Setting up Cloud Debugger for Ruby

Overview

This page describes how to configure your environment and your Ruby application to use Cloud Debugger. For some environments, you must explicitly specify the access scope to let the Cloud Debugger agent send data. We recommend setting the broadest possible access scope and then using Identity and Access Management to restrict access. In keeping with this best practice, set the access scope to be all Cloud APIs with the option cloud-platform.

Language versions and compute environment

Cloud Debugger is available for Ruby versions 2.2 and higher.

App Engine Standard environment	App Engine Flexible environment	Compute Engine	Google Kubernetes Engine	Cloud Run	Cloud Run for Anthos on Google Cloud	VMs and Containers running elsewhere	Cloud Functions

This product or feature is covered by the Pre-GA Offerings Terms of the Google Cloud Platform Terms of Service. Pre-GA products and features may have limited support, and changes to pre-GA products and features may not be compatible with other pre-GA versions. For more information, see the launch stage descriptions.

Setting up Cloud Debugger

To set up Cloud Debugger, complete the following tasks:

1. Verify the Cloud Debugger API is enabled for your project.

2. Install and configure the Debugger on the compute environment you're using.

3. Select your source code.

Verifying the Cloud Debugger API is enabled

To begin using Cloud Debugger, ensure that the Cloud Debugger API is enabled. Cloud Debugger is enabled by default for most projects.
Enable Cloud Debugger API

Note: Cloud Debugger is free to use. However, you need a Google Cloud project with billing enabled before you can use Cloud Debugger.

App Engine flexible environment

1. Add the stackdriver gem to your Gemfile:

   gem "stackdriver"
   

2. Enable the agent.

Rails

Bundler automatically loads the library into your app when it starts. No configuration is required.

Rack

Use the Rack Middleware provided by the library:

require "google/cloud/debugger"

use Google::Cloud::Debugger::Middleware

Other

For pure Ruby apps, start the agent explicitly at the entry point:

require "google/cloud/debugger"

Google::Cloud::Debugger.new.start

The debugger is now ready for use with your app.

Google Kubernetes Engine

GCLOUD

To enable Debugger using gcloud, complete the following steps:

1. Create your cluster with one of the following access scopes:

   • https://www.googleapis.com/auth/cloud-platform grants your cluster access to all Google Cloud APIs.

   • https://www.googleapis.com/auth/cloud_debugger grants your cluster access to only the Debugger API. Use this access scope to harden your cluster's security.

   gcloud container clusters create example-cluster-name \
          --scopes=https://www.googleapis.com/auth/cloud_debugger
   

   Note: You cannot change the access scopes of a cluster after creation.

2. Add the stackdriver gem to your Gemfile:

   gem "stackdriver"
   

3. Add the following line to your Dockerfile to add the Debugger agent:

   Run bundle install
   

4. Enable the Debugger agent:

   Rails

   Bundler automatically loads the library into your app when it starts.

   You can optionally provide a service and version through the Ruby on Rails configuration interface:

   # Add this to config/environments/*.rb
   Rails.application.configure do |config|
     config.google_cloud.debugger.service_name = "SERVICE-NAME"
     config.google_cloud.debugger.service_version = "SERVICE-VERSION"
   end
   

   Where:

   • SERVICE-NAME is a name for your app, such as MyApp, Backend, or Frontend.
   • SERVICE-VERSION is a version, such as v1.0, build_147, or v20170714.

   We recommend setting these from environment variables so you do not need to change the source code with each deployment.

   Debugger is enabled by default when Rails is running in production mode. To enable Debugger in development mode, add the following:

   # Add this to config/environments/development.rb
   Rails.application.configure do |config|
     config.google_cloud.use_debugger = true
   end

   Rack

   Use the Rack Middleware provided by the library:

    require "google/cloud/debugger"
   
    Google::Cloud::Debugger.configure do |config|
      config.service_name = "SERVICE-NAME"
      config.service_version = "SERVICE-VERSION"
     end
   
    use Google::Cloud::Debugger::Middleware
   

   Where:

   • SERVICE-NAME is a name for your app, such as MyApp, Backend, or Frontend.
   • SERVICE-VERSION is a version, such as v1.0, build_147, or v20170714.

   We recommend setting these from environment variables so you do not need to change the source code with each deployment.

   Other

   For pure Ruby apps, start the agent explicitly at the entry point:

   require "google/cloud/debugger"
   
   Google::Cloud::Debugger.new(service_name: "SERVICE-NAME",
                       service_version: "SERVICE-VERSION").start
   

   Where:

   • SERVICE-NAME is a name for your app, such as MyApp, Backend, or Frontend.
   • SERVICE-VERSION is a version, such as v1.0, build_147, or v20170714.

   We recommend setting these from environment variables so you do not need to change the source code with each deployment.

   Debugger is now enabled for your app.

