Guide: Zero-Downtime NestJS Deployment on DigitalOcean Using GitLab CI/CD and PM2

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A detailed production-grade walkthrough has been published for deploying a NestJS backend to DigitalOcean with zero downtime. The setup uses Ubuntu 24.04, Node.js v18, PM2 in cluster mode, and Nginx as a reverse proxy, with GitLab CI/CD automating the deployment pipeline. The guide recommends installing Node.js directly from official binaries rather than using NodeSource scripts, which can install unintended versions. Security best practices are emphasized, including running deployments under a dedicated non-root user called 'deployer' instead of root. The walkthrough also covers SSL configuration via Certbot and proper Nginx proxy settings to ensure uninterrupted request handling during deployments.

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