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.

Calling Method

For details, see Calling APIs.

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 it, see Obtaining a Project ID.

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 instance 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

OK

  • 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.