# FleetOverflowBehavior

The compute fleet overflow behavior.

- Source: [`aws-codebuild/lib/fleet.ts`](https://github.com/aws/aws-cdk/blob/v2.274.0/packages/aws-cdk-lib/aws-codebuild/lib/fleet.ts#L596)
- Type last changed: v2.219.0 · 1 Oct 2025

## Example

```ts
const fleet = new codebuild.Fleet(this, 'Fleet', {
  computeType: codebuild.FleetComputeType.MEDIUM,
  environmentType: codebuild.EnvironmentType.LINUX_CONTAINER,
  baseCapacity: 1,
  overflowBehavior: codebuild.FleetOverflowBehavior.ON_DEMAND,
});
```

## Members

| Member | Description |
| --- | --- |
| `QUEUE` | Overflow builds wait for existing fleet instances to become available. |
| `ON_DEMAND` | Overflow builds run on CodeBuild on-demand instances. |

## Referenced by

- [`FleetProps`](/v2/docs/aws-cdk-lib.aws_codebuild.FleetProps).overflowBehavior