CODEWITHSUNDEEP
scaladocker
FrancMo
FrancMo

Reputation: 2689

Dockerfile for sbt ( scala )

in scala app, Im using Dockerfile ( I need Dockerfile instead of native packager to automated builds in hub docker ).

FROM openjdk:8-jre-alpine

ENV SBT_VERSION 0.13.15

RUN apk add --no-cache bash curl openrc git && \
    curl -sL "http://dl.bintray.com/sbt/native-packages/sbt/$SBT_VERSION/sbt-$SBT_VERSION.tgz" | gunzip | tar -x -C /usr/local && \
    ln -s /usr/local/sbt/bin/sbt /usr/local/bin/sbt && \
    chmod 0755 /usr/local/bin/sbt && \
    apk add --no-cache --repository http://dl-cdn.alpinelinux.org/alpine/edge/main --repository  http://dl-cdn.alpinelinux.org/alpine/edge/community docker

RUN rc-update add docker

RUN sbt sbtVersion

COPY . /tmp
WORKDIR /tmp

RUN sbt stage
RUN chmod +x runAfterTime.sh
ENTRYPOINT [ "./runAfterTime.sh" ]

but it takes so much time.. downloading half of internet on each change. Can this be easily speed up ?

EDIT: Im using also "hackaround" , dockerfile:

FROM openjdk:8-jre-alpine

ENV SBT_VERSION 0.13.15

RUN apk add --no-cache bash curl openrc git && \
    apk add --no-cache --repository http://dl-cdn.alpinelinux.org/alpine/edge/main --repository  http://dl-cdn.alpinelinux.org/alpine/edge/community docker

RUN rc-update add docker

COPY target /tmp/target

COPY runAfterTime.sh /tmp

WORKDIR /tmp

RUN chmod +x runAfterTime.sh
ENTRYPOINT [ "./runAfterTime.sh" ]

So build is done from machine, using sbt cache, this way I can build image faster and push to docker hub, but would be nice to speed it up somehow, use sbt cache..

Upvotes: 3

Views: 3127

Answers (1)

FrancMo
FrancMo

Reputation: 2689

Ok I found easy solution for this. So first is to download all deps right ? To cache current stage. This we can achieve by just adding build.sbt and plugins.sbt, run sbt reload & update. And then add src files, so changes in src wont run everything from beginning. Here is done dockerfile:

FROM openjdk:8-jre-alpine

ENV SBT_VERSION 0.13.15

RUN apk add --no-cache bash curl openrc git && \
    curl -sL "http://dl.bintray.com/sbt/native-packages/sbt/$SBT_VERSION/sbt-$SBT_VERSION.tgz" | gunzip | tar -x -C /usr/local && \
    ln -s /usr/local/sbt/bin/sbt /usr/local/bin/sbt && \
    chmod 0755 /usr/local/bin/sbt && \
    apk add --no-cache --repository http://dl-cdn.alpinelinux.org/alpine/edge/main --repository  http://dl-cdn.alpinelinux.org/alpine/edge/community docker

RUN rc-update add docker
ADD build.sbt /tmp
RUN mkdir -p /tmp/project
ADD project/Commons.scala /tmp/project
ADD project/plugins.sbt /tmp/project
ADD project/build.properties /tmp/project
WORKDIR /tmp
RUN sbt reload
RUN sbt update
ADD src /tmp
ADD runAfterTime.sh /tmp
RUN sbt stage
RUN chmod +x runAfterTime.sh
ENTRYPOINT [ "./runAfterTime.sh" ]

Upvotes: 2

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