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, IP as 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 IP as a 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 where the load balancer resides.
-
If the backend server group supports IPv4/IPv6 dual stack, address can be an IPv4 address or an IPv6 address. If the backend server group supports only IPv4, address can only be an IPv4 address.
-
If type of the backend server is set to instance, address must be a private IP address that is not used by any load balancer.
Calling Method
For details, see Calling APIs.
URI
POST /v3/{project_id}/elb/pools/{pool_id}/members
Parameter |
Mandatory |
Type |
Description |
---|---|---|---|
pool_id |
Yes |
String |
Definition: Specifies the backend server group ID. Constraints: N/A Range: N/A Default value: N/A |
project_id |
Yes |
String |
Definition: Specifies the project ID. For details about how to obtain a project ID, see Obtaining a Project ID. Constraints: N/A Range: The value can contain a maximum of 32 characters, including digits and lowercase letters. Default value: N/A |
Request Parameters
Parameter |
Mandatory |
Type |
Description |
---|---|---|---|
X-Auth-Token |
Yes |
String |
Definition: Specifies the token used for IAM authentication. Constraints: N/A Range: N/A Default value: N/A |
Parameter |
Mandatory |
Type |
Description |
---|---|---|---|
member |
Yes |
CreateMemberOption object |
Definition: Specifies the backend server. Constraints: N/A |
Parameter |
Mandatory |
Type |
Description |
---|---|---|---|
address |
Yes |
String |
Definition: Specifies the IP address of the backend server. Constraints:
Range: N/A Default value: N/A |
admin_state_up |
No |
Boolean |
Definition: Specifies the administrative status of the backend server. Constraints: Although this parameter can be used in the APIs for creating and updating backend servers, its actual value depends on whether ECSs exist. Range: If ECSs exist, the value is true. Otherwise, the value is false. Default value: N/A |
name |
No |
String |
Definition: Specifies the backend server name. Note: The name is not an ECS name. If this parameter is not specified, an empty value will be returned. Constraints: N/A Range: N/A Default value: N/A |
project_id |
No |
String |
Definition: Specifies the project ID of the backend server. Constraints: N/A Range: N/A Default value: N/A |
protocol_port |
No |
Integer |
Definition: Specifies the port used by the backend server to receive requests. Constraints:
Range: N/A Default value: N/A |
subnet_cidr_id |
No |
String |
Definition: Specifies the ID of the IPv4 or IPv6 subnet where the backend server resides. neutron_subnet_id defines IPv4 subnets, and neutron_network_id defines IPv6 subnets. You can query parameter neutron_subnet_id in the response by calling the API (GET https://{VPC_Endpoint}/v1/{project_id}/subnets) to get the IPv4 subnet ID. You can query parameter neutron_network_id in the response by calling the API (GET https://{VPC_Endpoint}/v1/{project_id}/subnets) to get the IPv6 subnet ID. Constraints:
Range: N/A Default value: N/A |
weight |
No |
Integer |
Definition: Specifies the weight of the backend server. Requests are routed based on the load balancing algorithm configured for the backend server group and weights of backend servers. The larger the weight is, the higher proportion of requests the backend server receives. If the weight is set to 0, the backend server will not accept new requests. Constraints: If lb_algorithm is set to SOURCE_IP or QUIC_CID, this parameter will not take effect. Range: 0 to 100. The default value is 1. Default value: N/A |
availability_zone |
No |
String |
Definition: Specifies the AZ of the backend server. Constraints:
Range: AZs available for ECSs in the current region. Default value: N/A |
Response Parameters
Status code: 201
Parameter |
Type |
Description |
---|---|---|
request_id |
String |
Definition: Specifies the request ID. Range: The value is automatically generated, and can contain characters including digits, lowercase letters, and hyphens (-). |
member |
Member object |
Definition: Specifies the backend server. |
Parameter |
Type |
Description |
---|---|---|
id |
String |
Definition: Specifies the backend server ID. Range: N/A
NOTE:
The value of this parameter is not the ID of the server but an ID automatically generated for the backend server that is associated with the load balancer.