CONSOLE

To enable Debugger by using the Google Cloud Console, complete the following steps:

1. On the Node pools section, select Security, and then select Set access for each API.

2. Enable Debugger.

   

3. Optional: Select Allow full access to all Cloud APIs.

Compute Engine

1. Make sure your Compute Engine instances are created with the access scope option Allow full access to all Cloud APIs, or have one of the following access scopes:

   • https://www.googleapis.com/auth/cloud-platform
   • https://www.googleapis.com/auth/cloud_debugger

2. Add the stackdriver gem to your Gemfile:

   gem "stackdriver"
   

3. Use Bundler to install the gem:

   bundle install
   

4. Enable the agent.

Rails

Bundler automatically loads the library into your app when it starts.

You can optionally provide a service and version through the Ruby on Rails configuration interface:

# Add this to config/environments/*.rb
Rails.application.configure do |config|
  config.google_cloud.debugger.service_name = "SERVICE-NAME"
  config.google_cloud.debugger.service_version = "SERVICE-VERSION"
end

Where:

• SERVICE-NAME is a name for your app, such as MyApp, Backend, or Frontend.
• SERVICE-VERSION is a version, such as v1.0, build_147, or v20170714.

We recommend setting these from environment variables so you do not need to change the source code with each deployment.

Debugger is enabled by default when Rails is running in production mode. To enable Debugger in development mode, add the following:

# Add this to config/environments/development.rb
Rails.application.configure do |config|
  config.google_cloud.use_debugger = true
end

Rack

Use the Rack Middleware provided by the library:

require "google/cloud/debugger"

Google::Cloud::Debugger.configure do |config|
  config.service_name = "SERVICE-NAME"
  config.service_version = "SERVICE-VERSION"
end

use Google::Cloud::Debugger::Middleware

Where:

• SERVICE-NAME is a name for your app, such as MyApp, Backend, or Frontend.
• SERVICE-VERSION is a version, such as v1.0, build_147, or v20170714.

We recommend setting these from environment variables so you do not need to change the source code with each deployment.

Other

For pure Ruby apps, start the agent explicitly at the entry point:

require "google/cloud/debugger"

Google::Cloud::Debugger.new(service_name: "SERVICE-NAME",
                            service_version: "SERVICE-VERSION").start

Where:

• SERVICE-NAME is a name for your app, such as MyApp, Backend, or Frontend.
• SERVICE-VERSION is a version, such as v1.0, build_147, or v20170714.

We recommend setting these from environment variables so you do not need to change the source code with each deployment.

The debugger is now ready for use with your app.

Local and elsewhere

1. Add the stackdriver gem to your Gemfile.

   gem "stackdriver"
   

2. Use Bundler to install the gem:

   bundle install
   

3. Download service account credentials.

   To use the Cloud Debugger agent for Ruby on machines not hosted by Google Cloud, the agent must use a Google Cloud service account credentials to authenticate with the Cloud Debugger Service.

   Use the Cloud Console Service Accounts page to create a credentials file for an existing or new service account. The service account must have at least the Cloud Debugger Agent role.

4. Configure and enable the agent with the downloaded credentials.

Rails

Provide the parameters through the Ruby on Rails configuration interface:

# Add this to config/environments/*.rb
Rails.application.configure do |config|
  config.google_cloud.project_id = "YOUR-PROJECT-ID"
  config.google_cloud.keyfile    = "/path/to/service-account.json"
  config.google_cloud.debugger.service_name = "SERVICE-NAME"
  config.google_cloud.debugger.service_version = "SERVICE-VERSION"
end

Where:

• SERVICE-NAME is a name for your app, such as MyApp, Backend, or Frontend.
• SERVICE-VERSION is a version, such as v1.0, build_147, or v20170714.

We recommend setting these from environment variables so you do not need to change the source code with each deployment.

Debugger is enabled by default when Rails is running in production mode. To enable Debugger in development mode, add the following:

# Add this to config/environments/development.rb
Rails.application.configure do |config|
  config.google_cloud.use_debugger = true
end

Rack

Use the Rack Middleware provided by the library:

require "stackdriver"
require "google/cloud/debugger"

Google::Cloud.configure do |config|
  config.project_id = "YOUR-PROJECT-ID"
  config.keyfile    = "/path/to/service-account.json"
  config.service_name = "SERVICE-NAME"
  config.service_version = "SERVICE-VERSION"
end

use Google::Cloud::Debugger::Middleware

Where:

• SERVICE-NAME is a name for your app, such as MyApp, Backend, or Frontend.
• SERVICE-VERSION is a version, such as v1.0, build_147, or v20170714.

We recommend setting these from environment variables so you do not need to change the source code with each deployment.

Other

For pure Ruby apps, start the agent explicitly at the entry point:

require "google/cloud/debugger"

Google::Cloud::Debugger.new(project: "YOUR-PROJECT-ID",
                            keyfile: "/path/to/service-account.json",
                            service_name: "SERVICE-NAME",
                            service_version: "SERVICE-VERSION").start

Where:

• SERVICE-NAME is a name for your app, such as MyApp, Backend, or Frontend.
• SERVICE-VERSION is a version, such as v1.0, build_147, or v20170714.

We recommend setting these from environment variables so you do not need to change the source code with each deployment.

The debugger is now ready for use with your app.

The Debug page in the Cloud Console can display local source files, without upload, for local development. See Selecting Source Code Manually.

Note: You can find the debugger agent's code and documentation on GitHub.