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

**Table 1** Path Parameters
Parameter	Mandatory	Type	Description
project_id	Yes	String	Specifies the project ID.
pool_id	Yes	String	Specifies the ID of the backend server group.

**Table 2** Query Parameters
Parameter	Mandatory	Type	Description
marker	No	String	Specifies the ID of the last record on the previous page. Note: This parameter must be used together with limit. If this parameter is not specified, the first page will be queried. This parameter cannot be left blank or set to an invalid ID.
limit	No	Integer	Specifies the number of records on each page. Minimum: 0 Maximum: 2000 Default: 2000
page_reverse	No	Boolean	Specifies whether to use reverse query. Values: true: Query the previous page. false (default): Query the next page. Note: This parameter must be used together with limit. If page_reverse is set to true and you want to query the previous page, set the value of marker to the value of previous_marker.
name	No	Array	Specifies the backend server name. Multiple names can be queried in the format of name=xxx&name=xxx.
weight	No	Array	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 cloud servers exist. If cloud servers exist, the value is true. Otherwise, the value is false.
subnet_cidr_id	No	Array	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	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	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	Specifies the backend server ID. Multiple IDs can be queried in the format of id=xxx&id=xxx.
operating_status	No	Array	Specifies the health status of the backend server. The value can be one of the following: ONLINE: The backend server is running normally. NO_MONITOR: No health check is configured for the backend server group to which the backend server belongs. OFFLINE: The cloud server used as the backend server is stopped or does not exist. Multiple operating statuses can be queried in the format of operating_status=xxx&operating_status=xxx.
enterprise_project_id	No	Array	Specifies the enterprise project ID. If this parameter is not passed, resources in the default enterprise project are queried, and authentication is performed based on the default enterprise project. If this parameter is passed, its value can be the ID of an existing enterprise project (resources in the specific enterprise project are required) or all_granted_eps (resources in all enterprise projects are queried). Multiple IDs can be queried in the format of enterprise_project_id=xxx&enterprise_project_id=xxx.
ip_version	No	Array	Specifies the IP version supported by the backend server. The value can be v4 (IPv4) or v6 (IPv6).
member_type	No	Array	Specifies the type of the backend server. Values: ip: IP as backend servers instance: ECSs used as backend servers Multiple values can be queried in the format of member_type=xxx&member_type=xxx.
instance_id	No	Array	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

**Table 3** Request header parameters
Parameter	Mandatory	Type	Description
X-Auth-Token	Yes	String	Specifies the token used for IAM authentication.

Response Parameters

Status code: 200

**Table 4** Response body parameters
Parameter	Type	Description
request_id	String	Specifies the request ID. The value is automatically generated.
page_info	PageInfo object	Shows pagination information.
members	Array of Member objects	Lists the backend servers.

**Table 5** PageInfo
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.

**Table 6** Member
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.
pool_id	String	Specifies the ID of the backend server group to which the backend server belongs. This parameter is unsupported. Please do not use it.
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 cloud servers exist. If cloud servers exist, the value is true. Otherwise, the value is false.
subnet_cidr_id	String	Specifies the ID of the subnet where the backend server resides. It can be an ID of an IPv4 or IPv6 subnet. If you use an IPv4 subnet, you can query parameter neutron_subnet_id in the response by calling the API (GET https://{VPC_Endpoint}/v1/{project_id}/subnets) to obtain the ID of the IPv4 subnet. If you use an IPv6 subnet, you can query parameter neutron_network_id in the response by calling the API (GET https://{VPC_Endpoint}/v1/{project_id}/subnets) to obtain the ID of the IPv6 subnet. Note: The IPv4 or IPv6 subnet must be in the same VPC as the subnet of the load balancer. If IP as a Backend has been enabled for the load balancer, you do not need to specify this parameter. In this case, IP as backend servers must use private IPv4 addresses, and the protocol of the backend server group must be TCP, HTTP, or HTTPS.
protocol_port	Integer	Specifies the port used by the backend server to receive requests. 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. Minimum: 1 Maximum: 65535
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, this parameter will not take effect. Minimum: 0 Maximum: 100
address	String	Specifies the private IP address bound to the backend server. If subnet_cidr_id is left blank, IP as a Backend is enabled. In this case, the IP address must be an IPv4 address. If subnet_cidr_id is not left blank, the IP address can be IPv4 or IPv6. It must be in the subnet specified by subnet_cidr_id and can only be bound to the primary NIC of the backend server.
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.
device_owner	String	Specifies whether the backend server is associated with an ECS. If this parameter is left blank, the backend server is not associated with an ECS. If the value is compute:{az_name}, the backend server is associated with an ECS. {az_name} indicates the AZ where the ECS resides. This parameter is unsupported. Please do not use it.
device_id	String	Specifies the ID of the ECS with which the backend server is associated. If this parameter is left blank, the backend server is not associated with an ECS. This parameter is unsupported. Please do not use it.
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: ONLINE: The backend server is running normally. NO_MONITOR: No health check is configured for the backend server group to which the backend server belongs. OFFLINE: The cloud server used as the backend server is stopped or does not exist.
status	Array of MemberStatus objects	Specifies the health status of the backend server if listener_id is specified.
loadbalancer_id	String	Specifies the ID of the load balancer with which the backend server is associated. This parameter is unsupported. Please do not use it.
loadbalancers	Array of ResourceID objects	Specifies the IDs of the load balancers associated with the backend server. This parameter is unsupported. Please do not use it.
created_at	String	Specifies the time when a backend server 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 a backend server 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. Values: ip: IP as backend servers instance: ECSs used as backend servers
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.

**Table 7** MemberStatus
Parameter	Type	Description
listener_id	String	Specifies the listener ID.
operating_status	String	Specifies the health status of the backend server. The value can be one of the following: ONLINE: The backend server is running normally. NO_MONITOR: No health check is configured for the backend server group to which the backend server belongs. OFFLINE: The cloud server used as the backend server is stopped or does not exist.

**Table 8** ResourceID
Parameter	Type	Description
id	String	Specifies the resource ID.

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"
}