# Add a node to the instance - AddUKafkaInstanceNode

## Overview

Add a node to the instance






## Definition

### Public Parameters

| Parameter Name | Type | Description Information | Required |
|:---|:---|:---|:---|
| **Action**     | string  | Corresponding API command name, the current API is `AddUKafkaInstanceNode`.                      | **Yes** |
| **PublicKey**  | string  | The user's public key can be obtained from [Console](https://console.sigcalcloud.com/uaccount/api_manage)                                             | **Yes** |
| **Signature**  | string  | User signature generated based on public key and API command, see [Signature Algorithm](/docs/api/summary/signature.md)  | **Yes** |

### Request Parameters

| Parameter Name | Type | Description Information | Required |
|:---|:---|:---|:---|
| **Region** | string | area. See [Region and Availability Zone List](/docs/api/summary/regionlist) |**Yes**|
| **Zone** | string | Availability Zone. See [Available Zone List](/docs/api/summary/regionlist) |**Yes**|
| **ProjectId** | string | Project ID. If not filled in, it is the default item, and the sub-account must be filled in. Please refer to [GetProjectList interface](/docs/api/summary/get_project_list) |No|
| **InstanceId** | string | Instance ID |**Yes**|
| **NodeType** | string | Model, supported models can be returned through the GetUKafkaNodeType interface InstanceTypeSet[].InstanceTypeName |**Yes**|
| **NodeCount** | string | Number of newly added nodes |**Yes**|

### Response Field

| Field Name | Type | Description Information | Required |
|:---|:---|:---|:---|
| **RetCode** | int | Return status code. If it is 0, it means successful return. If it is not 0, it means failure. |**Yes**|
| **Action** | string | Operation command name. |**Yes**|
| **Message** | string | Returns an error message, providing detailed description when `RetCode` is non-zero. |No|




## Example

### Request Example
    
```
https://api.sigcalcloud.com/?Action=AddUKafkaInstanceNode
&Region=cn-zj
&Zone=cn-zj-01
&ProjectId=DInOpbYX
&InstanceId=bIwtjuBQ
&NodeType=eCuqWHqj
&NodeCount=JeUgzIeg
```

### Response Example
    
```json
{
  "Action": "AddUKafkaInstanceNodeResponse",
  "Message": "aAIbqNCf",
  "RetCode": 0
}
```