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. It is an ID automatically generated for the backend server that is 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	Member 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. This parameter is reserved, and the default value is true.
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	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 server. It is the ID automatically generated for the backend server 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.
project_id	String	Specifies the ID of the project to which the backend server belongs. This parameter has the same meaning as tenant_id.
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 resides. 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. This parameter is reserved. The value can be true or false. true: Enabled false: Disabled
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 backend server is running normally. NO_MONITOR: No health check is configured for the backend server group that the backend server belongs to. OFFLINE: The cloud server used as the backend server is stopped or does not exist.

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",
        "project_id": "145483a5107745e9b3d80f956713e6a3",
        "address": "192.168.44.11", 
        "protocol_port": 88, 
        "operating_status": "ONLINE", 
        "id": "c0042496-e220-44f6-914b-e6ca33bab503"
    }
}