I don't see what the issue is with space/size having the JDK in a docker issue layer vs installing through ansible/chef later (or whenever it is you're doing).

I don't see what the issue is with space/size having the JDK in a docker issue layer vs installing through ansible/chef later (or whenever it is you're doing). Docker images are layered, and by including a pinned version of the JVM that's baked into a core Docker stack for your org that's been security hardened, tested, etc, seems like it's better than taking the time to install a JVM every time during deployment of the worker node. EDIT: checking out Nomad now, since we have used other Hashicorp prods in the past...