DescribeInstanceVncUrl - Elastic Compute Service - Alibaba Cloud Documentation Center

Queries the Virtual Network Computing (VNC) logon address of an Elastic Compute Service (ECS) instance.

Operation description

You cannot directly use the VNC logon address (VncUrl) in the response to log on to an ECS instance. To log on to the ECS instance, you can use the web management terminal URL that contains the VNC logon address.

Note To construct a web management terminal URL, add the vncUrl=\*\*\*\*, instanceId=****, and isWindows=true/false parameters at the end of https://g.alicdn.com/aliyun/ecs-console-vnc2/0.0.8/index.html?. Separate each parameter with an ampersand (&). Parameter description:

vncUrl: the VNC logon address.
instanceId: the instance ID.
isWindows: specifies whether the operating system of your ECS instance is Windows. A value of true specifies that the operating system is Windows. A value of false specifies that the operating system is not Windows.
You can connect to an ECS instance without using a VNC logon password. Therefore, you do not need to specify the password parameter.
The keepalive time of a connection to a VNC management terminal is 300 seconds. If you do not interact with the VNC management terminal within 300 seconds, the VNC management terminal is automatically disconnected.
If the connection is interrupted, you must call the DescribeInstanceVncUrl operation to obtain a new VNC logon address (VncUrl) and use the new logon address to construct a new web management terminal URL that you can use to reconnect to the VNC management terminal. You can reconnect to a VNC management terminal up to 30 times per minute.

Sample web management terminal URL:

https://g.alicdn.com/aliyun/ecs-console-vnc2/0.0.8/index.html?vncUrl=ws%3A%2F%****&instanceId=i-wz9hhwq5a6tm****&isWindows=true

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:DescribeInstanceVncUrl	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 list of regions.	cn-hangzhou
InstanceId	string	Yes	The ID of the instance	i-bp1hzoinajzkh91h****

Response parameters

Parameter	Type	Description	Example
	object
VncUrl	string	The VNC logon address. Note The VNC logon address returned is valid only for 15 seconds. If a connection is not established within 15 seconds after a successful call, the VNC logon address expires and you must call the DescribeInstanceVncUrl operation to obtain a new logon address.	wss%3A%2F%2Fhz01-vncproxy.aliyun.com%2Fwebsockify%2F%3Fs%3DDvh%252FIA%252BYc73gWO48cBx2gBxUDVzaAnSKr74pq30mzqUYgeUMcB%252FbkNixDxdEA996
RequestId	string	The ID of the request.	473469C7-AA6F-4DC5-B3DB-A3DC0DE3C83E

Examples

Sample success responses

JSONformat

{
  "VncUrl": "wss%3A%2F%2Fhz01-vncproxy.aliyun.com%2Fwebsockify%2F%3Fs%3DDvh%252FIA%252BYc73gWO48cBx2gBxUDVzaAnSKr74pq30mzqUYgeUMcB%252FbkNixDxdEA996",
  "RequestId": "473469C7-AA6F-4DC5-B3DB-A3DC0DE3C83E"
}

Error codes

HTTP status code	Error code	Error message	Description
400	InvalidRegionInstance	The specified InstanceId does not exist in given region.	The instance does not exist in the specified region.
403	IncorrectInstanceStatus	The current status of the resource does not support this operation.	The resource is in a state that does not support the current operation.
403	InstanceNotReady	The specified instance is not ready for use	The specified instance is not available. Check to see if the instance status is preventing this action and try again later.
403	InstanceNotReady	Temporarily unable to connect the specified instance,please try later.	-
404	InvalidRegionId.NotFound	The specified RegionId does not exist.	The specified region ID does not exist.
404	InvalidInstanceId.NotFound	The specified InstanceId does not exist.	The specified instance does not exist.
500	InternalError	The request processing has failed due to some unknown error.	An internal error has occurred. Try again later.

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

Change history

Change time	Summary of changes	Operation

No change history