Thanks  David Kimura  for your quick responses. I don't need any identifiable information of the users . How can I set docker to not keep any of these info or set a time to remove logs? I am trying to crate a cookies policy for my app and I want to comply the gdpr which tells that you can have logs for troubleshooting issues but set a time limit for you logs. 

Currently I have this:   

  # production.rb file

  config.logger = ActiveSupport::Logger.new("log/production.log", 5, 50.megabytes)

  # application.rb file

    config.lograge.formatter = Lograge::Formatters::Json.new

    config.lograge.custom_options = lambda do |event|

      {

        controller: event.payload[:controller],

        action: event.payload[:action],

        params: event.payload[:params].except("controller", "action"),

        method: event.payload[:method],

        status: event.payload[:status],

        format: event.payload[:format],

        path: event.payload[:path],

      }

    end