title: Upgrade MongoDB from 2.6 to 3.4 on Ubuntu 16.04
body: <p>I have Ubuntu 16.04 machine with MongoDB 2.6 install. </p>
  
  <p>Now I want to upgrade MongoDB to latest version, i.e., 3.4 </p>
  
  <p>What is the best way to Upgrade?</p>
  
  <p>From MongoDB website, I found that, I must have to follow step by step upgrade. e.g, 2.6 to 3.0, then 3.0 to 3.2, then 3.2 to 3.4 Is this correct? </p>
  
  <p>What is the best and safe way to upgrade MongoDB, so I can complete it with less down time?</p>