title: Is there a way to upgrade from Ruby 1.8.7 to 1.9.2 without having to reinstall gems and rails?
body: <p>In more details... I have a CentOS machine running Passenger alongside other Apache/httpd projects (PHP) and I wonder if there is some way I can upgrade my Ruby version without breaking any current running projects. I found a lot of examples on upgrading which are fine but they all include reinstalling rails and in some cases rubygems. They even require you to pass some code in your controller for encoding utf-8. There is no time doing this because it is a live server running sharp projects.</p>
  
  <p>I wonder if you can do something like this:</p>
  
  <p>E.g </p>
  
  <ol>
  <li>Installing new Ruby version
  2.Fix any symbolic links</li>
  <li>Possible bundle update</li>
  <li>Restart Apache/httpd server</li>
  </ol>
  
  <p>I don't have RVM installed because I thought it included more hassle than just installing Ruby itself.</p>
  
  <p>Everyone's talking so good about the performance in version 1.9.X I thought it might be worth the upgrade.      </p>