And what do you do when the machine goes down? How do you test that all services come back up again? Your infrastructure should be resilient against servers and

And what do you do when the machine goes down? How do you test that all services come back up again? Your infrastructure should be resilient against servers and services going down. But you can't test that if they never go down. See Netflix chaos monkey, or CoreOS automatically restarting after updates (which are rather frequent, every couple weeks).