Deploy App Engine in Google Cloud

#command #tutorial #GCP

Deploying a Python script on Google Cloud Platform (GCP) using App Engine involves several steps. App Engine is a fully managed, serverless platform that lets you build and deploy applications on Google's infrastructure. Here's a step-by-step guide to deploying a Python script:

Prerequisites

Google Cloud Account: Make sure you have a GCP account. If you don't, you can sign up for one here.
Billing Enabled: Ensure that your account has billing enabled.
Google Cloud SDK: Install the Google Cloud SDK, which provides you the command-line tools (gcloud) for interacting with GCP services. You can download it here. or install with Homebrew google-cloud-sdk

Steps to Deploy a Python Script on App Engine

1. Initialize Google Cloud SDK

Open your command-line interface (CLI).
Run gcloud init to initialize the gcloud environment. This sets up your GCP project and authentication.

2. Create a GCP Project

If you don’t already have a GCP project, create one using the command:
```
gcloud projects create [YOUR_PROJECT_ID] --set-as-default
```
Replace [YOUR_PROJECT_ID] with your desired project ID.

3. Enable App Engine

Enable App Engine in your project:

gcloud app create --project=[YOUR_PROJECT_ID]

Choose a region for your application.

4. Prepare Your Python Application

Ensure your Python script is ready for deployment. Typically, you need at least two files:
- main.py: Your Python script.
- app.yaml: A configuration file for App Engine.
Create an app.yaml file in the same directory as your Python script with the following content:
```
runtime: python39  # or any other supported runtime
entrypoint: python main.py
```

or this

runtime: python39
entrypoint: gunicorn -b :$PORT main:app
# if you use this make sure you also install gunicorn !!!!!

Make sure your script meets the requirements for App Engine, like using supported libraries and respecting sandbox limitations.

5. Deploy Your Application

Navigate to your project directory in the CLI.
Deploy your application using:
```
gcloud app deploy
```
Follow the prompts to deploy your application.

6. Access Your Application

Once deployed, you can access your application using the URL provided by App Engine, typically in the format https://[YOUR_PROJECT_ID].appspot.com.

7. Monitor Your Application

You can monitor and manage your application using the GCP Console or the gcloud command-line tool.

Additional Tips

If your Python script requires external libraries, include a requirements.txt file with the names of these libraries.
Test your application locally using the App Engine local development environment before deploying.
Familiarize yourself with App Engine’s pricing and quota limits to manage your application's cost and usage effectively.