TripleO Deploy Artifacts (and puppet development workflow)

For a while now, TripleO has supported a "DeployArtifacts" interface, aimed at making it easier to deploy modified/additional files on your overcloud, without the overhead of frequently rebuilding images.

This started out as a way to enable faster iteration on puppet module development (the puppet modules are by default stored inside the images deployed by TripleO, and generally you'll want to do development in a git checkout on the undercloud node), but it is actually a generic interface that can be used for a variety of deployment time customizations.

TripleO Composable Services 101

Over the newton cycle, we've been working very hard on a major refactor of our heat templates and puppet manifiests, such that a much more granular and flexible "Composable Services" pattern is followed throughout our implementation.

It's been a lot of work, but it's been a frequently requested feature for some time, so I'm excited to be in a position to say it's complete for Newton (kudos to everyone involved in making that happen!) :)

This post aims to provide an introduction to this work, an overview of how it works under the hood, some simple usage examples and a roadmap for some related follow-on work.