Generic Ubuntu dev environment Dockerfile

Dockerfile

# Use Xenial as a base image

FROM ubuntu:16.04

# Fix ReadLine warnings
ENV TERM linux

# Install apt based dependencies required to run Rails as
# well as RubyGems. As the Ruby image itself is based on a
# Debian image, we use apt-get to install those.
RUN apt-get update && apt-get install -y \
  apt-utils \
  sudo \
  build-essential \
  nodejs \
  bundler \
  vim \
  dialog

# Configure the main working directory. This is the base
# directory used in any further RUN, COPY, and ENTRYPOINT
# commands.
RUN useradd -ms /bin/bash ubuntu
RUN usermod -a -G sudo ubuntu
USER ubuntu
WORKDIR /home/ubuntu

# Configure sudoers file

USER root
RUN echo '%sudo ALL=(ALL) NOPASSWD:ALL' > /etc/sudoers

# Copy the main application.
COPY . ./

# Expose specified port to the Docker host, so we can access it
# from the outside.
EXPOSE 4567

# Install sinatra

USER ubuntu
RUN sudo gem install sinatra

# The main command to run when the container starts. Also
# tell the Rails dev server to bind to all interfaces by
# default.
# CMD ["bundle", "exec", "rails", "server", "-b", "0.0.0.0"]