|
availability_zone |
String |
Definition: Specifies the AZ where the backend server is running. Range: N/A |
name |
String |
Definition: Specifies the backend server name. Range: N/A Note: The name is not an ECS name. |
project_id |
String |
Definition: Specifies the project ID of the backend server. Range: N/A |
admin_state_up |
Boolean |
Definition: Specifies the administrative status of the backend server. Range: true or false |
subnet_cidr_id |
String |
Definition: Specifies the ID of the IPv4 or IPv6 subnet where the backend server resides. neutron_subnet_id defines IPv4 subnets, and neutron_network_id defines IPv6 subnets. You can query parameter neutron_subnet_id in the response by calling the API (GET https://{VPC_Endpoint}/v1/{project_id}/subnets) to get the IPv4 subnet ID. You can query parameter neutron_network_id in the response by calling the API (GET https://{VPC_Endpoint}/v1/{project_id}/subnets) to get the IPv6 subnet ID. Range: N/A |
protocol_port |
Integer |
Definition: Specifies the port used by the backend server to receive requests. Range: N/A
NOTE:
This parameter can be left blank because it does not take effect if any_port_enable is set to true for a backend server group.
|
weight |
Integer |
Definition: Specifies the weight of the backend server. Requests are routed based on the load balancing algorithm configured for the backend server group and weights of backend servers. The larger the weight is, the higher proportion of requests the backend server receives. If the weight is set to 0, the backend server will not accept new requests. Range: 0 to 100 |
address |
String |
Definition: Specifies the IP address of the backend server Range: N/A |
ip_version |
String |
Definition: Specifies the IP address version supported by the backend server. The version depends on the value of address returned by the system. Range: v4 or v6 |
operating_status |
String |
Definition: Specifies the operating status of the backend server. Range:
Multiple statuses can be used for query in the format of operating_status=xxx&operating_status=xxx. |
status |
Array of MemberStatus objects |
Definition: Specifies the health status of the backend server. Range: N/A |
reason |
Definition: Specifies why health check fails. |
|
created_at |
String |
Definition: Specifies the creation time. The value must be a UTC time in the format of yyyy-MM-dd'T'HH:mm:ss'Z'. Range: N/A Note: This parameter will not be returned for resources associated with existing dedicated load balancers and for resources associated with existing and new shared load balancers. |
updated_at |
String |
Definition: Specifies the update time. The value must be a UTC time in the format of yyyy-MM-dd'T'HH:mm:ss'Z'. Range: N/A Note: This parameter will not be returned for resources associated with existing dedicated load balancers and for resources associated with existing and new shared load balancers. |
member_type |
String |
Definition: Specifies the backend server type. Range:
|
instance_id |
String |
Definition: Specifies the ID of the instance associated with the backend server. If this parameter is left blank, the backend server is not a real device. It may be an IP address. Range: N/A |
Parameter |
Type |
Description |
---|---|---|
listener_id |
String |
Definition: Specifies the listener ID. Range: N/A |
operating_status |
String |
Definition: Specifies the operating status of the backend server. Range:
|
reason |
Definition: Specifies why the health check fails. |
|
created_at |
String |
Definition: Specifies the creation time. The value must be a UTC time in the format of yyyy-MM-dd'T'HH:mm:ss'Z'. Range: N/A |
updated_at |
String |
Definition: Specifies the update time. The value must be a UTC time in the format of yyyy-MM-dd'T'HH:mm:ss'Z'. Range: N/A |
Parameter |
Type |
Description |
---|---|---|
reason_code |
String |
Definition: Specifies the code of the health check failures. Range:
|
expected_response |
String |
Definition: Specifies the expected HTTP status code. This parameter will take effect only when type is set to HTTP, HTTPS, or GRPC. The status code cannot be null if reason_code is RESPONSE_MISMATCH. Range:
|
healthcheck_response |
String |
Definition: Specifies the returned HTTP status code in the response. This parameter will take effect only when type is set to HTTP, HTTPS, or GRPC. The status code cannot be null if reason_code is RESPONSE_MISMATCH. Range:
|
Example Requests
-
Example 1: Adding a backend server
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 2: Adding an IP address as a backend server
POST https://{ELB_Endpoint}/v3/99a3fff0d03c428eac3678da6a7d0f24/elb/pools/36ce7086-a496-4666-9064-5ba0e6840c75/members { "member" : { "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", "status" : [ { "listener_id" : "427eee03-b569-4d6c-b1f1-712032f7ec2d", "operating_status" : "NO_MONITOR" } ], "ip_version" : "v4" }, "request_id" : "f354090d-41db-41e0-89c6-7a943ec50792" }
SDK Sample Code
The SDK sample code is as follows.
