[Nix-dev] Tips on deploying a Scala Play application

[4levels]

Hi Teo,

Thank you for your explanation and quick qualitative response!

I'll be looking at your code asap and report back with my experiences ;-)

Kind regards,

Erik

On Tue, Jul 5, 2016, 22:08 Teo Klestrup Röijezon <teo at nullable.se> wrote:

> Hi,
>
> A JRE should be enough for running it, but you need sbt and a JDK for
> building. I've got a derivation for a Play website at
> https://github.com/BlocklandGlass/ParseTS-Playground/blob/master/parsets-playground.nix,
> with the NixOS/NixOps setup at
> https://github.com/BlocklandGlass/ParseTS-Playground/tree/master/deployment
> .
>
> The gist of it is to run "sbt stage" in the build phase, and to then take
> "target/universal/stage" as your build output. However, you'll also need to
> wrap the launcher script to add your JRE and to add gawk (which the
> launcher script requires). Finally, on any modern system (such as NixOS)
> you'll also want to disable Play's PID file management, since systemd takes
> care of that anyway. I didn't in that script, but you'll probably also want
> to add a testing phase as part of the build.
>
> The big drawback with this approach is that SBT downloads all dependencies
> from the internet on demand, which won't work on a Nix setup with proper
> isolation (ideally, builds should only have network access if they
> deterministically produce a given hash).
>
> I've been toying with the idea of writing a sbt2nix SBT plugin that
> generates Nix definitions to build a local maven mirror for the
> dependencies, but I haven't got around to that (yet).
>
> // Teo
>
> On 5 July 2016 at 21:52, 4levels <4levels at gmail.com> wrote:
>
>> Hi Nix-devs,
>>
>> This is a plain request for assistance / best practices for using Nixos
>> with Java / Scala / Play.  Akka with EventSourcing are also a topic of
>> interest.
>>
>> I'm currently trying to get a Scala Play app up and running on my nixOps
>> deployed machines.  As I'm very unfamiliar with running Java based apps,
>> I'd like to know if someone has experience on the common pitfalls and tips
>> on keeping the servers healthy (I just caused my laptop's 8 cores to go
>> 100% without being able to stop the server started by the activator call).
>>
>> I've seen some related packages in nixpkgs and have many questions like
>> eg. do I need sbt (which seems to provide typesafe - activator) and a jdk
>> on the production servers or are is a jre sufficient? How do I deploy and
>> run a Java app developed locally?
>> And how do I set-up a local nixos vm for Java development?
>>
>> I'm still investigating and learning a lot myself, so nix-related
>> knowledge is my main concern here (as I need to figure out the rest myself
>> anyway ;-)
>>
>> I'll be happy to share my findings and configuration / setup..
>>
>>
>> Kind regards,
>>
>> Erik
>>
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>> nix-dev at lists.science.uu.nl
>> http://lists.science.uu.nl/mailman/listinfo/nix-dev
>>
>>
>
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