This quickstart shows you how to create a small App Engine application that displays a short message.
Before running this sample, take the following steps:
The flexible environment requires that billing is configured for your project. If you have not already configured a billing account, you will be prompted to enable billing later in the quickstart.This quickstart demonstrates a simple Ruby application written with the Sinatra web framework that can be deployed to App Engine. Although this sample uses Sinatra, you can use other frameworks such as Ruby on Rails.
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 Google Cloud Platform. Follow these steps from a command line to download Hello World to your local machine.
Download the sample app and navigate into the app directory:
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 machineTo run the Hello World app on your local computer:
Install dependencies for this project by entering the following command:
Start a local web server:
bundle exec ruby app.rb -p 8080
In your web browser, enter the following address:
In your terminal window, press Ctrl+C to exit the web server.
Deploy and run Hello World on App Engine
To deploy your app to the App Engine flexible environment, you need to have a Google Cloud Platform Console project.
Create a project in the Google Cloud Platform Console.
Sign in to your Google account.
If you don't already have one, sign up for a new account.
- In the Cloud Platform Console, go to the Projects page and select or create a new project.
- Enable billing for your project.
- Note the Project ID, since it is used for configuration and deployment.
- Initialize the Cloud SDK
Deploy the app to App Engine
- Deploy the Hello World app:
gcloud app deploy
- Visit the following address to see your deployed app:
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!
- Go to the Cloud Platform Console.
- Select the project you want to shut down, then click Delete project: this schedules the project for deletion.
Learn the whole platform
Now that you know what it's like to develop and deploy App Engine apps, you can stretch out and see the rest of Google Cloud Platform. You already have the Google Cloud SDK installed and that gives you the tools to interact with products like Google Cloud SQL, Google Cloud Storage, Google Cloud Datastore, and more. For a guided walkthrough that teaches you how to create an application 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.
- An Overview Of App Engine
- How Requests are Routed
- How Requests are Handled
- How Instances are Managed
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 very basic one-file Sinatra application:
require "sinatra" get "/" do "Hello world!" end
file describes an application's deployment configuration:
runtime: ruby env: flex entrypoint: bundle exec ruby app.rb -p $PORT
app.yamlspecifies the runtime used by the app, and sets
env: flex, specifying that the app uses the flexible environment.
is used to specify the application's
is used to declare and install dependencies. The Hello World application
requires one Ruby gem: the
source "https://rubygems.org" gem "sinatra"