A complete, battle-tested guide to deploying a NestJS application to a DigitalOcean Droplet using GitLab CI/CD pipelines and PM2 cluster mode for zero-downtime deployments.
Deploying a NestJS backend to production with true zero downtime is more involved than most guides suggest. This is a complete, battle-tested walkthrough — built from real production experience — covering everything from Droplet setup to automated GitLab pipelines that deploy without dropping a single request.
Stack:
Server: DigitalOcean Droplet (Ubuntu 24.04)
Runtime: Node.js v18
Process Manager: PM2 (cluster mode)
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