How to deploy Bun to AWS

Deploy a Bun HTTP server on ECS Fargate behind an Application Load Balancer in your AWS account with Ravion, including autoscaling, HTTPS, and CI/CD.

Deploy a Bun HTTP server on ECS Fargate behind an Application Load Balancer.

Prerequisites

• A Git repository containing your application and its production build command.
• A Ravion account with your AWS account connected. Start free at Ravion signup.
• The Ravion CLI installed and authenticated. See CLI installation.

The examples use my-org/my-app as a placeholder. Replace it with your repository before applying the config.

Set up this Bun app for Ravion ECS hosting.

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Configure the deployment

Bun’s official server API uses Bun.serve and honors PORT when you do not set a port explicitly.

Railpack detects Bun from the packageManager field, engines.bun, or a bun.lock or bun.lockb file. Otherwise it uses its Node.js framework, monorepo, or SPA detection. Set the production start command to your actual Bun entrypoint when it is not inferred from the repository. Ravion injects PORT automatically from container_port.

ravion.yaml

project:
  givenId: bun-app
  name: Bun app
environments:
  - givenId: production
    name: Production
    moduleInstances:
      - givenId: network
        name: Network
        type: rvn-aws-network
        version: 1.0.0
        input:
          aws_account_id: ravion-prod
          aws_region: us-east-1
          name: bun-production
      - givenId: cluster
        name: ECS cluster
        type: rvn-ecs-cluster
        version: 1.0.0
        input:
          network:
            moduleGivenIdRef: network
          name: bun-production
      - givenId: web
        name: Bun web service
        type: rvn-ecs-web
        version: 1.0.0
        input:
          cluster:
            moduleGivenIdRef: cluster
          name: bun-production-web
          build_source: railpack
          source_repo: my-org/my-bun-app
          container_port: 3000
          fargate_size:
            vcpu: 0.5
            memory_gb: 1

Set port: Number(process.env.PORT) || 3000 and hostname: "0.0.0.0" in Bun.serve, and set the runtime start command to your actual Bun entrypoint.

Apply and connect your domain

ravion project create --given-id bun-app --name "Bun app"
ravion project config apply bun-app --file ravion.yaml --dry-run
ravion project config apply bun-app --file ravion.yaml

Follow custom domains to connect your domain to the Application Load Balancer.

Next steps

Custom domains

Point a domain at your deployed service and manage its certificate.

Project config

Preview and apply Ravion configuration from source control.

Pipelines

Add approvals, migrations, and deployment automation.

Logs and metrics

Inspect deploy output and production health in Ravion.