Querying Backend Servers
Function
This API is used to query all backend servers.
Constraints
This API has the following constraints:
-
Parameters marker, limit, and page_reverse are used for pagination query.
-
Parameters marker and page_reverse take effect only when they are used together with parameter limit.
Calling Method
For details, see Calling APIs.
URI
GET /v3/{project_id}/elb/pools/{pool_id}/members
Parameter |
Mandatory |
Type |
Description |
---|---|---|---|
project_id |
Yes |
String |
Specifies the project ID. |
pool_id |
Yes |
String |
Specifies the ID of the backend server group. |
Parameter |
Mandatory |
Type |
Description |
---|---|---|---|
marker |
No |
String |
Specifies the ID of the last record on the previous page. Note:
|
limit |
No |
Integer |
Specifies the number of records on each page. The value ranges from 0 to 2,000, and the default value is 2,000. |
page_reverse |
No |
Boolean |
Specifies whether to use reverse query. Values:
Note:
|
name |
No |
Array of strings |
Specifies the backend server name. Multiple names can be queried in the format of name=xxx&name=xxx. |
weight |
No |
Array of integers |
Specifies the weight of the backend server. Requests are routed to backend servers in the same backend server group based on their weights. The value ranges from 0 to 100. 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. Multiple weights can be queried in the format of weight=xxx&weight=xxx. |
admin_state_up |
No |
Boolean |
Specifies the administrative status of the backend server. The value can be true or false. Although this parameter can be used in the APIs for creating and updating backend servers, its actual value depends on whether ECSs exist. If ECSs exist, the value is true. Otherwise, the value is false. |
subnet_cidr_id |
No |
Array of strings |
Specifies the ID of the IPv4 or IPv6 subnet where the backend server resides. Multiple IDs can be queried in the format of subnet_cidr_id=xxx&subnet_cidr_id=xxx. |
address |
No |
Array of strings |
Specifies the IP address bound to the backend server. Multiple IP addresses can be queried in the format of address=xxx&address=xxx. |
protocol_port |
No |
Array of integers |
Specifies the port used by the backend server to receive requests. Multiple ports can be queried in the format of protocol_port=xxx&protocol_port=xxx. |
id |
No |
Array of strings |
Specifies the backend server ID. Multiple IDs can be queried in the format of id=xxx&id=xxx. |
operating_status |
No |
Array of strings |
Specifies the operating status of the backend server. The value can be one of the following:
Multiple operating statuses can be queried in the format of operating_status=xxx&operating_status=xxx. |
enterprise_project_id |
No |
Array of strings |
Specifies the enterprise project ID.
Multiple IDs can be queried in the format of enterprise_project_id=xxx&enterprise_project_id=xxx. |
ip_version |
No |
Array of strings |
Specifies the IP version supported by the backend server. The value can be v4 (IPv4) or v6 (IPv6). |
member_type |
No |
Array of strings |
Specifies the type of the backend server. The value can be:
|
instance_id |
No |
Array of strings |
Specifies the ID of the instance associated with the backend server. If this parameter is left blank, the backend server is not an ECS. It may be an IP address. Multiple instance id can be queried in the format of instance_id=xxx&instance_id=xxx. |
Request Parameters
Parameter |
Mandatory |
Type |
Description |
---|---|---|---|
X-Auth-Token |
Yes |
String |
Specifies the token used for IAM authentication. |
Response Parameters
Status code: 200
Parameter |
Type |
Description |
---|---|---|
request_id |
String |
Specifies the request ID. Note: The value is automatically generated. |
page_info |
PageInfo object |
Shows pagination information. |
members |
Array of Member objects |
Lists the backend servers. |
Parameter |
Type |
Description |
---|---|---|
previous_marker |
String |
Specifies the ID of the first record in the pagination query result. |
next_marker |
String |
Specifies the ID of the last record in the pagination query result. |
current_count |
Integer |
Specifies the number of records. |
Parameter |
Type |
Description |
---|---|---|
id |
String |
Specifies the backend server ID.
