Dockerfile

FROM ubuntu:14.04

ENV DEBIAN_FRONTEND noninteractive

# Elixir requires UTF-8
RUN locale-gen en_US.UTF-8
ENV LANG en_US.UTF-8
ENV LANGUAGE en_US:en
ENV LC_ALL en_US.UTF-8

RUN apt-get update && apt-get upgrade -y && \
    apt-get install -y wget curl inotify-tools

# install Node.js (>= 5.0.0) and NPM in order to satisfy brunch.io dependencies
# See http://www.phoenixframework.org/docs/installation#section-node-js-5-0-0-
RUN curl -sL https://deb.nodesource.com/setup_5.x | sudo -E bash - && apt-get install -y nodejs

# download and install Erlang package
RUN wget http://packages.erlang-solutions.com/erlang-solutions_1.0_all.deb \
 && dpkg -i erlang-solutions_1.0_all.deb \
 && apt-get update

# install latest elixir package
RUN apt-get install -y elixir erlang-dev erlang-parsetools erlang-eunit

ENV PHOENIX_VERSION 1.2.0

# install the Phoenix Mix archive
RUN mix archive.install --force https://github.com/phoenixframework/archives/raw/master/phoenix_new-$PHOENIX_VERSION.ez

# Install hex & rebar
RUN mix local.hex --force && \
  mix local.rebar --force && \
  mix hex.info

WORKDIR /cwd