How to Host Flask Applications

Introduction

This guide covers deploying Flask applications on Shard Cloud. Flask is a lightweight WSGI web framework for Python.

Creating Your Project

Ensure you have Python and pip installed. Download from python.org.

Installing Flask

pip install flask gunicorn

Basic Flask Application

Create an app.py file:

app.py

from flask import Flask

app = Flask(__name__)

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

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=80)

Requirements File

Create a requirements.txt:

requirements.txt

flask
gunicorn

Production Server with Gunicorn

Flask’s built-in server is not suitable for production. Always use Gunicorn.

Shard Cloud Configuration

Create a .shardcloud file:

.shardcloud

DISPLAY_NAME=Flask API
DESCRIPTION=Python Flask Application
MAIN=app.py
MEMORY=512
VERSION=recommended
SUBDOMAIN=my-flask-api

For production with Gunicorn:

.shardcloud

DISPLAY_NAME=Flask API
DESCRIPTION=Python Flask Application
LANGUAGE=python
MEMORY=512
VERSION=recommended
SUBDOMAIN=my-flask-api
CUSTOM_COMMAND=gunicorn --bind 0.0.0.0:80 --workers 2 app:app

Deploying

Prepare Your Files

Ensure you have: - app.py - requirements.txt - .shardcloud

Exclude Unnecessary Files

Remove: __pycache__/, venv/, *.pyc

Create ZIP Archive

Compress your project folder.

Upload to Shard Cloud

Go to Shard Cloud Dashboard and upload.

Additional Resources

Visit the official Flask documentation for more information.

Troubleshooting

ModuleNotFoundError

Ensure all dependencies are listed in requirements.txt.

Application not accessible

Verify you’re binding to 0.0.0.0 and port 80.

Introduction

Platform Features

Bot Platforms

API Frameworks

Website Frameworks

How to Host Flask Applications

Introduction

Creating Your Project

Installing Flask

Basic Flask Application

Requirements File

Production Server with Gunicorn

Shard Cloud Configuration

Deploying

Additional Resources

Troubleshooting

​Introduction

​Creating Your Project

​Installing Flask

​Basic Flask Application

​Requirements File

​Production Server with Gunicorn

​Shard Cloud Configuration

​Deploying

​Additional Resources

​Troubleshooting

Introduction

Creating Your Project

Installing Flask

Basic Flask Application

Requirements File

Production Server with Gunicorn

Shard Cloud Configuration

Deploying

Additional Resources

Troubleshooting