title: Google Cloud Platform Add Instance To Managed Instance Group
body: <p>It seems like the managed instance groups in the Google Cloud console should be a nice thing to use as an easy way to scale or add / remove instances.  What I don't get is how to create a new instance and add it to that group?  I can modify the number of instances in the Edit Group Settings page and it will create a new instance and add it to the group but I don't want a new instance automatically up and going in the group.  I need to create an instance, bootstrap it, run chef-client, etc and validate that all is fine before I want the instance available in the group.</p>
  
  <p>The only way I can seem to do this is to use unmanaged instance groups.  This allows me to create an instance and then add it to a group.</p>
  
  <p>Is there a way to do what I need using managed instance groups, since that's what Google recommends to use?</p>