title: Docker swarm - flow of request in case of many managers
body: <p>As we know in docker swarm we can have more than one manger. Let's suppose that we have 2 nodes and 2 managers (so each node is both manager and worker). </p>
  
  <p>Now, let client (using CLI tool) execute following two seperated scenarios:<br>
  1. <code>docker create service some_service</code><br>
  2. <code>docker update --force some_service</code><br>
  where client is launched on one of swarm nodes.<br>
  Where will above requests  be sent? Only to leader or to each worker node? How docker deal with simultaneous requests?</p>