-
Example 1: Adding a backend server
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package com.huaweicloud.sdk.test; import com.huaweicloud.sdk.core.auth.ICredential; import com.huaweicloud.sdk.core.auth.BasicCredentials; import com.huaweicloud.sdk.core.exception.ConnectionException; import com.huaweicloud.sdk.core.exception.RequestTimeoutException; import com.huaweicloud.sdk.core.exception.ServiceResponseException; import com.huaweicloud.sdk.elb.v3.region.ElbRegion; import com.huaweicloud.sdk.elb.v3.*; import com.huaweicloud.sdk.elb.v3.model.*; public class CreateMemberSolution { public static void main(String[] args) { // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security. // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment String ak = System.getenv("CLOUD_SDK_AK"); String sk = System.getenv("CLOUD_SDK_SK"); String projectId = "{project_id}"; ICredential auth = new BasicCredentials() .withProjectId(projectId) .withAk(ak) .withSk(sk); ElbClient client = ElbClient.newBuilder() .withCredential(auth) .withRegion(ElbRegion.valueOf("<YOUR REGION>")) .build(); CreateMemberRequest request = new CreateMemberRequest(); request.withPoolId("{pool_id}"); CreateMemberRequestBody body = new CreateMemberRequestBody(); CreateMemberOption memberbody = new CreateMemberOption(); memberbody.withAddress("120.10.10.16") .withName("My member") .withProtocolPort(89) .withSubnetCidrId("c09f620e-3492-4429-ac15-445d5dd9ca74"); body.withMember(memberbody); request.withBody(body); try { CreateMemberResponse response = client.createMember(request); System.out.println(response.toString()); } catch (ConnectionException e) { e.printStackTrace(); } catch (RequestTimeoutException e) { e.printStackTrace(); } catch (ServiceResponseException e) { e.printStackTrace(); System.out.println(e.getHttpStatusCode()); System.out.println(e.getRequestId()); System.out.println(e.getErrorCode()); System.out.println(e.getErrorMsg()); } } }
-
Example 2: Adding an IP address as a backend server
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package com.huaweicloud.sdk.test; import com.huaweicloud.sdk.core.auth.ICredential; import com.huaweicloud.sdk.core.auth.BasicCredentials; import com.huaweicloud.sdk.core.exception.ConnectionException; import com.huaweicloud.sdk.core.exception.RequestTimeoutException; import com.huaweicloud.sdk.core.exception.ServiceResponseException; import com.huaweicloud.sdk.elb.v3.region.ElbRegion; import com.huaweicloud.sdk.elb.v3.*; import com.huaweicloud.sdk.elb.v3.model.*; public class CreateMemberSolution { public static void main(String[] args) { // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security. // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment String ak = System.getenv("CLOUD_SDK_AK"); String sk = System.getenv("CLOUD_SDK_SK"); String projectId = "{project_id}"; ICredential auth = new BasicCredentials() .withProjectId(projectId) .withAk(ak) .withSk(sk); ElbClient client = ElbClient.newBuilder() .withCredential(auth) .withRegion(ElbRegion.valueOf("<YOUR REGION>")) .build(); CreateMemberRequest request = new CreateMemberRequest(); request.withPoolId("{pool_id}"); CreateMemberRequestBody body = new CreateMemberRequestBody(); CreateMemberOption memberbody = new CreateMemberOption(); memberbody.withAddress("120.10.10.16") .withName("My member") .withProtocolPort(89); body.withMember(memberbody); request.withBody(body); try { CreateMemberResponse response = client.createMember(request); System.out.println(response.toString()); } catch (ConnectionException e) { e.printStackTrace(); } catch (RequestTimeoutException e) { e.printStackTrace(); } catch (ServiceResponseException e) { e.printStackTrace(); System.out.println(e.getHttpStatusCode()); System.out.println(e.getRequestId()); System.out.println(e.getErrorCode()); System.out.println(e.getErrorMsg()); } } }
-
Example 1: Adding a backend server
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# coding: utf-8 import os from huaweicloudsdkcore.auth.credentials import BasicCredentials from huaweicloudsdkelb.v3.region.elb_region import ElbRegion from huaweicloudsdkcore.exceptions import exceptions from huaweicloudsdkelb.v3 import * if __name__ == "__main__": # The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security. # In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment ak = os.environ["CLOUD_SDK_AK"] sk = os.environ["CLOUD_SDK_SK"] projectId = "{project_id}" credentials = BasicCredentials(ak, sk, projectId) client = ElbClient.new_builder() \ .with_credentials(credentials) \ .with_region(ElbRegion.value_of("<YOUR REGION>")) \ .build() try: request = CreateMemberRequest() request.pool_id = "{pool_id}" memberbody = CreateMemberOption( address="120.10.10.16", name="My member", protocol_port=89, subnet_cidr_id="c09f620e-3492-4429-ac15-445d5dd9ca74" ) request.body = CreateMemberRequestBody( member=memberbody ) response = client.create_member(request) print(response) except exceptions.ClientRequestException as e: print(e.status_code) print(e.request_id) print(e.error_code) print(e.error_msg)
