Updating a Backend Server

Function

This API is used to update a backend server. You can modify its name and weight. You can set a larger weight for backend servers that can receive more traffic.

Constraints

If the provisioning status of the associated load balancer is not ACTIVE, the backend server cannot be updated.

URI

PUT /v2/{project_id}/elb/pools/{pool_id}/members/{member_id}

**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.
member_id	Yes	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. You can obtain this value by calling the API described in Querying Backend Servers.

Request

**Table 2** Parameter description
Parameter	Mandatory	Type	Description
member	Yes	Object	Specifies the backend server. For details, see Table 3.

**Table 3** **member** parameter description
Parameter	Mandatory	Type	Description
name	No	String	Specifies the backend server name. The value contains a maximum of 255 characters.
admin_state_up	No	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	No	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.

Response

**Table 4** Parameter description
Parameter	Type	Description
member	Object	Specifies the backend server. For details, see Table 5.

**Table 5** **member** 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: Updating the name and weight of a backend server

PUT https://{Endpoint}/v2/145483a5107745e9b3d80f956713e6a3/elb/pools/5a9a3e9e-d1aa-448e-af37-a70171f2a332/members/c0042496-e220-44f6-914b-e6ca33bab503 

{ 
    "member": { 
        "name": "member create test", 
        "weight": 10
    } 
}

Example Response

Example response

{
    "member": {
        "name": "member-jy-tt-1", 
        "weight": 1, 
        "admin_state_up": true, 
        "subnet_id": "33d8b01a-bbe6-41f4-bc45-78a1d284d503", 
        "tenant_id": "145483a5107745e9b3d80f956713e6a3",
        "address": "192.168.44.11", 
        "protocol_port": 88, 
        "operating_status": "ONLINE", 
        "id": "c0042496-e220-44f6-914b-e6ca33bab503"
    }
}