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Showing content from http://cloud.google.com/compute/docs/reference/rest/v1/targetPools below:

REST Resource: targetPools | Compute Engine Documentation

REST Resource: targetPools

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Resource: TargetPool

Represents a Target Pool resource.

Target pools are used with external passthrough Network Load Balancers. A target pool references member instances, an associated legacy HttpHealthCheck resource, and, optionally, a backup target pool. For more information, read Using target pools.

JSON representation
{
  "kind": string,
  "id": string,
  "creationTimestamp": string,
  "name": string,
  "description": string,
  "region": string,
  "healthChecks": [
    string
  ],
  "instances": [
    string
  ],
  "sessionAffinity": enum,
  "failoverRatio": number,
  "backupPool": string,
  "selfLink": string,
  "securityPolicy": string
}
Fields kind

string

[Output Only] Type of the resource. Always compute#targetPool for target pools.

id

string (uint64 format)

[Output Only] The unique identifier for the resource. This identifier is defined by the server.

creationTimestamp

string

[Output Only] Creation timestamp in RFC3339 text format.

name

string

Name of the resource. Provided by the client when the resource is created. The name must be 1-63 characters long, and comply with RFC1035. Specifically, the name must be 1-63 characters long and match the regular expression [a-z]([-a-z0-9]*[a-z0-9])? which means the first character must be a lowercase letter, and all following characters must be a dash, lowercase letter, or digit, except the last character, which cannot be a dash.

description

string

An optional description of this resource. Provide this property when you create the resource.

region

string

[Output Only] URL of the region where the target pool resides.

healthChecks[]

string

The URL of the HttpHealthCheck resource. A member instance in this pool is considered healthy if and only if the health checks pass. Only legacy HttpHealthChecks are supported. Only one health check may be specified.

instances[]

string

A list of resource URLs to the virtual machine instances serving this pool. They must live in zones contained in the same region as this pool.

sessionAffinity

enum

Session affinity option, must be one of the following values:
NONE: Connections from the same client IP may go to any instance in the pool.
CLIENT_IP: Connections from the same client IP will go to the same instance in the pool while that instance remains healthy.
CLIENT_IP_PROTO: Connections from the same client IP with the same IP protocol will go to the same instance in the pool while that instance remains healthy.

failoverRatio

number

This field is applicable only when the containing target pool is serving a forwarding rule as the primary pool (i.e., not as a backup pool to some other target pool). The value of the field must be in [0, 1].

If set, backupPool must also be set. They together define the fallback behavior of the primary target pool: if the ratio of the healthy instances in the primary pool is at or below this number, traffic arriving at the load-balanced IP will be directed to the backup pool.

In case where failoverRatio is not set or all the instances in the backup pool are unhealthy, the traffic will be directed back to the primary pool in the "force" mode, where traffic will be spread to the healthy instances with the best effort, or to all instances when no instance is healthy.

backupPool

string

The server-defined URL for the resource. This field is applicable only when the containing target pool is serving a forwarding rule as the primary pool, and its failoverRatio field is properly set to a value between [0, 1]. backupPool and failoverRatio together define the fallback behavior of the primary target pool: if the ratio of the healthy instances in the primary pool is at or below failoverRatio, traffic arriving at the load-balanced IP will be directed to the backup pool.

In case where failoverRatio and backupPool are not set, or all the instances in the backup pool are unhealthy, the traffic will be directed back to the primary pool in the "force" mode, where traffic will be spread to the healthy instances with the best effort, or to all instances when no instance is healthy.

selfLink

string

[Output Only] Server-defined URL for the resource.

securityPolicy

string

[Output Only] The resource URL for the security policy associated with this target pool.

Methods addHealthCheck Adds health check URLs to a target pool. addInstance Adds an instance to a target pool. aggregatedList Retrieves an aggregated list of target pools. delete Deletes the specified target pool. get Returns the specified target pool. getHealth Gets the most recent health check results for each IP for the instance that is referenced by the given target pool. insert Creates a target pool in the specified project and region using the data included in the request. list Retrieves a list of target pools available to the specified project and region. removeHealthCheck Removes health check URL from a target pool. removeInstance Removes instance URL from a target pool. setBackup Changes a backup target pool's configurations. setSecurityPolicy Sets the Google Cloud Armor security policy for the specified target pool.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-07-28 UTC.

[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-07-28 UTC."],[[["TargetPool is a resource used with external passthrough Network Load Balancers, referencing member instances, a legacy HttpHealthCheck, and optionally, a backup target pool."],["The `failoverRatio` and `backupPool` fields determine the fallback behavior of the primary target pool, directing traffic to the backup pool if the primary pool's healthy instance ratio falls below the set `failoverRatio`."],["Target pools have various properties such as `kind`, `id`, `creationTimestamp`, `name`, `description`, `region`, `healthChecks`, and `instances` which configure and identify the target pool."],["Several methods are available for managing target pools, including adding/removing health checks and instances, creating, deleting, retrieving, and setting backup pool and security policy, as well as listing target pools."],["The `sessionAffinity` setting determines how connections are distributed across instances, with options like `NONE`, `CLIENT_IP`, and `CLIENT_IP_PROTO` controlling instance selection based on client IP."]]],[]]


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