# 添加后端云服务器
#### 调试
您可以在[API Explorer](https://apiexplorer.developer.huaweicloud.com/apiexplorer/doc?product=ELB&api=CreateMember&version=v2)中直接运行调试该接口。
#### 接口格式
| 方法   | URI                                 | 说明                    |
|:---|:---|:---|
| POST | /v2.0/lbaas/pools/{pool_id}/members | 添加属于某个后端云服务器组的后端云服务器。 |
   
#### 接口约束
- 属于一个pool的两个member不能有相同的address和port。
- 创建member时指定的子网必须和VIP所在子网处在同一个VPC下。
- admin_state_up参数必须是true。
 
#### 具体步骤
1. 设置请求消息头。Postman中设置好头部信息，将获取到的Token放入头部，如下图： 
   图1设置请求消息头-添加后端云服务器组   
   ![](https://support.huaweicloud.com/api-elb/zh-cn_image_0135706234.png)
   
   
   
2. 在Body标签中填写请求消息体。
   
   图2填写请求消息体-添加后端云服务器组   
   ![](https://support.huaweicloud.com/api-elb/zh-cn_image_0135706240.png)
   
   
3. 查询虚拟机的subnet_id和主网卡IP。
   
   填写URL。
   ```
   GET https://{VPCEndpoint}/v2.0/ports?device_id={ecs_id}
   ```
   在响应体中获取primary_interface为true的port的subnet_id和ip_address。响应体示例如下：
   ```
   {
       "ports": [
           {
               "id": "4813697b-62ba-4f4b-90e5-13bbbdec7198",
               "name": "",
               "status": "ACTIVE",
               "admin_state_up": true,
               "fixed_ips": [
                   {
                       "subnet_id": "d97b6b89-6aa2-4636-a86b-132eb4eb566e",
                       "ip_address": "10.1.1.89"
                   }
               ],
               "mac_address": "fa:16:3e:cb:8d:0a",
               "network_id": "1b76b9c2-9b7e-4ced-81bd-d13f7389d7c9",
               "tenant_id": "04dd36f978800fe22f9bc00bea090736",
               "project_id": "04dd36f978800fe22f9bc00bea090736",
               "device_id": "f738c464-b5c2-45df-86c0-7f436620cd54",
               "device_owner": "compute:cn-north-4a",
               "security_groups": [
                   "7a233393-5be2-4dff-8360-1558dd950f6e"
               ],
               "extra_dhcp_opts": [],
               "allowed_address_pairs": [],
               "binding:vnic_type": "normal",
               "binding:vif_details": {},
               "binding:profile": {},
               "port_security_enabled": true,
               "created_at": "2019-11-19T09:28:38",
               "updated_at": "2019-11-19T09:28:39"
           },
           {
               "id": "94971c39-46f0-443a-85e8-31cb7497c78e",
               "name": "",
               "status": "ACTIVE",
               "admin_state_up": true,
               "fixed_ips": [
                   {
                       "subnet_id": "8d944cda-1f29-4035-9681-ad8c5117fbc5",
                       "ip_address": "192.168.0.11"
                   }
               ],
               "mac_address": "fa:16:3e:5c:d2:57",
               "network_id": "1b76b9c2-9b7e-4ced-81bd-d13f7389d7c9",
               "tenant_id": "04dd36f978800fe22f9bc00bea090736",
               "project_id": "04dd36f978800fe22f9bc00bea090736",
               "device_id": "f738c464-b5c2-45df-86c0-7f436620cd54",
               "device_owner": "compute:cn-north-4a",
               "security_groups": [
                   "a10dfc31-0055-4b84-b36e-1291b918125c",
                   "7a233393-5be2-4dff-8360-1558dd950f6e"
               ],
               "extra_dhcp_opts": [],
               "allowed_address_pairs": [],
               "binding:vnic_type": "normal",
               "binding:vif_details": {
                   "primary_interface": true
               },
               "binding:profile": {},
               "port_security_enabled": true,
               "created_at": "2019-11-12T17:17:51",
               "updated_at": "2019-11-12T17:17:51"
           }
       ]
   }
   ```
   
   
4. 填写URL。 
   ```
   https://{ELBEndpoint}/v2.0/lbaas/pools/{pool_id}/members
   ```
   
   
5. 发送请求。body体中的subnet_id和address为[步骤3]中获取的值，选择请求方法为POST，点击Send按钮，得到服务端响应。
   
   ```
   {
       "member": {
           "name": "member4j",
           "weight": 1,
           "admin_state_up": false,
           "subnet_id": "8d944cda-1f29-4035-9681-ad8c5117fbc5",
           "tenant_id": "0d0bf0e8fb564cc9abbe526dbdca9248",
           "address": "192.168.0.11",
           "protocol_port": 8080,
           "id": "97f18d73-e97d-434c-8cb7-3274a83dda73",
           "operating_status": "ONLINE"
       }
   }
   ```
   
   
 
#### 示例代码
[2]中消息体内容
```
{
    "member": {
        "subnet_id": "8d944cda-1f29-4035-9681-ad8c5117fbc5",
        "protocol_port": "8080",
        "name": "member4j",
        "address": "192.168.0.11"
    }
}
```