Configuring the DR Capability for a Primary DB Instance

Function

This API is used to configure DR for a primary DB instance when establishing a cross-cloud or cross-region DR relationship.

• Before calling this API, learn how to authenticate it.
• Before calling this API, learn about request header parameters.

Constraints

• Before using this function, ensure that the network between the VPC CIDR blocks of the DB instances across clouds or regions is connected, and configure security group rules to allow access from database ports in the VPC CIDR blocks. The DR relationship cannot be established if only the network is connected but security group rules are not configured.
• The primary DB instance and DR instance are available and are deployed in different clouds or regions. The primary DB instance is deployed in primary/standby mode and the DR instance is deployed in standalone mode.
• The vCPUs, memory, and storage space of the DR instance must be greater than or equal to those of the primary instance.
• The underlying architecture and major version of the DR instance must be the same as those of the primary DB instance.
• If the DR instance's minor version differs from the primary DB instance, it will automatically update to be the same as that of the primary DB instance after the DR relationship is established.
• Cross-cloud or cross-region DR relationships cannot be established across major versions.
• After the API for configuring DR for the primary instance is called, you cannot change the instance class or perform a primary/standby switchover until the DR relationship is set up.
• After changing the database port or floating IP address of the primary instance, you need to re-establish the DR relationship.
• RDS for PostgreSQL 12 and later versions support cross-cloud or cross-region DR.

URI

• URI format

  POST /v3/{project_id}/instances/{instance_id}/action

• Parameter description

  Table 1 Parameter description

  Name	Mandatory	Description
  project_id	Yes	Project ID of a tenant in a region. To obtain the value, see Obtaining a Project ID.
  instance_id	Yes	Specifies the DB instance ID.

Request

Example Request

POST https://{endpoint}/v3/0483b6b16e954cb88930a360d2c4e663/instances/24c6678f474241fe89ee9c42f768022ein03/action 
{
    "build_master_dr_relation": {
           "target_instance_id":"c39bd176fb0540929f6add80b91b212cin03",
           "target_project_id":"054b61972980d4552f0bc00ac8d3f5cd",
           "target_region":"aaa",
           "target_ip":"192.168.3.238",
           "target_subnet":"192.168.3.1/24"
    }
}

Response

• Normal response

  Table 4 Parameters

  Parameter	Type	Description
  job_id	String	Workflow ID.

• Example normal response

  {
  	"job_id": "184f29cd-be1a-43f1-5b6bc5500e73"
  }

• Abnormal response

  For details, see Abnormal Request Results.

Status Code

• Normal

  200

• Abnormal

  For details, see Status Codes.

Error Code

For details, see Error Codes.