title: AWS EMR perform "bootstrap" script on all the already running machines in cluster
body: <p>I have one EMR cluster which is running 24/7. I can't turn it off and launch the new one. </p>
  
  <p>What I would like to do is to perform something like bootstrap action on the already running cluster, preferably using Python and boto or AWS CLI. </p>
  
  <p>I can imagine doing this in 2 steps:</p>
  
  <p>1) run the script on all the running instances (It would be nice if that would be somehow possible for example from boto)</p>
  
  <p>2) adding the script to bootstrap actions for case that I'd like to resize the cluster.</p>
  
  <p>So my question is: Is something like this possible using boto or at least AWS CLI? I am going through the documentation and source code on github, but I am not able to figure out how to add new "bootstrap" actions when the cluster is already running.</p>