Deployment

Deploying FastAPI applications to production on a VPS requires careful configuration. This step-by-step guide will walk you through the entire process. Prerequisites A VPS with Ubuntu 20.04 or later Domain name (optional but recommended) Basic knowledge of Linux commands Step 1: Server Setup Update System sudo apt update sudo apt upgrade -y Install Python and Dependencies sudo apt install python3.9 python3-pip python3-venv nginx supervisor -y Step 2: Create Application Directory mkdir -p /var/www/myapp cd /var/www/myapp Create Virtual Environment python3 -m venv venv source venv/bin/activate Step 3: Deploy Your Application Install Dependencies pip install fastapi uvicorn[standard] gunicorn Create Application File # main.py from fastapi import FastAPI app = FastAPI() @app.get("/") def read_root(): return {"Hello": "World"} @app.get("/health") def health_check(): return {"status": "healthy"} Step 4: Configure Gunicorn Create gunicorn_config.py: ...

Kubernetes provides several deployment strategies to ensure zero-downtime updates and safe rollouts of new application versions. Understanding these strategies is crucial for maintaining reliable production systems. Deployment strategy overview Kubernetes deployment strategies determine how new versions of your application replace old ones. The choice depends on: Risk tolerance: How critical is zero downtime? Traffic patterns: Can you route traffic to multiple versions? Rollback speed: How quickly can you revert if issues occur? Resource constraints: Can you run multiple versions simultaneously? Rolling update (default) The default Kubernetes deployment strategy gradually replaces old pods with new ones. ...