> [...] the actual change can happen on the "client servers" at any point within next 20 minutes. [...] What if you want to switch over your web servers at a sp

> [...] the actual change can happen on the "client servers" at any point within next 20 minutes. [...] What if you want to switch over your web servers at a specific moment? You don't. Configuration management is a wrong operation mode for a synchronous change. Still, you could order all your Puppet agents to run their scheduled operation now instead of leaving it waiting for its time.