Adding a Backend Server¶
Function¶
This API is used to add a backend server.
Constraints¶
When you add backend servers, note the following:
Two backend servers in the same backend server group must have different IP addresses and ports.
If no subnets are specified during cloud server creation, cross-VPC backend servers can be added. In this case, address must be set to an IPv4 address, the protocol of the backend server group must be TCP, HTTP, or HTTPS, and cross-VPC backend must have been enabled for the load balancer.
If a subnet is specified during cloud server creation, the subnet must be in the same VPC as the subnet from which the virtual IP address bound to the load balancer is assigned.
If the backend server group supports IPv4/IPv6 dual stack, address can be an IPv4 or IPv6 address. The value of address depends on the IP address version of the backend server group.
URI¶
POST /v3/{project_id}/elb/pools/{pool_id}/members
Parameter | Mandatory | Type | Description |
---|---|---|---|
pool_id | Yes | String | Specifies the ID of the backend server group. |
project_id | Yes | String | Specifies the project ID. |
Request Parameters¶
Parameter | Mandatory | Type | Description |
---|---|---|---|
X-Auth-Token | Yes | String | Specifies the token used for IAM authentication. |
Parameter | Mandatory | Type | Description |
---|---|---|---|
member | Yes | CreateMemberOption object | Specifies request parameters for creating a backend server. |
Parameter | Mandatory | Type | Description |
---|---|---|---|
address | Yes | String | Specifies the IP address of the backend server.
Minimum: 1 Maximum: 64 |
admin_state_up | No | Boolean | Specifies the administrative status of the backend server. Although this parameter can be used in the APIs for creating and updating backend servers, its actual value depends on whether cloud servers exist. If cloud servers exist, the value is true. Otherwise, the value is false. |
name | No | String | Specifies the backend server name. Minimum: 0 Maximum: 255 |
project_id | No | String | Specifies the project ID. Minimum: 1 Maximum: 32 |
protocol_port | Yes | Integer | Specifies the port used by the backend server to receive requests. Minimum: 1 Maximum: 65535 |
subnet_cidr_id | No | String | Specifies the ID of the subnet where the backend server works. This subnet must be in the same VPC as the subnet of the load balancer with which the backend server is associated. Only IPv4 subnets are supported. This parameter is mandatory if cross-VPC backend is disabled. If this parameter is left blank, cross-VPC backend servers can be added. In this case, IP addresses of these servers must be IPv4 addresses, the protocol of the backend server group must be TCP, HTTP, or HTTPS, and cross-VPC backend must have been enabled for the load balancer. Minimum: 1 Maximum: 36 |
weight | No | Integer | Specifies the weight of the backend server. Requests are routed to backend servers in the same backend server group based on their weights. If the weight is 0, the backend server will not accept new requests. This parameter is invalid when lb_algorithm is set to SOURCE_IP for the backend server group that contains the backend server. Minimum: 0 Maximum: 100 Default: 1 |
Response Parameters¶
Status code: 201
Parameter | Type | Description |
---|---|---|
request_id | String | Specifies the request ID. The value is automatically generated. |
member | Member object | Specifies the backend server. |
Parameter | Type | Description |
---|---|---|
address | String | Specifies the IP address of the backend server. The IP address must be in the subnet specified by subnet_cidr_id, for example, 192.168.3.11. The IP address can only be the IP address of the primary NIC. |
admin_state_up | Boolean | Specifies the administrative status of the backend server. Although this parameter can be used in the APIs for creating and updating backend servers, its actual value depends on whether cloud servers exist. If cloud servers exist, the value is true. Otherwise, the value is false. Default: true |
id | String | Specifies the backend server ID. |
name | String | Specifies the backend server name. |
operating_status | String | Specifies the operating status of the backend server. The value can be one of the following:
|
project_id | String | Specifies the project ID. |
protocol_port | Integer | Specifies the port used by the backend server to receive requests. Minimum: 1 Maximum: 65535 |
subnet_cidr_id | String | Specifies the ID of the subnet where the backend server works. This subnet must be in the VPC as the subnet of the load balancer associated with the backend server. Only IPv4 subnets are supported. If the value is left blank, the backend server is not in the load balancer's VPC. |
weight | Integer | Specifies the weight of the backend server. Requests are routed to backend servers in the same backend server group based on their weights. If the weight is 0, the backend server will not accept new requests. This parameter is invalid when lb_algorithm is set to SOURCE_IP for the backend server group that contains the backend server. Minimum: 0 Maximum: 100 Default: 1 |
ip_version | String | This is a read-only attribute, which is automatically generated based on the address parameter. The value can be v4 or v6. Default: v4 |
Example Requests¶
POST
https://{elb_endpoint}/v3/99a3fff0d03c428eac3678da6a7d0f24/elb/pools/36ce7086-a496-4666-9064-5ba0e6840c75/members
{
"member" : {
"subnet_cidr_id" : "c09f620e-3492-4429-ac15-445d5dd9ca74",
"protocol_port" : 89,
"name" : "My member",
"address" : "120.10.10.16"
}
}
Example Responses¶
Status code: 201
Successful request.
{
"member" : {
"name" : "My member",
"weight" : 1,
"admin_state_up" : false,
"subnet_cidr_id" : "c09f620e-3492-4429-ac15-445d5dd9ca74",
"project_id" : "99a3fff0d03c428eac3678da6a7d0f24",
"address" : "120.10.10.16",
"protocol_port" : 89,
"id" : "1923923e-fe8a-484f-bdbc-e11559b1f48f",
"operating_status" : "NO_MONITOR",
"ip_version" : "v4"
},
"request_id" : "f354090d-41db-41e0-89c6-7a943ec50792"
}
Status Codes¶
Status Code | Description |
---|---|
201 | Successful request. |
Error Codes¶
See Error Codes.