# ModifyInstancesAttribute

## 1. API Description

This API (ModifyInstancesAttribute) is used to the API is used to modify the attributes of one or more virtual machine instances. Only the instance name to be displayed can be modified for now.

{% hint style="info" %} <mark style="color:blue;">**Note**</mark>

* <mark style="color:blue;">Batch operations are supported. Each request can modify up to 100 instances.</mark>
* <mark style="color:blue;">If any of the instance IDs does not exist, the operation will fail immediately.</mark>
  {% endhint %}

## 2. Input Parameters

The following request parameter list only provides API request parameters.

| Parameter Name | Required | Type            | Description                                                                                                                                                                                    |
| -------------- | -------- | --------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| instanceIds    | Yes      | Array of String | <p>Instance ID(s).</p><p>To obtain the instance IDs, you can call DescribeInstances and look for instanceId in the response.</p><p>The maximum number of instances in each request is 100.</p> |
| instanceName   | Yes      | String          | <p>Instance name to be displayed.</p><p>This parameter can contain up to 64 characters. Only letters, numbers, - and periods (.) are supported.</p>                                            |

## 3. Output Parameters

| Parameter Name | Type   | Description                                                                                                           |
| -------------- | ------ | --------------------------------------------------------------------------------------------------------------------- |
| requestId      | String | <p>The unique request ID, which is returned for each request.</p><p>RequestId is required for locating a problem.</p> |

## 4. Code Example

{% tabs %}
{% tab title="Example" %}
**Modify names of two instances to `myInstanceName`.**

```json
POST /api/v2/vm HTTP/1.1
Host: console.zenlayer.com
Content-Type: application/json
X-ZC-Action: ModifyInstancesAttribute
<Common Request Params>

Request:
{
  "instanceIds": [
    "instanceId1",
    "instanceId2"
  ],
  "instanceName": "myInstanceName"
}

Response:
{
  "requestId": "TC1748D3E-452D-4F74-8485-7AA73718E453",
  "response": {
    "requestId": "TC1748D3E-452D-4F74-8485-7AA73718E453"
  }
}
```

{% endtab %}
{% endtabs %}

## 5. Developer Resources

Zenlayer Cloud API 2.0 integrates [SDKs](/api-reference/api-introduction/toolkit/api-sdk.md)，to make it easier for you to call APIs. More programming languages will be supported.

## 6. Error Codes

The following only lists the error codes related to the API business logic. For other error codes, see [Common Error Codes](/api-reference/api-introduction/instruction/commonerrorcode.md).

| HTTP Status Code | Error Code                    | Description              |
| ---------------- | ----------------------------- | ------------------------ |
| 404              | INVALID\_INSTANCE\_NOT\_FOUND | Instance does not exist. |


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.console.zenlayer.com/api-reference/compute/vm/virtual-machine-instance/modifyinstancesattribute.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.