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Production Deployment

Deploy FastAPI applications to production environments.

Production Setup​

# main.py
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from fastapi.middleware.trustedhost import TrustedHostMiddleware

app = FastAPI(title="My API", version="1.0.0")

app.add_middleware(
    TrustedHostMiddleware,
    allowed_hosts=["example.com", "*.example.com"]
)

app.add_middleware(
    CORSMiddleware,
    allow_origins=["https://example.com"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

Docker Deployment​

FROM python:3.9-slim

WORKDIR /app

COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

COPY . .

CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]

Gunicorn with Uvicorn​

# Install gunicorn
pip install gunicorn uvicorn[standard]

# Run with gunicorn
gunicorn main:app -w 4 -k uvicorn.workers.UvicornWorker --bind 0.0.0.0:8000

Environment Variables​

import os
from functools import lru_cache
from pydantic import BaseSettings

class Settings(BaseSettings):
    app_name: str = "Awesome API"
    admin_email: str
    items_per_user: int = 50
    database_url: str
    secret_key: str

    class Config:
        env_file = ".env"

@lru_cache()
def get_settings():
    return Settings()