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 /v2.0/lbaas/pools/{pool_id}/members/{member_id}

Table 1 Parameter description

Parameter

Mandatory

Type

Description

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 server. It is the ID automatically generated for the backend server 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.

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 Response parameters

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 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.

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.

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}/v2.0/lbaas/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"
        }
    }
    

Status Code

For details, see Status Codes.