Help Center> API Gateway> API Reference (ME-Abu Dhabi Region)> Dedicated Gateway APIs (V2)> VPC Channel Management> Updating Backend Instances

Updated on 2023-05-09 GMT+08:00

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Updating Backend Instances

Function

This API is used to update the backend instances of a specified VPC channel. During the update, the request parameters overwrite the backend instances of the corresponding cloud server group. If no cloud server group is specified, all cloud server groups are overwritten.

URI

PUT /v2/{project_id}/apigw/instances/{instance_id}/vpc-channels/{vpc_channel_id}/members

**Table 1** Path Parameters
Parameter	Mandatory	Type	Description
project_id	Yes	String	Project ID. For details about how to obtain a project ID, see "Appendix" > "Obtaining a Project ID" in this document.
instance_id	Yes	String	Gateway ID, which can be obtained from the gateway information on the APIG console.
vpc_channel_id	Yes	String	VPC channel ID.

Request Parameters

**Table 2** Request header parameters
Parameter	Mandatory	Type	Description
X-Auth-Token	Yes	String	User token. It can be obtained by calling the IAM API used to obtain a user token. The value of X-Subject-Token in the response header is a token.

**Table 3** Request body parameters
Parameter	Mandatory	Type	Description
members	No	Array of MemberInfo objects	Backend instances.
member_group_name	No	String	Backend server group to be modified. If this parameter is not specified, all backends defined by members for the VPC channel are modified. If this parameter is specified, only the backend instances in the backend server group defined by members are modified. Input parameters of other backend server groups are ignored. For example, if member_group_name=primary is passed, only backend instances of backend server group 105c6902457144a4820dff8b1ad63331 in members are modified.

**Table 4** MemberInfo
Parameter	Mandatory	Type	Description
host	No	String	Backend server address. This parameter is required when the member type is IP address. Maximum: 64
weight	No	Integer	Weight. The higher the weight is, the more requests a backend service will receive. Minimum: 0 Maximum: 10000
is_backup	No	Boolean	Indicates whether the backend service is a standby node. After you enable this function, the backend service serves as a standby node. It works only when all non-standby nodes are faulty. This function is supported only when your gateway has been upgraded to the corresponding version. If your gateway does not support this function, contact technical support. Default: false
member_group_name	No	String	Backend server group name. The server group facilitates backend service address modification.
status	No	Integer	Backend server status. 1: available 2: unavailable Enumeration values: 1 2
port	No	Integer	Backend server port. Minimum: 0 Maximum: 65535
ecs_id	No	String	Backend server ID. This parameter is required if the backend instance type is ecs. The value can contain 1 to 64 characters, including letters, digits, hyphens (-), and underscores (_). Maximum: 255
ecs_name	No	String	Backend server name. This parameter is required if the backend instance type is ecs. The value can contain 1 to 64 characters, including letters, digits, hyphens (-), underscores (_), and periods (.). Maximum: 64

Response Parameters

Status code: 200

**Table 5** Response body parameters
Parameter	Type	Description
size	Integer	Length of the returned resource list.
total	Long	Number of resources that match the query conditions.
members	Array of VpcMemberInfo objects	Cloud server list.

**Table 6** VpcMemberInfo
Parameter	Type	Description
host	String	Backend server address. This parameter is required when the member type is IP address. Maximum: 64
weight	Integer	Weight. The higher the weight is, the more requests a backend service will receive. Minimum: 0 Maximum: 10000
is_backup	Boolean	Indicates whether the backend service is a standby node. After you enable this function, the backend service serves as a standby node. It works only when all non-standby nodes are faulty. This function is supported only when your gateway has been upgraded to the corresponding version. If your gateway does not support this function, contact technical support. Default: false
member_group_name	String	Backend server group name. The server group facilitates backend service address modification.
status	Integer	Backend server status. 1: available 2: unavailable Enumeration values: 1 2
port	Integer	Backend server port. Minimum: 0 Maximum: 65535
ecs_id	String	Backend server ID. This parameter is required if the backend instance type is ecs. The value can contain 1 to 64 characters, including letters, digits, hyphens (-), and underscores (_). Maximum: 255
ecs_name	String	Backend server name. This parameter is required if the backend instance type is ecs. The value can contain 1 to 64 characters, including letters, digits, hyphens (-), underscores (_), and periods (.). Maximum: 64
id	String	Backend server ID.
vpc_channel_id	String	VPC channel ID.
create_time	String	Time when the backend server is added to the VPC channel.
member_group_id	String	Backend server group ID.

