doc-exports/docs/opengauss/api-ref/opengauss_api_0019.html

Adding CNs

Function

This API is used to add CNs.

• Before calling an API, you need to understand the API in Using APIs.
• Before calling this API, obtain the required region and endpoint.

Constraints

• The CN growth increment ranges from 1 to 9.
• The maximum number of CNs is 256.
• If you choose the single-AZ deployment during instance creation, add CNs in the same AZ.
• The number of CNs for a DB instance must be less than or equal to twice the number of shards.

URI

• URI format

  POST https://{Endpoint}/opengauss/v3/{project_id}/instances/{instance_id}/action

• Example

  https://gaussdb.eu-de.otc.t-systems.com/opengauss/v3/0483b6b16e954cb88930a360d2c4e663/instances/dsfae23fsfdsae3435in01/action

• Parameter description

  Table 1 Parameter description

  Name	Mandatory	Description
  project_id	Yes	Specifies the project ID of a tenant in a region. For details about how to obtain the project ID, see Obtaining a Project ID.
  instance_id	Yes	Specifies the DB instance ID.

Request

• Parameter description

  Table 2 Parameter description

  Name	Mandatory	Type	Description
  expand_cluster	Yes	Object	For details, see Table 3.

  Table 3 expand_cluster field data structure description

  Name	Mandatory	Type	Description
  coordinators	Yes	Array	For details, see Table 4.

  Table 4 azCode field data structure description

  Name	Mandatory	Type	Description
  az_code	Yes	String	Specifies the AZ to which CNs are to be added.

• Example request (adding CNs for a single-CN instance)

  {
  	"expand_cluster": {
                  "coordinators": [
                          {
                                 "az_code":"eu-de-01"
                          }
                  ]
  	}
  }

• Example request (adding CNs for a multi-CN instance)

  {
  	"expand_cluster": {
                  "coordinators": [
                          {
                                 "az_code":"eu-de-01"
                          },
                          {
                                 "az_code":"eu-de-01"
                          },
                          {
                                 "az_code":"eu-de-01"
                          }
                  ]
  	}
  }

Response

• Normal response

  Table 5 Parameter description

  Name	Type	Description
  job_id	String	Specifies the task ID.

• Example normal response

  {
  	"job_id": "2b414788a6004883a02390e2eb0ea227"
  }

• Abnormal response

  For details, see Abnormal Request Results.

Status Codes

For details, see Status Codes.

Error Codes

For details, see Error Codes.

Parent topic: DB Instance Management