Rails how to correctly set environment variables when deploying an application?

Question

Apache HTTP Server

Hello
In the config/secret.yml configuration file, secret_key_base takes its value from an environment variable.

production:
  secret_key_base: <%= ENV["SECRET_KEY_BASE"] %>

Please tell me the correct and simple way to export the environment variable ENV["SECRET_KEY_BASE"] to the production server.
I use capistrano 3 to deploy the application. For now, I tend to choose the capistrano-secrets-yml gem , but I think there is an easier option.
UPD. Already raised Debian 7.8 , Apache + Passenger , MySQL etc. the whole environment is prepared. and the project is deploying normally. This is not the question.

Answer 1

https://www.phusionpassenger.com/documentation/Use...