You can call the CreateMasterSlaveServerGroup API to create an active/standby server group. An active/standby server group can only contain two ECS instances. One is the active backend server and the other one is the standby backend server.

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Request parameters

Name Type Required? Example value Description
Action String Yes CreateMasterSlaveServerGroup

The action to perform. Valid value: CreateMasterSlaveServerGroup
LoadBalancerId String Yes lb-bp1hv944r69al4j9jkmvx

The ID of the SLB instance

MasterSlaveBackendServers String Yes [{'ServerId':'vm-233','Port':'80','Weight':'100','ServerType':'Master'},{'ServerId':'vm-232','Port':'90','Weight':'100''ServerType':'Slave'}]

A list of backend servers in the active/standby server group.

An active/standby server group can contain a maximum of two backend servers.

If you do not specify this parameter, an empty list is created.

RegionId String Yes cn-hangzhou

The ID of the region to which the SLB instance belongs

MasterSlaveServerGroupName String No Group1

The name of the active/standby server group

Response parameters

Name Type Example value Description
MasterSlaveServerGroupId String rsp-cige6j5e7p

The ID of the active/standby server group

MasterSlaveBackendServers

A list of backend servers in the active/standby server group

  └ServerId String vm-232

The ID of the ECS instance or ENI to be added

  └Port Integer 90

The port used by the backend server

  └Weight Integer 100

The weight of the backend server

  └ServerType String Slave

The backend server type.

Valid values: Master (default) | Slave
  └Description String A description of the active/standby server group

A description of the active/standby server group

  └Type String ecs

The backend server type. Valid values:

  • ecs: ECS instance (default)
  • eni: Elastic Network Interface (ENI)
RequestId String 9DEC9C28-AB05-4DDF-9A78-6B08EC9CE18C

The ID of the request

Examples

Request example


http(s)://[Endpoint]/? Action=CreateMasterSlaveServerGroup
&LoadBalancerId=lb-bp1hv944r69al4j9jkmvx
&MasterSlaveBackendServers=[{'ServerId':'vm-233','Port':'80','Weight':'100','ServerType':'Master'},{'ServerId':'vm-232','Port':'90','Weight':'100''ServerType':'Slave'}]
&RegionId=cn-hangzhou
&<CommonParameters>

Normal response examples

XML format 

<CreateMasterSlaveServerGroup>
  <RequestId>9DEC9C28-AB05-4DDF-9A78-6B08EC9CE18C</RequestId>
  <MasterSlaveServerGroupId>rsp-cige6j5e7p</MasterSlaveServerGroupId>
  <MasterSlaveBackendServers>
    <MasterSlaveBackendServers>
      <ServerId>vm-233</ServerId>
      <Port>80</Port>
      <Weight>100</Weight>
      <ServerType>Master</ServerType>
    </MasterSlaveBackendServers>
    <MasterSlaveBackendServers>
      <ServerId>vm-232</ServerId>
      <Port>90</Port>
      <Weight>100</Weight>
      <ServerType>Slave</ServerType>
    </MasterSlaveBackendServers>
  </MasterSlaveBackendServers>
</CreateMasterSlaveServerGroup>

JSON format 

{
	"CreateMasterSlaveServerGroup":{
		"MasterSlaveBackendServers":{
			"MasterSlaveBackendServers":[
				{
					"ServerId":"vm-233",
					"Port":"80",
					"Weight":"100",
					"ServerType":"Master"
				},
				{
					"ServerId":"vm-232",
					"Port":"90",
					"Weight":"100",
					"ServerType":"Slave"
				}
			]
		},
		"MasterSlaveServerGroupId":"rsp-cige6j5e7p",
		"RequestId":"9DEC9C28-AB05-4DDF-9A78-6B08EC9CE18C"
	}
}

Error codes

HttpCode Error code Error message Description
400 BACKEND_SERVERS_NUM_MUST_BE_TWO Backend servers num must be 2. The number of backend servers must be 2.
400 BACKEND_SERVERS_HAVE_SAME_PORT_AND_SERVERID Backend servers have same port and serverId. A virtual server with the same port and server ID already exists in the backend VServer group.
400 BACKEND_SERVERS_CAN_ONLY_CONTAIN_ONE_MASTER_AND_ONE_SLAVE Backend servers can only contain one master and one slave. The active/standby server group can contain only one active server and one standby server.
400 BACKEND_SERVER_ID_CAN_NOT_EMPTY Backend server id can not empty. You must enter a backend server ID.
400 INVALID_SERVER_TYPE Invalid server type. The server type is invalid.
400 BACKEND_SERVER_PORT_CAN_NOT_EMPTY Backend server port can not empty. You must specify a backend server port.
400 RealServerPortNotSupport Real server port not support. The backend server port is not supported.

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