Setting Up Stackdriver Debugger for Ruby

Beta

This product or feature is in a pre-release state and might change or have limited support. For more information, see Product launch stages.

Note: Stackdriver Debugger is available for Ruby versions 2.2 or greater.

This page describes how to configure your environment and your Ruby application to use Stackdriver Debugger. For some environments, you must explicitly specify the access scope to let the Stackdriver Debugger agent send data. We recommend setting the broadest possible access scope and then using Cloud 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.

Before you begin

To begin using Debugger, ensure the Debugger API is enabled.
Enable Debugger API

Note: Debugger is free to use. However, you need a Google Cloud Platform project with billing enabled before you can use 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 Platform 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 using the console, complete the following steps:

1. After selecting your cluster type, click More options from the Node pools pane:

   

2. Select one of the following from the Security pane:

   • Allow full access to all Cloud APIs.

   • Allow access for each API and then select Enabled for Cloud Debugger.

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

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