DescribeUserData - Elastic Compute Service - Alibaba Cloud Documentation Center

Queries the user data of an Elastic Compute Service (ECS) instance.

Operation description

If no user data is configured for the ECS instance, an empty string is returned.

Debugging

You can run this interface directly in OpenAPI Explorer, saving you the trouble of calculating signatures. After running successfully, OpenAPI Explorer can automatically generate SDK code samples.

Debug

Authorization information

The following table shows the authorization information corresponding to the API. The authorization information can be used in the Action policy element to grant a RAM user or RAM role the permissions to call this API operation. Description:

Operation: the value that you can use in the Action element to specify the operation on a resource.
Access level: the access level of each operation. The levels are read, write, and list.
Resource type: the type of the resource on which you can authorize the RAM user or the RAM role to perform the operation. Take note of the following items:
- The required resource types are displayed in bold characters.
- If the permissions cannot be granted at the resource level, All Resources is used in the Resource type column of the operation.
Condition Key: the condition key that is defined by the cloud service.
Associated operation: other operations that the RAM user or the RAM role must have permissions to perform to complete the operation. To complete the operation, the RAM user or the RAM role must have the permissions to perform the associated operations.

Operation	Access level	Resource type	Condition key	Associated operation
ecs:DescribeUserData	get	*Instance `acs:ecs:{#regionId}:{#accountId}:instance/{#instanceId}`	none	none

Request parameters

Parameter	Type	Required	Description	Example
RegionId	string	Yes	The region ID of the instance. You can call the DescribeRegions operation to query the most recent region list.	cn-hangzhou
InstanceId	string	Yes	The ID of the instance.	i-bp14bnftyqhxg9ij****

Response parameters

Parameter	Type	Description	Example
	object
RequestId	string	The request ID.	473469C7-AA6F-4DC5-B3DB-A3DC0DE3C83E
InstanceId	string	The instance ID.	i-bp14bnftyqhxg9ij****
UserData	string	The user data of the instance.	ZWNobyBoZWxsbyBlY321ABC
RegionId	string	The region ID of the instance.	cn-hangzhou

Examples

Sample success responses

JSONformat

{
  "RequestId": "473469C7-AA6F-4DC5-B3DB-A3DC0DE3C83E",
  "InstanceId": "i-bp14bnftyqhxg9ij****",
  "UserData": "ZWNobyBoZWxsbyBlY321ABC",
  "RegionId": "cn-hangzhou"
}

Error codes

HTTP status code	Error code	Error message	Description
404	InvalidInstanceId.NotFound	The specified InstanceId does not exist.	The specified instance does not exist.

For a list of error codes, visit the Service error codes.

Change history

Change time	Summary of changes	Operation

No change history