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I'm still failing to understand what solution is there out there that handles web application deployments (especially JVM ones) in an idempotent way. Including

I'm still failing to understand what solution is there out there that handles web application deployments (especially JVM ones) in an idempotent way. Including pushing the WAR file, upgrading the database across multiple nodes etc. Perhaps there are built-in solutions for Rails / Django / Node.js applications, but I couldn't find a best practice way to do this for JVM deployments. E.g. there is no "package" resource for Puppet that is a "Java Web Application" that you could just ask to be in a certain versions. How do you guys do this for Rails apps? Django apps? is this only an issue with Java web apps?

druiid 13y ago
Well, simply enough, it's kind of a difficult problem to solve. The way most rails apps do it, is deployment with Capistrano or similar. There's also Fabric which can interface pretty well with rails deployment as well. Honestly the methodology I've seen under most deployment situations is far, far from idempotent and is a bit terrible in this respect. There are lots of tools within Rails and Capistrano that hopefully get you to a state approaching 'idempotent' deployments, but they fairly often aren't.