These days a lot of companies will have production systems launch from a configuration that is known to work as expected already, via QA processes. It'll be lau

These days a lot of companies will have production systems launch from a configuration that is known to work as expected already, via QA processes. It'll be launched and configured with tools like chef, puppet, docker, and other buzzwordy technologies. When something needs to be changed, you edit the static configs, stored in a source control system, and let chef and company do the heavy lifting.