Description

This API is used to create a read-only instance for an RDS instance.

Number of read-only instances：
  • If the memory of the master instance is greater than or equal to 64 GB, the master instance can have up to ten read-only instances.
  • If the memory of the master instance is less than 64 GB, the master instance can have up to five read-only instances.
  • The master instance must be one of the following:
    • MySQL 5.5
    • MySQL 5.6
    • MySQL 5.7 High-Availability Edition based on local SSDs

Request parameters

Name Type Required or not Description
Action String Yes Required parameter. Value: CreateReadOnlyDBInstance.
RegionId String Yes Region ID, which must be the same as the region of the master instance. You can use the API DescribeRegions to view the region ID list.
ZoneId String Yes Zone ID. You can use the API DescribeRegions to view the zone ID list.
DBInstanceId String Yes ID of the master instance.
EngineVersion String Yes Database version, which must be the same as that of the master instance.
  • 5.6
  • 5.7
DBInstanceClass String Yes Instance type. For more information, see Instance type list.
DBInstanceStorage Integer Yes User-defined storage space. Value range: [5, 1000], 5 GB increments. Unit: GB.
DBInstanceDescription String No
  • Instance description or remarks, no more than 256 bytes. 
  • It cannot begin with http:// or https://. It must start with a Chinese character or an English letter.  It may contain Chinese and English characters/letters, “_”, “-“, and numbers. The length may be 2-256 characters.
PayType String Yes Value: Postpaid
ClientToken String No Used to guarantee idempotence.
InstanceNetworkType String No If no value is specified, a classic instance is created by default.
  • VPC: VPC
  • Classic: classic network
VPCId String No VPC ID.
VSwitchId String No VSwitch ID.
PrivateIpAddress String No IP address of an VPC under VSwitchId. If no value is specified, the system automatically assigns a VPC IP address based on VPCId and VSwitchId.

Return parameters

Name Type Description
<Public return parameters> - For more information, see Public parameters.
DBInstanceId String DB instance ID
OrderId String Order ID
ConnectionString String Database connection address
Port String Port connecting to the database

Request example

https://rds.aliyuncs.com/?Action=CreateReadOnlyDBInstance
&RegionId=cn-hangzhou
&ZoneId=cn-hangzhou-b
&DBInstanceId=rdsaiiabnaiiabn
&EngineVersion=5.6
&DBInstanceClass=rds.mys2.small
&DBInstanceStorage=10
&PayType=Postpaid
&ClientToken=ETnLKlblzczshOTUbOCziJZNwHlYBQ
&<[Public Request Parameters]>

Return example

XML format

<CreateDBInstanceResponse>
     <OrderId>100789370230206</OrderId>
     <ConnectionString>rdsaiiabnaiiabn.mysql.rds.aliyuncs.com </ConnectionString>
     <DBInstanceId>rdsaiiabnaiiabn</DBInstanceId>
     <port>3306</port>
     <RequestId>1E43AAE0-BEE8-43DA-860D-EAF2AA0724DC</RequestId>
</CreateDBInstanceResponse>

JSON format


    "OrderId": "100789370230206", 
    "ConnectionString": "rdsaiiabnaiiabn.mysql.rds.aliyuncs.com", 
    "DBInstanceId": "rdsaiiabnaiiabn", 
    "Port": "3306", 
    "RequestId": "1E43AAE0-BEE8-43DA-860D-EAF2AA0724DC"