title: Docker container always shows ssl connection error
body: <p>I'm getting started with docker compose and have been working through the simple demo flask application. The thing is, I'm running this from inside of an organization that intercepts all communication in such a way that SSL errors are thrown right and left. They provide us with three root certificates we need to install, and I've generally got these working on my own machine, but I'm lost when it comes to getting these to work inside docker-compose deployments. </p>
  
  <p>When I run docker-compose up, I get the following:</p>
  
  <pre><code>$ sudo docker-compose up 
  Creating network "project_default" with the default driver
  Building web
  Step 1/5 : FROM python:3.4-alpine
  3.4-alpine: Pulling from library/python
  81033e7c1d6a: Pull complete
  9b61101706a6: Pull complete
  415e2a07c89b: Pull complete
  f22df7a3f000: Pull complete
  8c16bf19c1f9: Pull complete
  Digest: sha256:fe436cb066394d81cf49448a04dec7c765082445a500bc44f1ae5e8a455793bd
  Status: Downloaded newer image for python:3.4-alpine
   ---&gt; 5c72717ec319
  Step 2/5 : ADD . /code
   ---&gt; a5790c0e3e94
  Removing intermediate container 052c614e41d0
  Step 3/5 : WORKDIR /code
   ---&gt; a2ea9acb3005
  Removing intermediate container 77f2375ca0a6
  Step 4/5 : RUN pip install -r requirements.txt
   ---&gt; Running in 5f4fe856776d
  Collecting flask (from -r requirements.txt (line 1))
    Retrying (Retry(total=4, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('&lt;pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7fb0061f1d30&gt;: Failed to establish a new connection: [Errno -3] Try again',)': /simple/flask/
    Retrying (Retry(total=3, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('&lt;pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7fb0061f19b0&gt;: Failed to establish a new connection: [Errno -3] Try again',)': /simple/flask/
    Retrying (Retry(total=2, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('&lt;pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7fb0061f1828&gt;: Failed to establish a new connection: [Errno -3] Try again',)': /simple/flask/
    Retrying (Retry(total=1, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('&lt;pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7fb0061f1588&gt;: Failed to establish a new connection: [Errno -3] Try again',)': /simple/flask/
    Retrying (Retry(total=0, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('&lt;pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7fb0061f1390&gt;: Failed to establish a new connection: [Errno -3] Try again',)': /simple/flask/
    Could not find a version that satisfies the requirement flask (from -r requirements.txt (line 1)) (from versions: )
  No matching distribution found for flask (from -r requirements.txt (line 1))
  </code></pre>
  
  <p>Pip fails to install anything.  </p>
  
  <p>The docker-compose.yml file looks like this: </p>
  
  <pre><code>version: '3'
  services:
    web:
      build: .
      ports:
       - "5000:5000"
    redis:
      image: "redis:alpine"
  </code></pre>
  
  <p>And the main Dockerfile looks like this: </p>
  
  <pre><code>FROM python:3.4-alpine
  ADD . /code
  WORKDIR /code
  RUN pip install -r requirements.txt
  CMD ["python", "app.py"]
  </code></pre>
  
  <p>Is there any way to be able to make this work in this particular case? Is there a general solution to this sort of problem that would allow me to pass to any container deployed the SSL certificates and have them be used?</p>