# HostingExtensions.UseCosmosGatewayListProvider(IClientBuilder)

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.clustering.cosmos/orleans.hosting.hostingextensions/) | [Methods](/orleans/docs/api/csharp/microsoft.orleans.clustering.cosmos/orleans.hosting.hostingextensions/methods/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Azure/Orleans.Clustering.Cosmos/HostingExtensions.cs#L73-L75)

```csharp
public static IClientBuilder UseCosmosGatewayListProvider(this IClientBuilder builder)
```

Adds clustering backed by Azure Cosmos DB.

### Parameters

- `builder` (`IClientBuilder`): The client builder.

### Returns

The provided `builder`.