Is Rails supported on Now?

OS: OSX 10.14.6 Node: 10.16.0 Ruby: 2.6.1 Now CLI 16.1 Rails: 6.0

Hi,

I’m having issues running Rails locally using now dev and on now.

Locally with now dev Reproduction steps:

1. rails new rails-app
2. Create a now.json with contents:

{
  "version": 2,
  "builds": [
    {
      "src": "rails-app/config.ru",
      "use": "@now/ruby"
    }
  ],
  "routes": [{ "src": "/", "dest": "rails-app/config.ru" }]
}

1. now dev yields:

> Creating initial build

> Error! Command failed with exit code 2 (ENOENT): yum install -y git gcc make tar bzip2 readline-devel openssl-devel ruby-devel zlib-devel
spawn yum ENOENT

On now

1. rails new rails-app
2. Create a now.json with contents:

{
  "version": 2,
  "builds": [
    {
      "src": "rails-app/config.ru",
      "use": "@now/ruby"
    }
  ],
  "routes": [{ "src": "/", "dest": "rails-app/config.ru" }]
}

1. Now yields:

yarn info @now/build-utils@latest...
yarn info @now/ruby...
yarn add @now/build-utils@0.10.0...
yarn add v1.17.3
info No lockfile found.
[1/4] Resolving packages...
[2/4] Fetching packages...
[3/4] Linking dependencies...
[4/4] Building fresh packages...
success Saved lockfile.
success Saved 1 new dependency.
info Direct dependencies
└─ @now/build-utils@0.10.0
info All dependencies
└─ @now/build-utils@0.10.0
Done in 0.56s.
yarn add @now/ruby@0.1.6...
yarn add v1.17.3
info No lockfile found.
[1/4] Resolving packages...
[2/4] Fetching packages...
[3/4] Linking dependencies...
[4/4] Building fresh packages...
success Saved lockfile.
success Saved 1 new dependency.
info Direct dependencies
└─ @now/ruby@0.1.6
info All dependencies
└─ @now/ruby@0.1.6
Done in 1.10s.
TypeError: util.getSystemErrorName is not a function
    at getCode (/tmp/e97d8416e11caeb8/.build-utils/.builder/node_modules/@now/ruby/dist/index.js:28461:16)
    at makeError (/tmp/e97d8416e11caeb8/.build-utils/.builder/node_modules/@now/ruby/dist/index.js:28500:35)
    at handlePromise (/tmp/e97d8416e11caeb8/.build-utils/.builder/node_modules/@now/ruby/dist/index.js:3759:26)
    at <anonymous>
    at process._tickDomainCallback (internal/process/next_tick.js:228:7)
worker exited with code 20 and signal null
done
done

Deployment URL: rails-64wuh4wd8.now.sh

Any idea what this could be?

[styfle]

Hi @antonnyman

It is possible to use Rails as you mentioned because we support Rack. The tests ensure that our Rack implementation works with known Ruby frameworks.

Rails is not recommended because, like many legacy web frameworks, it is not optimized for serverless. So you will certainly hit limitations such as 50MB max size, slow cold starts, maybe even slower builds.

Maybe the docs could in the future specify which parts of Rails you can use, like the API parts?

We recommend creating an api directory containing your functions. The platform will handle routing for you so you don’t need an additional framework. Then add a index.html file in the root for your home page.

See the intro documentation here: https://zeit.co/docs/v2/serverless-functions/introduction

[antonnyman]

Thanks for the explanation @styfle.