ULB.Pool

Element Description

For ECS groups under a shared load balancer, one listener corresponds to multiple ECS groups. You can add or delete ECS groups as required. An ECS group consists of multiple ECSs.

Element Properties

**Table 1** Property Description
Property	Mandatory	Descripiton
sessionPersistence	No	Session persistence setting Type: ULB.StickySession Value Description: If this option is selected, the session persistence function is enabled by default. Default: {u'type': u'SOURCE_IP'} Suggestion: Set the value based on the live environment.
protocol	Yes	ECS group protocol Type: string Value Description: The options are HTTP and TCP. Value Constraint: The value must be consistent with the listener protocol. Suggestion: Set the value based on the live environment.
name	No	ECS group name Type: string Value Description: Customize the value. Value Constraint: The value supports a maximum of 64 characters and can only contain digits, letters, underscores (_), and hyphens (-). Suggestion: Customize the value.
lbAlgorithm	Yes	Allocation policy type Type: string Value Description: ROUND_ROBIN: indicates the weighted round robin algorithm. LEAST_CONNECTIONS: indicates the weighted least connection. SOURCE_IP: indicates the source IP algorithm. Default: ROUND_ROBIN Value Constraint: The options are ROUND_ROBIN, LEAST_CONNECTIONS, and SOURCE_IP. Suggestion: Set the value based on the live environment.
listenerId	Yes	ID of the belonged listener Type: string Value Description: ID generated after a ULB instance is created, for example, 8abbd7a9-c1f8-440d-96ff-376ee7382082. Value Constraint: The ID must be the listener ID of an existing ULB instance. Suggestion: You are advised to drag the object to the ULB.Listener and use the get_reference function to automatically generate the value. Alternatively, obtain the ULB listener ID on the ULB console and enter it accordingly.

Relationships Between Elements

**Table 2** Relationship description
Description	Target
Inclusion	ULB.Listener

Return Value

Property	Type	Description
refID	string	ECS group instance ID

Blueprint Example

tosca_definitions_version: cloud_tosca_version_1_0
inputs:
  pool_protocol:
     description: ECS group protocol, which must be consistent with the listener protocol 
  pool_listenerId:
     description: Belonged listener ID 
  pool_lbAlgorithm:
     description: Allocation policy type 
node_templates:
  pool:
    type: Cloud.ULB.Pool
    properties:
      protocol:
        get_input: pool_protocol
      listenerId:
        get_input: pool_listenerId
      lbAlgorithm:
        get_input: pool_lbAlgorithm

Parent topic: List of Elements

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