# TestCluster.StartSiloAsync(int, TestClusterOptions, IReadOnlyList<IConfigurationSource>, bool, CancellationToken)

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.testinghost/orleans.testinghost.testcluster/) | [Methods](/orleans/docs/api/csharp/microsoft.orleans.testinghost/orleans.testinghost.testcluster/methods/)

[Source](https://github.com/dotnet/orleans/blob/1644940b035c7bdf215a4fd7135757c06bcfe9ec/src/Orleans.TestingHost/TestCluster.cs)

```csharp
public Task<SiloHandle> StartSiloAsync(int instanceNumber, TestClusterOptions clusterOptions, IReadOnlyList<IConfigurationSource>? configurationOverrides, bool startSiloOnNewPort, CancellationToken cancellationToken)
```

Starts a new silo.

### Parameters

- `instanceNumber` (`int`): The instance number to deploy.
- `clusterOptions` (`TestClusterOptions`): The options to use.
- `configurationOverrides` (`IReadOnlyList<IConfigurationSource>`): Configuration overrides.
- `startSiloOnNewPort` (`bool`): Whether to start this silo on a new port.
- `cancellationToken` (`CancellationToken`): The token used to cancel silo startup.

### Returns

A handle to the deployed silo.