title: Dockerinzing Play framework
body: <p>I am developing a web app using play fraework2.6. I am trying to have java8, postgres and nginx in my dockerfile. Here's the docker file:</p>
  
  <pre><code>    FROM ubuntu:14.04
  
  #INSTALL
  RUN \
      echo "deb http://dl.bintray.com/sbt/debian /" | tee -a /etc/apt/sources.list.d/sbt.list \
      &amp;&amp; sudo apt-get update -y --force-yes  \
      &amp;&amp; sudo apt-get install -y --force-yes sbt
  
  RUN apt-get update &amp;&amp; apt-get -y  upgrade &amp;&amp; apt-get -y  install software-properties-common &amp;&amp; add-apt-repository ppa:webupd8team/java -y  &amp;&amp; apt-get update
  
  RUN (echo oracle-java8-installer shared/accepted-oracle-license-v1-1 select true | /usr/bin/debconf-set-selections) &amp;&amp; apt-get install -y  oracle-java8-installer oracle-java8-set-default
  
  ENV JAVA_HOME /usr/lib/jvm/java-8-oracle
  ENV PATH $JAVA_HOME/bin:$PATH
  ENV SBT_OPTS="-Xmx2048M"
  ENV SBT_OPTS="-XX:MaxPermSize=2048m"
  
  # Add the PostgreSQL PGP key to verify their Debian packages.
  # It should be the same key as https://www.postgresql.org/media/keys/ACCC4CF8.asc
  RUN apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys B97B0AFCAA1A47F044F244A07FCC7D46ACCC4CF8
  
  # Add PostgreSQL's repository. It contains the most recent stable release
  #     of PostgreSQL, ``9.3``.
  RUN echo "deb http://apt.postgresql.org/pub/repos/apt/ precise-pgdg main" &gt; /etc/apt/sources.list.d/pgdg.list
  
  # Install ``python-software-properties``, ``software-properties-common`` and PostgreSQL 9.3
  #  There are some warnings (in red) that show up during the build. You can hide
  #  them by prefixing each apt-get statement with DEBIAN_FRONTEND=noninteractive
  RUN apt-get update &amp;&amp; apt-get install -y python-software-properties postgresql-9.3 postgresql-client-9.3 postgresql-contrib-9.3
  
  # Install Nginx
  RUN sudo apt-get install -y nginx
  
  # RUN echo "\ndaemon off;" &gt;&gt; /etc/nginx/nginx.conf
  # Note: The official Debian and Ubuntu images automatically ``apt-get clean``
  # after each ``apt-get``
  
  # Run the rest of the commands as the ``postgres`` user created by the ``postgres-9.3`` package when it was ``apt-get installed``
  USER postgres
  
  # Create a PostgreSQL role named ``docker`` with ``docker`` as the password and
  # then create a database `docker` owned by the ``docker`` role.
  # Note: here we use ``&amp;&amp;\`` to run commands one after the other - the ``\``
  #       allows the RUN command to span multiple lines.
  RUN    /etc/init.d/postgresql start &amp;&amp;\
      psql --command "CREATE USER crm_play WITH SUPERUSER PASSWORD 'prod#123';" &amp;&amp;\
      createdb -O crm_play crm_play
  
  # Adjust PostgreSQL configuration so that remote connections to the
  # database are possible.
  RUN echo "host all  all    0.0.0.0/0  md5" &gt;&gt; /etc/postgresql/9.3/main/pg_hba.conf
  
  # And add ``listen_addresses`` to ``/etc/postgresql/9.3/main/postgresql.conf``
  RUN echo "listen_addresses='*'" &gt;&gt; /etc/postgresql/9.3/main/postgresql.conf
  
  # Expose the PostgreSQL port
  EXPOSE 5432
  
  # Add VOLUMEs to allow backup of config, logs and databases
  VOLUME  ["/etc/postgresql", "/var/log/postgresql", "/var/lib/postgresql"]
  
  # Set the default command to run when starting the container
  # CMD ["/usr/lib/postgresql/9.3/bin/postgres", "-D", "/var/lib/postgresql/9.3/main", "-c", "config_file=/etc/postgresql/9.3/main/postgresql.conf"]
  
  WORKDIR /java/src/project
  
  RUN sbt update
  
  EXPOSE 9000
  ENTRYPOINT ["sbt", "run"]
  COPY . /java/src/project
  </code></pre>
  
  <p>First of all is this the correct way to do this. Also build takes too much of time to build. I am building like this: </p>
  
  <pre><code>docker build -t image:tag .
  </code></pre>
  
  <p>build downloads all dependencies in sbt and other dependencies mentioned in docker file. After that I run </p>
  
  <pre><code>docker run -it -p 9000:9000 image:tag
  </code></pre>
  
  <p>It again starts downloading all the dependencies. What I am doing wrong here?</p>