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Elastic Compute Service:ModifyDedicatedHostAttribute

Last Updated:Mar 19, 2024

Modifies some properties of a dedicated host, such as the name, description, and instance migration policy that is applied when the dedicated host fails.

Operation description

Description

  • All the Elastic Compute Service (ECS) instances that are hosted on a dedicated host must be in the Stopped (Stopped) state before you can modify the CPU overcommit ratio of the dedicated host.
  • Modifications to the CPU overcommit ratio of a dedicated host do not affect the operation of the dedicated host. After the CPU overcommit ratio is modified, the number of allocated vCPUs on the dedicated host cannot exceed the new total number of vCPUs. Otherwise, ECS instances that use the excess vCPUs cannot start.

Debugging

OpenAPI Explorer automatically calculates the signature value. For your convenience, we recommend that you call this operation in OpenAPI Explorer.

Authorization information

There is currently no authorization information disclosed in the API.

Request parameters

ParameterTypeRequiredDescriptionExample
RegionIdstringYes

The region ID of the dedicated host. You can call the DescribeRegions operation to query the most recent region list.

cn-hangzhou
DedicatedHostIdstringYes

The ID of the dedicated host.

dh-bp165p6xk2tlw61e****
DedicatedHostNamestringNo

The name of the dedicated host. The name must be 2 to 128 characters in length. It must start with a letter and cannot start with http:// or https://. The name can contain digits, letters, colons (:), underscores (_), and hyphens (-).

testDedicatedHostName
DescriptionstringNo

The description of the dedicated host. The description must be 2 to 256 characters in length and cannot start with http:// or https://.

testDescription
ActionOnMaintenancestringNo

The policy for migrating the instances deployed on the dedicated host when the dedicated host fails or needs to be repaired online. Valid values:

  • Migrate: The instances are migrated to another physical machine and then restarted.
  • Stop: The instances are stopped. If the dedicated host cannot be repaired, the instances are migrated to another physical machine and then restarted.

If the dedicated host has cloud disks attached, the default value is Migrate.

If the dedicated host has local disks attached, the default value is Stop.

Migrate
NetworkAttributes.SlbUdpTimeoutintegerNo

The timeout period for a UDP session between a Server Load Balancer (SLB) instance and the dedicated host. Unit: seconds. Valid values: 15 to 310.

60
NetworkAttributes.UdpTimeoutintegerNo

The timeout period for a UDP session between a user and an Alibaba Cloud service on the dedicated host. Unit: seconds. Valid values: 15 to 310.

60
AutoPlacementstringNo

Specifies whether to add the dedicated host to the resource pool for automatic deployment. If you do not specify the DedicatedHostId parameter when you create an instance on a dedicated host, Alibaba Cloud automatically selects a dedicated host from the resource pool to host the instance. Valid values:

  • on: adds the dedicated host to the resource pool for automatic deployment.
  • off: does not add the dedicated host to the resource pool for automatic deployment.

For information about automatic deployment, see Features .

on
DedicatedHostClusterIdstringNo

The ID of the dedicated host cluster to which the dedicated host belongs.

dc-bp165p6xk2tlw61e****
CpuOverCommitRatiofloatNo

The CPU overcommit ratio. You can configure CPU overcommit ratios only for the following dedicated host types: g6s, c6s, and r6s. Valid values: 1 to 5.

The CPU overcommit ratio affects the number of available vCPUs on a dedicated host. You can use the following formula to calculate the number of available vCPUs on a dedicated host: Number of available vCPUs = Number of physical CPU cores × 2 × CPU overcommit ratio. For example, the number of physical CPU cores on each g6s dedicated host is 52. If you change the CPU overcommit ratio of a g6s dedicated host to 4, the number of available vCPUs on the dedicated host is 416. For scenarios that have minimal requirements for CPU stability or where CPU load is not heavy, such as development and test environments, you can increase the number of available vCPUs on a dedicated host by increasing the CPU overcommit ratio. This way, you can deploy more ECS instances of the same specifications on the dedicated host and reduce the unit deployment cost.

1

Response parameters

ParameterTypeDescriptionExample
object
RequestIdstring

The ID of the request.

2A4EA075-CB5B-41B7-B0EB-70D339F6****

Examples

Sample success responses

JSONformat

{
  "RequestId": "2A4EA075-CB5B-41B7-B0EB-70D339F6****"
}

Error codes

HTTP status codeError codeError messageDescription
400InvalidDedicatedHostName.MalformedThe specified parameter DedicatedHostName is not valid.-
400InvalidDescription.MalformedThe specified parameter Description is not valid.The resource description is invalid. The description must be 2 to 256 characters in length and cannot start with http:// or https://.
400InvalidParameter.SlbUdpTimeoutThe specified value is invalid.The specified SlbUdpTimeout parameter is invalid.
400InvalidParameter.UdpTimeoutThe specified value is invalid.The specified UdpTimeout parameter is invalid.
400InvalidDedicatedHostType.CpuOverCommitRatioNotSupported%s-
400InvalidCpuOverCommitRatio.ValueNotSupported%s-
403InvalidUser.UnauthorizedThe user is not authorizedYou are not authorized to perform this operation.
404InvalidDedicatedHostId.NotFoundThe specified DedicatedHostId does not exist.-
404InvalidDedicatedHostClusterId.NotFoundThe specified DedicatedHostClusterId does not exist.-
404InvalidDedicatedHostClusterId.ExceedMaxSizeThe specified Dedicated Host Cluster exceeded max capacity.-
404InvalidDedicatedHostClusterId.NotMatchThe specified DedicatedHostCluster does not match request.-

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

Change history

Change timeSummary of changesOperation
2023-09-04The Error code has changedsee changesets
Change itemChange content
Error CodesThe Error code has changed.
    Error Codes 404 change
    delete Error Codes: 400
    delete Error Codes: 403