title: Installing mongo client in a Docker container
body: <p>I am using <code>fig</code> to build and run my app within various <code>Docker</code> containers and so-far, so good.</p>
  
  <p>I have a container for my app and a <code>db</code> container with <code>mongo</code> in it.</p>
  
  <p>But now I am trying to connect to the <code>mongo</code> server to seed it with a user and database and I can't find how to install the <code>mongo</code> client.</p>
  
  <p>My app's image is derived from the standard <code>dockerfile/nodejs</code> image and that does not include a <code>mongo</code> client.</p>
  
  <p>Trying <code>RUN mongo</code> just gives an error <code>mongo not found</code>.</p>
  
  <p>All the documentation I've turned up so far relates to how to install the <code>mongo server</code> within a <code>Docker</code> container, and nothing I;ve found so far tells me how to install the <code>mongo</code> client.  How do I do this?</p>