Deploy your Flask API on GCP Cloud Run 🚀

Hey, there!! Do you wanna deploy your flask Api on GCP(Google Cloud Platform)? Here are simple and easy steps.

Step 1: Set Up Your Flask Application

Ensure your Flask application has the following structure:

/flask-app
  ├── app.py                  # Your main Flask application
  ├── requirements.txt        # Python dependencies
  ├── Dockerfile              # Docker configuration

Example app.py:

from flask import Flask, request, jsonify

app = Flask(__name__)

@app.route('/')
def home():
    return "Hello, World!"

@app.route('/api', methods=['POST'])
def api():
    data = request.get_json()
    return jsonify({"message": "Data received", "data": data}), 200

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=8080)

Example requirements.txt:

# Step 1: Use Python base image
FROM python:3.10-slim

# Step 2: Set working directory
WORKDIR /app

# Step 3: Copy application files
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

COPY . .

# Step 4: Expose the port and specify the startup command
EXPOSE 8080
CMD ["gunicorn", "-b", "0.0.0.0:8080", "app:app"]

Step 2: Create an Artifact Registry Repository

1. Enable Artifact Registry in your Google Cloud project:
   gcloud services enable artifactregistry.googleapis.com

2. Create a Docker repository in Artifact Registry:
   

gcloud artifacts repositories create flask-repo \
    --repository-format=docker \
    --location=us-central1 \
    --description="Repository for Flask application"

1. Authenticate Docker with Artifact Registry: gcloud auth configure-docker us-central1-docker.pkg.dev

Step 3: Build and Push the Docker Image

1. Build the Docker image:
   docker build -t us-central1-docker.pkg.dev/<PROJECT_ID>/flask-repo/flask-app:v1 .
   Replace with your Google Cloud project ID.

2. Push the Docker image to Artifact Registry:
   docker push us-central1-docker.pkg.dev/<PROJECT_ID>/flask-repo/flask-app:v1

Step 4: Deploy to Cloud Run

1. Deploy the image to Cloud Run:

gcloud run deploy flask-app \
    --image us-central1-docker.pkg.dev/<PROJECT_ID>/flask-repo/flask-app:v1 \
    --platform managed \
    --region us-central1 \
    --allow-unauthenticated

1. Note the URL provided after deployment. Your Flask app will now be accessible via this URL.

Step 5: Verify the Deployment

1. Access the Application: Visit the Cloud Run service URL in your browser or use curl:
   curl https://<CLOUD_RUN_SERVICE_URL>

2. Check Logs: If anything goes wrong, inspect the logs:
   gcloud logs read --platform run --region us-central1 --service flask-app

Step 6: Clean Up (Optional)

If you no longer need the service, delete it to avoid unnecessary charges:

gcloud run services delete flask-app --region us-central1

These steps ensure a smooth workflow for deploying Flask applications to Google Cloud Run with Artifact Registry. Thank You!!