How to query custom data of an ECS instance using Base64 encoding

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DescribeUserdata

Query the custom data of an ECS instance.

Description

The returned instance custom data will be displayed in Base64 encoding.

If no custom data exists for the instance, a null value is returned.

Request parameters

##Return parameters

Example

Request Example

https://ecs.aliyuncs.com/?Action= DescribeUserdata
&RegionId=cn-shenzhen
&InstanceId=i-instance1
&<公共请求参数>

https://ecs.example.com/?Action= DescribeUserdata
&RegionId=cn-shenzhen
&InstanceId=i-instance1
&<公共请求参数>

Return example

XML format

<DescribeUserdataResponse>
    <RequestId>473469C7-AA6F-4DC5-B3DB-A3DC0DE3C83E</RequestId>
    <UserData>userdata1</UserData>
    <InstanceId> i-instance1</InstanceId>
    <RegionId> cn-shenzhen </RegionId>
</DescribeUserdataResponse>

JSON format

{
    "RequestId": "473469C7-AA6F-4DC5-B3DB-A3DC0DE3C83E"
    " UserData ": " userdata1"
    " InstanceId ": " i-instance1"
    " RegionId": "cn-shenzhen"
}

Error code

The following are error codes unique to this interface. For more error codes, please visit the API Error Center.

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