title: How to update the client.pem in nodes while chef server migration from old to new?
body: <p>I successfully migrated open source chef-11 to open source chef-12 server using knife-backup. However, knife-backup does not seem to update the nodes, and all my nodes are still pointing to the old server in their respective client.rb files, and their validation.pem and client.pem are still paired with the old server.</p>
  
  <p>Obviously, one way to do so would be to bootstrap the node again to the new server, however I do not want to do that because I do not want to deploy to these nodes because that could cause a loss of data.</p>
  
  <p>Is there any way to update client.pem in the nodes without having to bootstrap the client node.</p>
  
  <p>I have followed this link to migrate:</p>
  
  <p><a href="https://docs.chef.io/release/osc_11-1/upgrade_server_open_source.html" rel="nofollow">https://docs.chef.io/release/osc_11-1/upgrade_server_open_source.html</a></p>