Adding CN Nodes in Batches

After a cluster is created, the number of required CN nodes varies with workloads. You can add or delete CN nodes as needed.

Other O&M operations cannot be performed during CN addition or deletion.
Services need to be stopped during CN node addition or deletion. You are advised to perform this operation during off-peak hours or when services are interrupted.
If a fault occurs during CN node addition or deletion and the rollback fails, you need to log in to the backend to rectify the fault. For details, see "Cluster Usage" > "Failed to Roll Back CN Addition or Deletion" in Troubleshooting.

For details, see Calling APIs.

POST /v1.0/{project_id}/clusters/{cluster_id}/cns/batch-create

**Table 1** Path Parameters
Parameter	Mandatory	Type	Description
project_id	Yes	String	Definition Project ID. To obtain the value, see Obtaining a Project ID. Constraints N/A Range N/A Default Value N/A
cluster_id	Yes	String	Definition Cluster ID. For details about how to obtain the value, see Obtaining the Cluster ID. Constraints N/A Range N/A Default Value N/A

**Table 2** Request body parameters
Parameter	Mandatory	Type	Description
num	Yes	Integer	Definition Total number of CN nodes in the cluster after new CN nodes are added in batches. The number of CN nodes supported by a cluster depends on the cluster version and number of nodes. For details, see "Querying CN Nodes in a Cluster", where min_num indicates the minimum number of CN nodes, and max_num indicates the maximum number of CN nodes. Constraints N/A Range N/A Default Value N/A

Status code: 200

**Table 3** Response body parameters
Parameter	Type	Description
job_id	String	Definition ID of the task for adding CN nodes in batches. Range N/A

Add three CN nodes in batches.

POST https://{Endpoint}/v1.0/89cd04f168b84af6be287f71730fdb4b/clusters/b5c45780-1006-49e3-b2d5-b3229975bbc7/cns/batch-create

{
  "num" : 3
}

Status code: 200

The CN nodes are successfully added in batches.

{
  "job_id" : "2c908185841339ce018414e9944b0020"
}

Status Code	Description
200	The CN nodes are successfully added in batches.
400	Request error.
401	Authentication failed.
403	You do not have required permissions.
404	No resources found.
500	Internal server error.
503	Service unavailable.