title: Docker build argument
body: <p>How does one pass arguments into a dockerfile?</p>
  
  <p>Lets say I have the dockerfile:</p>
  
  <pre><code>FROM    ubuntu:14.04
  
  MAINTAINER Karl Morrison
  
  sudo do-something-here myVarHere
  </code></pre>
  
  <p>I would want to build the file as so for example:</p>
  
  <pre><code>docker build basickarl/my-image-example /directory/of/my/dockerfile "my string to be passed to myVarHere here!"
  </code></pre>