Deploying Flask App on GCP App Engine

This guide will walk you through the steps to deploy a Flask application, like the provided main.py, on Google Cloud Platform's App Engine.

Prerequisites

• A Google Cloud Platform account.
• Google Cloud SDK installed on your local machine.

Getting Started

1. Rename Your Application File: Ensure that your Flask application file is named main.py.

2. App Engine Configuration File: Create an app.yaml file in the same directory as your main.py. This file is used to configure your App Engine environment.

3. Update Cloud SDK: Run the following command to update all the installed components of the Google Cloud SDK to the latest version:

   gcloud components update
   

4. Create a GCP Project: If you haven't already, create a new project on Google Cloud Platform. Note down the PROJECT_ID.

5. Enable App Engine Admin API: Enable the App Engine Admin API for your project. This is required for deploying applications.

6. Authenticate Your Account: Authenticate your GCP account with the following command:

   gcloud auth login
   
   gcloud init
   

7. Set Project ID: Configure gcloud to use your project with the following command:

   gcloud config set project PROJECT_ID
   

   Replace PROJECT_ID with your actual GCP project ID.

8. Deploy the Application: Navigate to your application directory where main.py and app.yaml are located. Run the following command to deploy your application:

   gcloud app deploy
   

   Follow the on-screen prompts to complete the deployment.

9. Access Your Application: Once the deployment is successful, you can access your application using the following command:

   gcloud app browse
   

Delete the App Engine Service

Once a default app is deployed to GCP App Engine, you can't delete it. You can turn it off and deploy an app with no code, but you can't delete it, if you deployed an empty version you can go ahead and delete the older version.

Disable the Service

Navigate to App Engine from the console, go to Settings then Disable Application.

Additional Information

• Make sure you are in the correct directory where your main.py and app.yaml files are located before running the deployment commands.
• For more detailed information and troubleshooting, refer to the Google Cloud App Engine Documentation.

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