Status code: 400

**Table 7** Response body parameters
Parameter	Type	Description
error_code	String	Error code.
error_msg	String	Error message.

Status code: 401

**Table 8** Response body parameters
Parameter	Type	Description
error_code	String	Error code.
error_msg	String	Error message.

Status code: 403

**Table 9** Response body parameters
Parameter	Type	Description
error_code	String	Error code.
error_msg	String	Error message.

Status code: 404

**Table 10** Response body parameters
Parameter	Type	Description
error_code	String	Error code.
error_msg	String	Error message.

Status code: 500

**Table 11** Response body parameters
Parameter	Type	Description
error_code	String	Error code.
error_msg	String	Error message.

Example Requests

Updating non-standby backend instances of a VPC channel

{
  "member_group_name" : "primary",
  "members" : [ {
    "host" : "192.168.2.25",
    "weight" : 1,
    "is_backup" : false,
    "member_group_name" : "primary"
  } ]
}

Updating all backend instances of a VPC channel

{
  "members" : [ {
    "ecs_id" : "1082720c-3c15-409c-9ae3-4983ddfb6a9d",
    "ecs_name" : "APIGtest02",
    "weight" : 2
  } ]
}

Example Responses

Status code: 200

Example 1

{
  "total" : 1,
  "size" : 1,
  "members" : [ {
    "host" : "192.168.2.25",
    "weight" : 1,
    "is_backup" : false,
    "member_group_name" : "primary",
    "port" : 22,
    "status" : 1,
    "ecs_id" : "192.168.2.25",
    "ecs_name" : "192.168.2.25",
    "id" : "683b6807cad54122a6777ad047a6178e",
    "vpc_channel_id" : "56a7d7358e1b42459c9d730d65b14e59",
    "create_time" : "2020-07-23T09:13:24Z",
    "member_group_id" : "631b551cddda40478ef720163a9412ed"
  } ]
}

Example 2

{
  "total" : 1,
  "size" : 1,
  "members" : [ {
    "host" : "192.168.0.17",
    "weight" : 2,
    "is_backup" : false,
    "member_group_name" : "primary",
    "port" : 22,
    "status" : 1,
    "ecs_id" : "1082720c-3c15-409c-9ae3-4983ddfb6a9d",
    "ecs_name" : "APIGtest02",
    "id" : "5c868f0224084710a1e188b7d3057c52",
    "vpc_channel_id" : "105c6902457144a4820dff8b1ad63331",
    "create_time" : "2020-07-23T09:03:53Z",
    "member_group_id" : "631b551cddda40478ef720163a9412ed"
  } ]
}

Status code: 400

Bad Request

{
  "error_code" : "APIG.2001",
  "error_msg" : "The request parameters must be specified, parameter name:members"
}

Status code: 401

Unauthorized

{
  "error_code" : "APIG.1002",
  "error_msg" : "Incorrect token or token resolution failed"
}

Status code: 403

Forbidden

{
  "error_code" : "APIG.1005",
  "error_msg" : "No permissions to request this method"
}

Status code: 404

Not Found

{
  "error_code" : "APIG.3023",
  "error_msg" : "The VPC channel does not exist,id:56a7d7358e1b42459c9d730d65b14e59"
}

Status code: 500

Internal Server Error

{
  "error_code" : "APIG.9999",
  "error_msg" : "System error"
}

Status Codes

Status Code	Description
200	OK
400	Bad Request
401	Unauthorized
403	Forbidden
404	Not Found
500	Internal Server Error

Error Codes

See Error Codes.

Parent topic: VPC Channel Management

Previous topic: Querying Backend Servers of a VPC Channel

Next topic: Removing a Backend Server

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