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

[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/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.TestingHost/TestCluster.cs)

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

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 we start this silo on a new port, instead of the default one

### Returns

A handle to the deployed silo.