ALIYUN::SLB::VServerGroup is used to create a vServer group and attach backend servers to a Server Load Balancer (SLB) instance.

Syntax

{
  "Type": "ALIYUN::SLB::VServerGroup",
  "Properties": {
    "VServerGroupName": String,
    "BackendServers": List,
    "LoadBalancerId": String
  }
}

Properties

Property Type Required Editable Description Constraint
VServerGroupName String Yes No The name of the vServer group. None
BackendServers List No Yes The list of backend servers. You can attach a maximum of 20 Elastic Compute Service (ECS) instances.

For more information, see BackendServers properties.

LoadBalancerId String Yes No The ID of the SLB instance. None

BackendServers syntax

"BackendServers": [
  {
    "ServerId": String,
    "Port": Integer,
    "Weight": Integer,
    "Type": String,
    "Description": String,
    "ServerIp": String
  }
]

BackendServers properties

Property Type Required Editable Description Constraint
ServerId String Yes Yes The ID of the backend server. None
Port Integer Yes Yes The port that is used by the backend server. Valid values: 1 to 65535.
Weight Integer No Yes The weight of the backend server. Valid values: 0 to 100.
Type String No Yes The type of the backend server. Default value: ecs. Valid values:
  • ecs: ECS instances
  • eni: elastic network interfaces (ENIs)
Description String No Yes The description of the backend server. The description must be 1 to 80 characters in length and can contain letters, digits, hyphens (-), forward slashes (/), periods (.),and underscores (_).
ServerIp String No Yes The IP address of the backend server. The IP addresses of ECS instances or ENIs are supported.

Response parameters

Fn::GetAtt

  • VServerGroupId: the ID of the vServer group.
  • BackendServers: the list of backend servers attached to the SLB instance.

Examples

JSON format 

{
  "ROSTemplateFormatVersion": "2015-09-01",
  "Parameters": {
    "VServerGroupName": {
      "Type": "String",
      "Description": "Display name of the VServerGroup."
    },
    "LoadBalancerId": {
      "Type": "String",
      "Description": "The id of load balancer."
    },
    "BackendServers": {
      "Type": "Json",
      "Description": "The list of a combination of ECS Instance-Port-Weight.Same ecs instance with different port is allowed, but same ecs instance with same port isn't."
    }
  },
  "Resources": {
    "VServerGroup": {
      "Type": "ALIYUN::SLB::VServerGroup",
      "Properties": {
        "VServerGroupName": {
          "Ref": "VServerGroupName"
        },
        "LoadBalancerId": {
          "Ref": "LoadBalancerId"
        },
        "BackendServers": {
          "Ref": "BackendServers"
        }
      }
    }
  },
  "Outputs": {
    "VServerGroupId": {
      "Description": "The id of VServerGroup created.",
      "Value": {
        "Fn::GetAtt": [
          "VServerGroup",
          "VServerGroupId"
        ]
      }
    },
    "BackendServers": {
      "Description": "Backend server list in this VServerGroup.",
      "Value": {
        "Fn::GetAtt": [
          "VServerGroup",
          "BackendServers"
        ]
      }
    }
  }
}

YAML format 

ROSTemplateFormatVersion: '2015-09-01'
Parameters:
  VServerGroupName:
    Type: String
    Description: Display name of the VServerGroup.
  LoadBalancerId:
    Type: String
    Description: The id of load balancer.
  BackendServers:
    Type: Json
    Description: >-
      The list of a combination of ECS Instance-Port-Weight.Same ecs instance
      with different port is allowed, but same ecs instance with same port
      isn't.
Resources:
  VServerGroup:
    Type: 'ALIYUN::SLB::VServerGroup'
    Properties:
      VServerGroupName:
        Ref: VServerGroupName
      LoadBalancerId:
        Ref: LoadBalancerId
      BackendServers:
        Ref: BackendServers
Outputs:
  VServerGroupId:
    Description: The id of VServerGroup created.
    Value:
      'Fn::GetAtt':
        - VServerGroup
        - VServerGroupId
  BackendServers:
    Description: Backend server list in this VServerGroup.
    Value:
      'Fn::GetAtt':
        - VServerGroup
        - BackendServers
To view more examples, visit Listener.json and Listener.yml. In the examples, the ALIYUN::SLB::Listener, ALIYUN::SLB::LoadBalancerClone, ALIYUN::SLB::Certificate, ALIYUN::SLB::DomainExtension, ALIYUN::SLB::VServerGroup, ALIYUN::SLB::Rule, and ALIYUN::SLB::BackendServerToVServerGroupAddition resource types are involved.