Ruby agent installation

Installing the New Relic Ruby agent will enable you to monitor the performance of your application and obtain deep visibility into your Ruby app.

New Relic Ruby agent installation video

This tutorial covers how to install the Ruby agent in your project, configure your Ruby application to use New Relic, confirm that your agent is reporting, and do some basic troubleshooting.


[video link] For tips to install your New Ruby agent, watch this video (approximately 6 minutes). View more videos and tutorials at

Install the gem

The New Relic Ruby agent's gem is available from as newrelic_rpm. For applications using Bundler, add this gem to the Gemfile:

gem 'newrelic_rpm'

If you're using Rails 3 or higher, or Rails 2.3 in the recommended configuration, Rails will automatically call Bundler.require and cause newrelic_rpm to be required during startup of your application. If you're using Sinatra or another framework, you'll need to either manually call require 'newrelic_rpm', or call Bundler.require.

In order to use automatic Browser application monitoring and Cross application tracing in a Rack application that does not use Sinatra or Rails, manually include additional Rack middlewares provided by the agent. Place the New Relic gem as low in the list as possible, allowing the frameworks above it to be instrumented when the gem initializes.

Install the configuration file

After installing the agent, you will need to install the newrelic.yml file, also known as the configuration file. To get a new newrelic.yml file, download it from the Account settings page when logged in to

To install the configuration file and name your app:

  1. Copy the newrelic.yml file into the config sub-directory of your application.
  2. Change the default application name to a meaningful name.

Update the agent

If you're using Bundler, run bundle update newrelic_rpm. Otherwise, run gem update newrelic_rpm.

Install agent outside production environments

Typically you will install the New Relic Ruby agent in your production environment. If you want to try out the Ruby agent in a development or localhost environment, verify in the relevant environment: block of the newrelic.yml file that the monitor_mode config value has been set to true.

For example, to deploy New Relic in your development environment and still be able to view your app's performance metrics, in the development: block, set the monitor_mode config value to true. For more information about using New Relic's Ruby agent outside production environments, see Developer mode.

Uninstall the Ruby agent gem

To uninstall the Ruby agent using Bundler, remove gem 'newrelic_rpm' from your Gemfile. If you are not using Bundler, remove all references to newrelic_rpm from your environment.rb file.

Install on older versions of Rails

If you're installing the Ruby agent on Rails 2.x, and aren't using Bundler, use the instructions below.

Rails 2.1 - 2.3 without Bundler

  1. Install the gem using gem install newrelic_rpm.
  2. Edit environment.rb, and add to the initializer block: config.gem "newrelic_rpm".

Rails pre-2.1

New Relic does not officially support Rails versions prior to 2.1. However, if you want to use New Relic for Rails versions 2.0.*, edit environment.rb and add this statement after the initializer: block:

require "newrelic_rpm"

For more help

Additional documentation resources include:

  • Ruby agent configuration (general configuration settings, proxy, transaction tracer, error collection, and updates)
  • New Relic for Ruby (overview of compatibility and requirements, installation, configuration, troubleshooting, known issues, advanced features, and beta releases)
  • Updating deprecated Ruby agents (Ruby agent versions that New Relic no longer supports, how to verify the version your app uses, and how to ensure you have the most up-to-date version)

Join the discussion about Ruby in the New Relic Online Technical Community! The Technical Community is a public platform to discuss and troubleshoot your New Relic toolset.

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