Currently, it’s possible to run a Puppet master server under Puppet Server, Rack, and WEBrick. Over the next year, we want to provide a smaller number of better-supported options and unify the runtime environment onto the much more performant JVM/Clojure/JRuby combination. So, in Puppet 5.0, we’re consolidating the network stack onto Puppet Server and will be removing support for Rack and WEBrick masters. This will also enable the Clojure Certificate Authority (which was first delivered as a compatible drop-in replacement for the Ruby CA with Puppet Server 1.0) to become the single CA codebase and enable fixes for long-standing issues with both the user interaction and the underlying implementation.
This means that users running the standalone
puppet master application or Passenger-based puppetmasters should start evaluating Puppet Server during the 4.x series so you’re ready for Puppet 5. Most sites which have migrated so far work fine under Puppet Server, but if you are doing custom work at the Apache/Nginx or Rack layers at your site, which aren’t covered by the existing documentation, please file a bug in the SERVER project in Puppet Labs’ JIRA describing your setup. Under the hood, Puppet Server uses the Jetty web server which is highly configurable and can probably do what you need with a little coaxing.