Querying Backend Servers

Function

This API is used to query backend servers in a specific backend server group. Filter query and pagination query are supported. Unless otherwise specified, exact match is applied.

URI

GET /v2/{project_id}/elb/pools/{pool_id}/members

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

Request

**Table 2** Parameter description
Parameter	Mandatory	Type	Description
marker	No	String	Specifies the ID of the backend server from which pagination query starts, that is, the ID of the last backend server on the previous page. If this parameter is not specified, the first page will be queried. This parameter must be used together with limit.
limit	No	Integer	Specifies the number of backend servers on each page. If this parameter is not set, all backend servers are queried by default.
page_reverse	No	Boolean	Specifies the page direction. The value can be true or false, and the default value is false. The last page in the list requested with page_reverse set to false will not contain the "next" link, and the last page in the list requested with page_reverse set to true will not contain the "previous" link. This parameter must be used with limit.
id	No	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.
tenant_id	No	String	Specifies the ID of the project where the backend server is used. The value contains a maximum of 255 characters.
name	No	String	Specifies the backend server name. The value contains a maximum of 255 characters.
address	No	String	Specifies the private IP address of the backend server. The value contains a maximum of 64 characters.
protocol_port	No	Integer	Specifies the port used by the backend server.
subnet_id	No	String	Specifies the ID of the subnet where the backend server works.
admin_state_up	No	Boolean	Specifies the administrative status of the backend server. The value can be true or false. NOTE: This parameter can be used during creation and update and its actual value depends on whether the backend server exists. If the backend server exists, the value is true. Otherwise, the value is false.
weight	No	Integer	Specifies the backend server weight.

Response

**Table 3** Parameter description
Parameter	Type	Description
members	Array	Lists backend servers in the backend server group. For details, see Table 4.

**Table 4** **members** parameter description
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.
tenant_id	String	Specifies the ID of the project where the backend server is used. The value contains a maximum of 255 characters.
name	String	Specifies the backend server name. The value contains a maximum of 255 characters.
address	String	Specifies the private IP address of the backend server. This IP address must be in the subnet specified by subnet_id. This parameter can be set only to the IP address of the primary NIC, for example, 192.168.3.11. The value contains a maximum of 64 characters.
protocol_port	Integer	Specifies the port used by the backend server. The port number ranges from 1 to 65535.
subnet_id	String	Specifies the ID of the subnet where the backend server works. The private IP address of the backend server is in this subnet. IPv6 subnets are not supported.
admin_state_up	Boolean	Specifies the administrative status of the backend server. The value can be true or false. Currently, the value can only be true. NOTE: This parameter can be used during creation and update and its actual value depends on whether the backend server exists. If the backend server exists, the value is true. Otherwise, the value is false.
weight	Integer	Specifies the backend server weight. The value ranges from 0 to 100. If the value is 0, the backend server will not accept new requests. The default value is 1.
operating_status	String	Specifies the health check result of the backend server. The value can be one of the following: ONLINE: The health check is successfully conducted and the backend server is running properly. OFFLINE: The health check is abnormal and the backend server is running improperly. The load balancer stops distributing traffic to this server until it recovers. NO_MONITOR: No health check is conducted. No health checks are configured, or the value of admin_state_up is false. The value contains a maximum of 16 characters.

Example Request

Example request 1: Querying all backend servers

GET https://{Endpoint}/v2/1a3e005cf9ce40308c900bcb08e5320c/elb/pools/5a9a3e9e-d1aa-448e-af37-a70171f2a332/members

Example request 2: Querying the backend cloud server whose IP address is 10.0.0.8 and port number is 80

GET https://{Endpoint}/v2/1a3e005cf9ce40308c900bcb08e5320c/elb/pools/5a9a3e9e-d1aa-448e-af37-a70171f2a332/members?address=10.0.0.8&protocol_port=80

Example Response

Example response 1

{
    "members": [
        {
            "address": "10.0.0.8", 
            "admin_state_up": true, 
            "id": "9a7aff27-fd41-4ec1-ba4c-3eb92c629313", 
            "protocol_port": 80, 
            "subnet_id": "013d3059-87a4-45a5-91e9-d721068ae0b2", 
            "tenant_id": "1a3e005cf9ce40308c900bcb08e5320c",
            "weight": 1, 
            "operating_status": "ONLINE", 
            "name": "member-name"
        }
    ]
}

Example response 2

{
    "members": [
        {
            "address": "10.0.0.8", 
            "admin_state_up": true, 
            "id": "9a7aff27-fd41-4ec1-ba4c-3eb92c629313", 
            "protocol_port": 80, 
            "subnet_id": "013d3059-87a4-45a5-91e9-d721068ae0b2", 
            "tenant_id": "1a3e005cf9ce40308c900bcb08e5320c",
  
            "weight": 1, 
            "operating_status": "ONLINE", 
            "name": "member-name"
        }
    ]
}