title: Choose available memory for containers in Rancher
body: <p>In rancher, how do I choose the available memory for a docker container?
  On OSX, I can do like so:</p>
  
  <pre><code>VBoxManage modifyvm default --memory 5000
  </code></pre>
  
  <p>To define the memory available to my docker-machine. How would I achieve this using rancher to set up a host?</p>