REGION_ID is an abbreviated code that Google assigns
based on the region you select when you create your app. The code does not
correspond to a country or province, even though some region IDs may appear
similar to commonly used country and province codes. Including
REGION_ID.r in App Engine URLs is optional for
existing apps and will soon be required for all new apps.
To ensure a smooth transition, we are slowly updating App Engine to use region IDs. If we haven't updated your Google Cloud project yet, you won't see a region ID for your app. Since the ID is optional for existing apps, you don't need to update URLs or make other changes once the region ID is available for your existing apps.
Learn more about region IDs.
This quickstart shows you how to create a small App Engine app that displays a short message.
Before you begin
- Sign in to your Google Cloud account. If you're new to Google Cloud, create an account to evaluate how our products perform in real-world scenarios. New customers also get $300 in free credits to run, test, and deploy workloads.
In the Google Cloud Console, on the project selector page, select or create a Google Cloud project.
Make sure that billing is enabled for your Cloud project. Learn how to confirm that billing is enabled for your project.
- Enable the Cloud Build API.
- Install and initialize the Cloud SDK.
Initialize your App Engine app with your project and choose its region:
gcloud app create --project=[YOUR_PROJECT_ID]
When prompted, select the region where you want to locate your App Engine application.
Install the following prerequisites:
App Engine locations
App Engine is regional, which means the infrastructure that runs your apps is located in a specific region, and Google manages it so that it is available redundantly across all of the zones within that region.
Meeting your latency, availability, or durability requirements are primary factors for selecting the region where your apps are run. You can generally select the region nearest to your app's users, but you should consider the locations where App Engine is available as well as the locations of the other Google Cloud products and services that your app uses. Using services across multiple locations can affect your app's latency as well as its pricing.
You cannot change an app's region after you set it.
If you already created an App Engine application, you can view its region by doing one of the following:
gcloud app describecommand.
Open the App Engine Dashboard in the Cloud Console. The region appears near the top of the page.
Download the Hello World app
We've created a simple Hello World app for Ruby so you can quickly get a feel for deploying an app to the Google Cloud.
Clone the Hello World sample app repository to your local machine.
git clone https://github.com/GoogleCloudPlatform/ruby-docs-samples
Alternatively, you can download the sample as a zip file and extract it.
Change to the directory that contains the sample code.
Run Hello World on your local machine
This example uses Bundler to run the Hello World app on your local computer:
If you don't already have the Ruby programming language installed, download and install Ruby.
gem install bundler
Install dependencies for this project:
Start a local web server.
bundle exec ruby app.rb -p 8080
In your web browser, enter:
The Hello World message from the sample app displays on the page. In your terminal window, press Ctrl+C to exit the web server.
Deploy and run Hello World on App EngineTo deploy your app to the App Engine flexible environment:
Deploy the Hello World app by running the following command from the
gcloud app deploy
Learn about the optional flags.
--versionflag to specify an ID that uniquely identifies that version of your app, otherwise one is generated for you. Example:
--projectflag to specify an alternate Cloud project ID to what you initialized as the default in the
gcloud app deploy --version pre-prod-5 --project my-sample-app
- Include the
Launch your browser to view the app at
gcloud app browsewhere
PROJECT_IDrepresents your Google Cloud project ID.
This time, the page that displays the Hello World message is delivered by a web server running on an App Engine instance.
Congratulations! You've deployed your first Ruby app to App Engine flexible environment!If you encountered any errors deploying your application, check the troubleshooting tips.
See the following sections for information about cleaning up as well as links to possible next steps that you can take.
To avoid incurring charges, you can delete your Cloud project to stop billing for all the resources used within that project.
- In the Cloud Console, go to the Manage resources page.
- In the project list, select the project that you want to delete, and then click Delete.
- In the dialog, type the project ID, and then click Shut down to delete the project.
Learn the whole platform
Now that you know what it's like to develop and deploy App Engine apps, you can explore the rest of Google Cloud. You already have the Cloud SDK installed which gives you the tools to interact with products like Cloud SQL, Cloud Storage, Firestore, and more.
For a guided walkthrough that teaches you how to create an app that uses the entire platform, not just App Engine, check out our quickstart on creating the Bookshelf app.
Learn about the App Engine flexible environment
Here are some topics to help continue your learning about App Engine.
Hello World code review
Hello World is the simplest possible App Engine app, as it contains only one service, has only one version, and all of the code is located within the app's root directory. This section describes each of the app files in detail.
The Hello World app is a basic one-file Sinatra app:
require "sinatra" get "/" do "Hello world!" end
file describes an app's deployment configuration:
runtime: ruby env: flex entrypoint: bundle exec ruby app.rb # This sample incurs costs to run on the App Engine flexible environment. # The settings below are to reduce costs during testing and are not appropriate # for production use. For more information, see: # https://cloud.google.com/appengine/docs/flexible/ruby/configuring-your-app-with-app-yaml manual_scaling: instances: 1 resources: cpu: 1 memory_gb: 0.5 disk_size_gb: 10
app.yaml specifies the runtime used by
the app, and sets
env: flex, specifying that the app
For more information on how the Ruby runtime works, see The Ruby runtime.
For more details about how to design your app to take advantage of versions and services, see An overview of App Engine.
For more details about the configuration settings for App Engine, see Configuring your app with app.yaml.
source "https://rubygems.org" gem "sinatra"