> Having worked for some time with configuration management and backend development and seeing the growing pains that happen after any "non-trivial" use case of

> Having worked for some time with configuration management and backend development and seeing the growing pains that happen after any "non-trivial" use case of it like: obscure declarative languages/DSLs, tangled messes of declarative vs scripted configurations, inter-dependencies that are not so obvious until you hit a corner case, etc., I can say that Docker has been a breeze, even when I encounter a breaking bug in a new release that breaks it somehow. I don't really see how the Docker model is better. I wouldn't trust a person who wrote a terrible Puppet file to work on a Docker container. I can understand that from a Devops point a view, it's more convenient, however you can easily just build a VM image with Puppet and deploy that to your billions of servers.