You can call ScaleOutCluster to add worker nodes to a cluster. Worker nodes in a cluster can be deployed in multiple zones.


OpenAPI Explorer automatically calculates the signature value. For your convenience, we recommend that you call this operation in OpenAPI Explorer. OpenAPI Explorer dynamically generates the sample code of the operation for different SDKs.

Request parameter types

This operation uses only common request parameters. For more information, see Common parameters.

Request syntax

post /api/v2/clusters/{ClusterId} http|https

Request parameters

Parameter Type Required Example Description
ClusterId String Yes c82e6987e2961451182edacd74faf****

The ID of the cluster.

count Integer No 3

The number of worker nodes that you want to add.

worker_instance_charge_type String No PrePaid

The billing method of worker nodes. Valid values:

  • PrePaid: subscription.
  • PostPaid: pay-as-you-go.

Default value: PostPaid.

worker_period Integer No 1

The subscription duration of worker nodes. This parameter takes effect and is required only if worker_instance_charge_type is set to PrePaid. If worker_period_unit is set to Month, valid values of worker_period include 1, 2, 3, 6, and 12.

worker_period_unit String No Month

The unit of the subscription duration. This parameter is required if worker_instance_charge_type is set to PrePaid. A value of Month specifies that the subscription duration is measured in months.

worker_auto_renew Boolean No true

Specifies whether to enable auto renewal for worker nodes. Valid values:

  • true: enables auto renewal.
  • false: disables auto renewal.
worker_auto_renew_period Integer No 6

The auto renewal period for worker nodes. This parameter takes effect and is required only if worker_instance_charge_type is set to PrePaid and worker_auto_renew is set to true. If worker_period_unit is set to Month, valid values of worker_auto_renew_period include 1, 2, 3, 6, and 12.

worker_system_disk_category String No cloud_efficiency

The system disk type of worker nodes.

worker_system_disk_size Integer No 120

The system disk size of a worker node. Unit: GiB.

worker_data_disk Boolean No true

Specifies whether to mount data disks to worker nodes. Valid values:

  • true: mounts data disks.
  • false: does not mount data disks.
key_pair String No secrity-key

The name of the key pair. You must set key_pair or login_password.

login_password String No Hello@1234

The SSH logon password. The password must be 8 to 30 characters in length and contain a minimum of three of the following character types: uppercase letters, lowercase letters, digits, and special characters. You must set login_password or key_pair.

cloud_monitor_flags Boolean No true

Specifies whether to install the Cloud Monitor agent.

cpu_policy String No none

The CPU management policy. For Kubernetes 1.12.6 and later, valid values of cpu_policy include static and none. Default value: none.

disable_rollback Boolean No true

Specifies whether to retain all resources if the operation fails.

image_id String No ""

The ID of the image. By default, a system image is used. You can also specify a custom image to replace the system image. For more information, see .Use a custom image to create an ACK cluster

user_data String No ""

The user data of the node. You can run batch or PowerShell scripts on Windows-based ECS instances. Before you perform Base64 encoding, make sure that the first line includes [bat] or [powershell]. Linux-based ECS instances support shell scripts. For more information about supported formats, see User data formats and Prepare user data.

If your script file is larger than 1 KB, we recommend that you upload the script to Object Storage Service (OSS) and pull the script through the internal endpoint of the OSS bucket.

You can run scripts to create a cluster or add nodes to a cluster. After requests are sent, you must check whether the execution of scripts succeeds.

runtime Object No

The runtime of containers.

name String No docker

The name of the container runtime.

version String No 19.03.5

The version of the container runtime.

vswitch_ids Array of String No vsw-2ze4jvvvade1yk899****

The IDs of VSwitches.

worker_instance_types Array of String No ecs.c5.xlarge

The ECS instance types of worker nodes.

rds_instances Array of String No rm-2zev748xi27xc****

The Relational Database Service (RDS) instances.

worker_data_disks Array No

The data disk configurations of worker nodes.

category String No cloud_ssd

The type of data disks.

encrypted String No false

Specifies whether to encrypt data disks.

size String No 120

The size of a data disk.

tags Array No

The tags of the cluster.

key String No tier

The key of the tag.

value String No frontend

The value of the tag.

taints Array No

The taints to be added to the nodes.

effect String No NoSchedule

The scheduling policy.

key String No node_type

The key of the taint.

value String No prod

The value of the taint.

Response parameters

Parameter Type Example Description
cluster_id String "c82e6987e2961451182edacd74faf****"

The ID of the cluster.

request_id String "687C5BAA-D103-4993-884B-C35E4314A1E1"

The ID of the request.

task_id String "T-5a54309c80282e39ea00002f"

The ID of the task.


Sample requests

POST /api/v2/clusters/[ClusterId] HTTP/1.1
Common request parameters

Sample success responses

XML format


JSON format

    "cluster_id": "c82e6987e2961451182edacd74faf****",
    "task_id": "T-5a54309c80282e39ea00002f",
    "request_id": "687C5BAA-D103-4993-884B-C35E4314A1E1"

Error codes

For a list of error codes, visit the API Error Center.