cmd("FROM", _) => List(cmd, Cmd("RUN", "apk update && apk add bash"))
case other => List(other)
},
dockerRepository := Some("awesome-startup"),
version in Docker := version.value,
scalacOptions := Seq("-unchecked", "-deprecation", "-encoding", "utf8", "-language:implicitConversions", "-language:postfixOps", "-language:higherKinds", "-Xcheckinit"), //, "-Xlog-implicits"),
javaOptions in compile += "-g:source,lines,vars",
crossPaths := false,
mainClass in Compile := Some("co.awesome-startup.server.EntryPoint")
)
).enablePlugins(JavaAppPackaging).
enablePlugins(DockerPlugin)
}
You'll need to change name of project and dockerRepository to match your repo in Docker Hub and then you can build and deploy it by calling sbt docker:publish. If you want to publish Docker image locally call sbt docker:publishLocal