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Ali Mahdavi
Ali Mahdavi

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Deploying a High-Availability NestJS API on Decentralized Infra

#webdev #nestjs #runonflux

If you're running NestJS in production, you've likely faced the classic dilemma: go with the ease of a PaaS but pay the "convenience tax," or manage your own clusters to save money but lose hours to DevOps.

Lately, I’ve been experimenting with a third way: Decentralized Infrastructure.

I moved a NestJS microservice over to Flux Cloud using their Deploy with Git feature. It gives you the "push-to-deploy" workflow we love, but instead of hitting a single corporate data center, your API is distributed across multiple independent nodes globally.

Here is the technical breakdown of how to set this up and why the architecture is actually pretty clever for backend devs.

Why a Decentralized Backend?

  1. Native High Availability: When you deploy on Flux, your app isn't on one server. It’s spawned across multiple separate, independent global nodes. If one provider goes offline, the network routing keeps your API reachable.
  2. Predictable Scaling: Because it’s a peer-to-peer resource network, the costs for CPU and RAM are significantly lower and more stable than the "pay-as-you-go" surprises from the Big 3.
  3. Zero-Downtime Rollbacks: The deployment engine handles the versioning. If a new push fails a health check, it automatically rolls back to the last stable version.

Step 1: Framework Preparation

NestJS works seamlessly here because it follows standard Node.js patterns. Ensure your package.json includes the production build and start scripts:

"scripts": {
"build": "nest build",
"start:prod": "node dist/main"
}

Step 2: Handling Environment & Ports

One thing to watch for is port assignment. NestJS usually defaults to 3000, but you should ensure your main.ts is flexible enough to pick up the environment port:

async function bootstrap() {
const app = await NestFactory.create(AppModule);
await app.listen(process.env.PORT || 3000);
}
bootstrap();

Step 3: Linking to the Network

Instead of writing complex configuration files from scratch, you can use the Git-deploy flow:

  1. Connect your GitHub repository in the Flux dashboard.
  2. The network automatically detects the NestJS environment.
  3. It builds the project and propagates it to the nodes.

The Result: A "Self-Healing" API

What I like most about this setup is the resilience. In a traditional VPS setup, if the hardware fails, you're down until you manually intervene. Here, the network's "supervisor" keeps the app alive across the peer-to-peer nodes.

Useful Docs:

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