title: Docker hangs on the RUN command OSX
body: <p>I have been learning docker using the docker docs, and first encountered a problem in the quick start guide to Django. The program would build normally up until the the second to last command. Here is my dockerfile and the output:</p>
  
  <pre><code>FROM python:3.5.2
  ENV PYTHONUNBUFFERED 1
  WORKDIR /code
  ADD requirements.txt /code
  RUN pip3 install -r requirements.txt
  ADD . /code
  </code></pre>
  
  <p>Then when I run:</p>
  
  <pre><code>docker-compose run web django-admin startproject src .
  </code></pre>
  
  <p>I get the whole thing built and then it hangs:</p>
  
  <pre><code>Installing collected packages: Django, psycopg2
  Running setup.py install for psycopg2: started
  Running setup.py install for psycopg2: finished with status 'done'
  Successfully installed Django-1.10.5 psycopg2-2.6.2
  </code></pre>
  
  <p>So since I don't have experience with compose I tried the most basic docker build that included a dockerfile. This one also got hung up.</p>
  
  <pre><code>FROM docker/whalesay:latest
  RUN apt-get -y update &amp;&amp; apt-get install -y fortunes
  CMD /usr/games/fortune -a | cowsay
  </code></pre>
  
  <p>And this is the last terminal line before the hang.</p>
  
  <pre><code>Processing triggers for libc-bin (2.19-0ubuntu6.6) ...
  </code></pre>
  
  <p>According to the tutorial this occurs in the same spot. The second to last command, which happens to also be RUN.</p>
  
  <pre><code>Processing triggers for libc-bin (2.19-0ubuntu6.6) ...
  ---&gt; dfaf993d4a2e
  Removing intermediate container 05d4eda04526
  [END RUN COMMAND]
  </code></pre>
  
  <p>So thats why I think its in the RUN command, but I'm not sure why or how to fix it. Does anyone know why this might be occurring? I am using a Macbook Pro 8.1 running OSX EL CAPITIAN version 10.11.6 and Docker version 1.13.1, build 092cba3</p>