-
Example 2: Adding an IP address as a backend server
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# coding: utf-8 import os from huaweicloudsdkcore.auth.credentials import BasicCredentials from huaweicloudsdkelb.v3.region.elb_region import ElbRegion from huaweicloudsdkcore.exceptions import exceptions from huaweicloudsdkelb.v3 import * if __name__ == "__main__": # The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security. # In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment ak = os.environ["CLOUD_SDK_AK"] sk = os.environ["CLOUD_SDK_SK"] projectId = "{project_id}" credentials = BasicCredentials(ak, sk, projectId) client = ElbClient.new_builder() \ .with_credentials(credentials) \ .with_region(ElbRegion.value_of("<YOUR REGION>")) \ .build() try: request = CreateMemberRequest() request.pool_id = "{pool_id}" memberbody = CreateMemberOption( address="120.10.10.16", name="My member", protocol_port=89 ) request.body = CreateMemberRequestBody( member=memberbody ) response = client.create_member(request) print(response) except exceptions.ClientRequestException as e: print(e.status_code) print(e.request_id) print(e.error_code) print(e.error_msg)
-
Example 1: Adding a backend server
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package main import ( "fmt" "github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic" elb "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/elb/v3" "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/elb/v3/model" region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/elb/v3/region" ) func main() { // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security. // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment ak := os.Getenv("CLOUD_SDK_AK") sk := os.Getenv("CLOUD_SDK_SK") projectId := "{project_id}" auth := basic.NewCredentialsBuilder(). WithAk(ak). WithSk(sk). WithProjectId(projectId). Build() client := elb.NewElbClient( elb.ElbClientBuilder(). WithRegion(region.ValueOf("<YOUR REGION>")). WithCredential(auth). Build()) request := &model.CreateMemberRequest{} request.PoolId = "{pool_id}" nameMember:= "My member" protocolPortMember:= int32(89) subnetCidrIdMember:= "c09f620e-3492-4429-ac15-445d5dd9ca74" memberbody := &model.CreateMemberOption{ Address: "120.10.10.16", Name: &nameMember, ProtocolPort: &protocolPortMember, SubnetCidrId: &subnetCidrIdMember, } request.Body = &model.CreateMemberRequestBody{ Member: memberbody, } response, err := client.CreateMember(request) if err == nil { fmt.Printf("%+v\n", response) } else { fmt.Println(err) } }
-
Example 2: Adding an IP address as a backend server
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package main import ( "fmt" "github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic" elb "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/elb/v3" "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/elb/v3/model" region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/elb/v3/region" ) func main() { // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security. // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment ak := os.Getenv("CLOUD_SDK_AK") sk := os.Getenv("CLOUD_SDK_SK") projectId := "{project_id}" auth := basic.NewCredentialsBuilder(). WithAk(ak). WithSk(sk). WithProjectId(projectId). Build() client := elb.NewElbClient( elb.ElbClientBuilder(). WithRegion(region.ValueOf("<YOUR REGION>")). WithCredential(auth). Build()) request := &model.CreateMemberRequest{} request.PoolId = "{pool_id}" nameMember:= "My member" protocolPortMember:= int32(89) memberbody := &model.CreateMemberOption{ Address: "120.10.10.16", Name: &nameMember, ProtocolPort: &protocolPortMember, } request.Body = &model.CreateMemberRequestBody{ Member: memberbody, } response, err := client.CreateMember(request) if err == nil { fmt.Printf("%+v\n", response) } else { fmt.Println(err) } }
For SDK sample code of more programming languages, see the Sample Code tab in API Explorer. SDK sample code can be automatically generated.
Status Codes
Status Code |
Description |
---|---|
201 |
Successful request. |
Error Codes
See Error Codes.
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