title: How to upload custom boot image to MAAS
body: <p>I successfully installed latest MAAS in ubuntu and i like to upload centos7 to MAAS boot images
  I have CentOS-7-x86_64-Everything-1511.iso how can i upload into MAAS.
  I searched for uploading custom image to MAAS but i could not find any good way to upload it and some methods are lot of confusion for me.</p>
  
  <p>Please provide a set by step guide to do this</p>
  
  <p>Thank you</p>