Use DescribeUserData to query user data of an ECS instance - Elastic Compute Service - Alibaba Cloud - Elastic Compute Service

Operation description

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

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Test

RAM authorization

The table below describes the authorization required to call this API. You can define it in a Resource Access Management (RAM) policy. The table's columns are detailed below:

Action: The actions can be used in the Action element of RAM permission policy statements to grant permissions to perform the operation.
API: The API that you can call to perform the action.
Access level: The predefined level of access granted for each API. Valid values: create, list, get, update, and delete.
Resource type: The type of the resource that supports authorization to perform the action. It indicates if the action supports resource-level permission. The specified resource must be compatible with the action. Otherwise, the policy will be ineffective.
- For APIs with resource-level permissions, required resource types are marked with an asterisk (*). Specify the corresponding Alibaba Cloud Resource Name (ARN) in the Resource element of the policy.
- For APIs without resource-level permissions, it is shown as All Resources. Use an asterisk (*) in the Resource element of the policy.
Condition key: The condition keys defined by the service. The key allows for granular control, applying to either actions alone or actions associated with specific resources. In addition to service-specific condition keys, Alibaba Cloud provides a set of common condition keys applicable across all RAM-supported services.
Dependent action: The dependent actions required to run the action. To complete the action, the RAM user or the RAM role must have the permissions to perform all dependent actions.

Action

Access level

Resource type

Condition key

Dependent action

ecs:DescribeUserData

get

*Instance

acs:ecs:{#regionId}:{#accountId}:instance/{#instanceId}

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 elements

Element	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. Note If no user data is configured for the instance, an empty string is returned.	ZWNobyBoZWxsbyBlY321ABC
RegionId	string	The region ID of the instance.	cn-hangzhou

Examples

Success response

JSON format

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

Error response

JSON format

{
    "RequestId": "540CFF28-407A-40B5-B6A5-74Bxxxxxxxxx", 
    "HostId": "ecs.aliyuncs.com",
    "Code": "IncompleteSignature",
    "Message": "The request signature does not conform to Aliyun standards."
}

Error codes

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

See Error Codes for a complete list.

Release notes

See Release Notes for a complete list.