Play on Docker

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The document provides instructions on building and running a Play application using Docker with an Alpine Java base image. It includes details on setting up a Dockerfile, creating a start script, and useful Docker commands for running and managing the container. Additionally, it highlights memory management considerations and provides links to relevant resources.

Software

PLAY?ON?DOCKER
Daniel Pfei?er - @pfei?er_d_

CLASSIC?DOCKERFILE
BUILD?THE?IMAGE
FROM anapsix/alpine-java:8u141b15_jdk
COPY ./target/scala-2.12/assembly.jar /app/assembly.jar
EXPOSE 9000
ENTRYPOINT ["java", "-jar", "/app/assembly.jar"]
docker build -t com.github.dpfeiffer/play-docker-showcase .

$DOCKERFILE?WITH?SBT BUILD?THE?IMAGE addSbtPlugin("se.marcuslonnberg" % "sbt-docker" % "1.4.1") dockerfile in docker := { new Dockerfile { from("anapsix/alpine-java:8u141b15_jdk") copy(assembly.value, "/app/assembly.jar") expose(9000) entryPoint("java", "-jar", "/app/assembly.jar") } } sbt docker$

$I?PREFER?A?START?SCRIPT #!/usr/bin/env bash exec java -jar /app/assembly.jar dockerfile in docker := { new Dockerfile { from("anapsix/alpine-java:8u141b15_jdk") copy(assembly.value, "/app/assembly.jar") copy(file("./start.sh"), "/app/start.sh") run("chmod", "+x", "/app/start.sh") expose(9000) cmd("/app/start.sh") } }$

RUNNING?THE?APPLICATION
Build the Docker image with
Run the Docker image with
sbt docker
docker run -m 128M -it --rm -p 9000:9000 -name showcase
-e PLAY_HTTP_SECRET_KEY=changed
com.github.dpfeiffer/play-docker-showcase

USEFUL?COMMANDS
View the Docker container stats
Enter the container bash
Get a memory overview of the JVM inside the
container
docker stats showcase
docker exec -it showcase /bin/bash
jcmd 1 VM.native_memory summary

$WITH?�\XMX?YOU?SET?THE?MAX MEMORY...$

FINAL?THOUGHTS
existing VM ?ags are not enough
non-heap at least is "predictable"
"micro" services on the JVM are not that micro
use small base images to save tra?c
non heap grows over time, keep some space

LINKS
https://github.com/marcuslonnberg/sbt-docker
https://github.com/sbt/sbt-native-packager
http://trustmeiamadeveloper.com/2016/03/18/where-
is-my-memory-java/
https://www.playframework.com/documentation/2.6.x/
the-sbt-assembly-plugin
http://www.pointsoftware.ch/wp-
content/uploads/2012/10/JUtH_20121024_RuntimeData

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