NOTE:
The value of this parameter is not the ID of the server but an ID automatically generated for the backend server that has already associated with the load balancer. |
name |
String |
Specifies the backend server name. Note: The name is not an ECS name. |
project_id |
String |
Specifies the project ID of the backend server. |
admin_state_up |
Boolean |
Specifies the administrative status of the backend server. The value can be true or false. Although this parameter can be used in the APIs for creating and updating backend servers, its actual value depends on whether ECSs exist. If ECSs exist, the value is true. Otherwise, the value is false. |
subnet_cidr_id |
String |
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 parameters neutron_subnet_id and neutron_network_id in the response by calling the API GET https://{VPC_Endpoint}/v1/{project_id}/subnets to get the IPv4 subnet ID and IPv6 subnet ID respectively. Notes and constraints:
|
protocol_port |
Integer |
Specifies the port used by the backend server to receive requests. Notes and constraints:
|
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. The value ranges from 0 to 100, and the default value is 1. 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. If lb_algorithm is set to SOURCE_IP or QUIC_CID, this parameter will not take effect. |
address |
String |
Specifies the private IP address bound to the backend server. Notes and constraints:
|
ip_version |
String |
Specifies the IP version supported by the backend server. The value can be v4 (IPv4) or v6 (IPv6), depending on the value of address returned by the system. |
operating_status |
String |
Specifies the health status of the backend server if listener_id under status is not specified. The value can be one of the following:
|
status |
Array of MemberStatus objects |
Specifies the health status of the backend server if listener_id is specified. |
created_at |
String |
Specifies the time when the forwarding policy was added. The format is yyyy-MM-dd'T'HH:mm:ss'Z' (UTC time). This is a new field in this version, and it 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 |
Specifies the time when the forwarding policy was updated. The format is yyyy-MM-dd'T'HH:mm:ss'Z' (UTC time). This is a new field in this version, and it 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 |
Specifies the type of the backend server. The value can be:
|
instance_id |
String |
Specifies the ID of the ECS used as the backend server. If this parameter is left blank, the backend server is not an ECS. For example, it may be an IP address. |
Parameter |
Type |
Description |
---|---|---|
listener_id |
String |
Specifies the listener ID. |
operating_status |
String |
Specifies the health status of the backend server if listener_id under status is not specified. The value can be one of the following:
|
Example Requests
Querying backend servers in a given backend server group
GET https://{ELB_Endpoint}/v3/99a3fff0d03c428eac3678da6a7d0f24/elb/pools/36ce7086-a496-4666-9064-5ba0e6840c75/members
Example Responses
Status code: 200
Successful request.
{ "members" : [ { "name" : "quark-neutron", "weight" : 100, "admin_state_up" : false, "subnet_cidr_id" : "c09f620e-3492-4429-ac15-445d5dd9ca74", "project_id" : "99a3fff0d03c428eac3678da6a7d0f24", "address" : "120.10.10.2", "protocol_port" : 2100, "id" : "0aa23a52-1ac2-4a2d-8dfa-1e11cb26079d", "operating_status" : "NO_MONITOR", "ip_version" : "v4" }, { "name" : "quark-neutron", "weight" : 100, "admin_state_up" : false, "subnet_cidr_id" : "c09f620e-3492-4429-ac15-445d5dd9ca74", "project_id" : "99a3fff0d03c428eac3678da6a7d0f24", "address" : "120.10.10.2", "protocol_port" : 2101, "id" : "315b928b-39e4-4d5f-8e48-39e9108c1035", "operating_status" : "NO_MONITOR", "ip_version" : "v4" }, { "name" : "quark-neutron", "weight" : 100, "admin_state_up" : false, "subnet_cidr_id" : "27e4ab69-a5ed-46c6-921a-5212be19ce87", "project_id" : "99a3fff0d03c428eac3678da6a7d0f24", "address" : "2001:db8:a583:6a::4", "protocol_port" : 2101, "id" : "53976f72-d2aa-47f5-baf4-4906ed6b42d6", "operating_status" : "NO_MONITOR", "ip_version" : "v6" } ], "page_info" : { "previous_marker" : "0aa23a52-1ac2-4a2d-8dfa-1e11cb26079d", "current_count" : 3 }, "request_id" : "87e29592-7ab8-401a-9bf4-66cf6747eab9" }
SDK Sample Code
The SDK sample code is as follows.
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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 ListMembersSolution { 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(); ListMembersRequest request = new ListMembersRequest(); request.withPoolId("{pool_id}"); try { ListMembersResponse response = client.listMembers(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()); } } } |
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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 = ListMembersRequest() request.pool_id = "{pool_id}" response = client.list_members(request) print(response) except exceptions.ClientRequestException as e: print(e.status_code) print(e.request_id) print(e.error_code) print(e.error_msg) |
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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.ListMembersRequest{} request.PoolId = "{pool_id}" response, err := client.ListMembers(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 |
---|---|
200 |
Successful request. |
Error Codes
See Error Codes.
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