App Engine vs Compute Engine vs GKE

 

1. What is App Engine?

App Engine is a Google Cloud service that lets you deploy and run your application without having to manage the server yourself.

Suppose you have developed a Java Spring Boot application. Normally, you might need to:

  1. Create a server.

  2. Install Linux.

  3. Install Java.

  4. Configure the server.

  5. Deploy your application.

  6. Monitor the server and manage scaling.

With App Engine, Google manages much of this infrastructure for you. You focus mainly on writing your application and deploying it.

2. Real-life example

Imagine you're building a food delivery application like Swiggy.

Your Java Spring Boot code

Restaurant API, login API, order API

Deploy to App Engine

Google provisions and manages the application runtime

Google runs your application

Hosting, traffic handling and scaling features

Customer uses your app

The app sends HTTP requests to your APIs

For example, a customer requests restaurant details. The request reaches your application running on App Engine, your Java code processes it, and the response goes back to the customer.

You don't have to manually create and maintain the underlying VM for the standard App Engine environment.

3. App Engine vs Compute Engine vs GKE

Imagine all three are ways to run the same Java application.

Compute Engine

You manage the machine.

You rent a kitchen, install the equipment, and cook everything yourself. In cloud terms, you manage the VM, OS and runtime.

App Engine

Google manages most of the hosting infrastructure.

You bring your recipe (application code), and Google provides the managed kitchen and handles much of its operation.

GKE

You deploy containers and Kubernetes manages them.

You manage a coordinated kitchen with multiple cooking stations, containers and rules for how they run.

4. What happens when traffic increases?

Suppose your application usually receives 100 requests per minute, but during a sale it receives 10,000 requests per minute.

App Engine can automatically scale the number of application instances according to the environment and your configuration, helping handle increased traffic. When traffic falls, it can scale down.

You don't have to manually create each server instance.

Keep in mind that scaling settings, limits, startup time and costs depend on your App Engine environment and configuration.

5. Do you need to write different code for App Engine?

Not necessarily. You write your application code as usual, configure it for the supported App Engine environment, and deploy it.

For a typical Java application, the workflow is conceptually:

Write Java / Spring Boot application
              ↓
Configure the deployment
              ↓
Deploy to App Engine
              ↓
Google runs the application
              ↓
Users access your application through a URL

App Engine has Standard and Flexible environments, with different runtime and infrastructure characteristics.

Remember this one line

App Engine = deploy your application while Google manages most of the underlying hosting infrastructure.

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