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Ruby on Rails CDN Integration

Updated on October 4, 2018

This guide shows how to complete a Ruby on Rails (RoR) CDN integration.

  1. Create a Pull Zone or a Push Zone before you start with the RoR CDN integration.

  2. To set your asset host in Rails, you need to change config.action_controller.asset_host in config/production.rb:

    config.action_controller.asset_host = ''

    there is no need to specify the scheme (http:// or https://) in the config file. It's also possible to work with CNAMEs (e.g. In that case a Zone Alias needs to be created as well.

  3. You can also set this value through an environment variable in order to make running a staging copy of your site easier.

    config.action_controller.asset_host = ENV['CDN_HOST']

    For this to work, CDN_HOST needs to be set on your server (pointing to your Zone e.g.

  4. Once you have configured your server. Content can be delivered from KeyCDN like this:

    <%= asset_path('file.png') %>

    Instead of returning a path such as /assets/file.png. The URL generated will have the full path to your KeyCDN Zone such as

That's it! Your Ruby on Rails CDN integration is completed. Let us know if you have questions or issues.

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