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Showing content from https://cloud.google.com/compute/docs/reference/rest/v1/instanceGroups below:

REST Resource: instanceGroups | Compute Engine Documentation

REST Resource: instanceGroups

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Resource: InstanceGroup

Represents an Instance Group resource.

Instance Groups can be used to configure a target for load balancing.

Instance groups can either be managed or unmanaged.

To create managed instance groups, use the instanceGroupManager or regionInstanceGroupManager resource instead.

Use zonal unmanaged instance groups if you need to apply load balancing to groups of heterogeneous instances or if you need to manage the instances yourself. You cannot create regional unmanaged instance groups.

For more information, read Instance groups.

JSON representation
{
  "kind": string,
  "id": string,
  "creationTimestamp": string,
  "name": string,
  "description": string,
  "namedPorts": [
    {
      "name": string,
      "port": integer
    }
  ],
  "network": string,
  "fingerprint": string,
  "zone": string,
  "selfLink": string,
  "size": integer,
  "region": string,
  "subnetwork": string
}
Fields kind

string

[Output Only] The resource type, which is always compute#instanceGroup for instance groups.

id

string (uint64 format)

[Output Only] A unique identifier for this instance group, generated by the server.

creationTimestamp

string

[Output Only] The creation timestamp for this instance group in RFC3339 text format.

name

string

The name of the instance group. The name must be 1-63 characters long, and comply with RFC1035.

description

string

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

namedPorts[]

object

Optional. Assigns a name to a port number. For example: {name: "http", port: 80}

This allows the system to reference ports by the assigned name instead of a port number. Named ports can also contain multiple ports. For example: [{name: "app1", port: 8080}, {name: "app1", port: 8081}, {name: "app2", port: 8082}]

Named ports apply to all instances in this instance group.

namedPorts[].name

string

The name for this named port. The name must be 1-63 characters long, and comply with RFC1035.

namedPorts[].port

integer

The port number, which can be a value between 1 and 65535.

network

string

[Output Only] The URL of the network to which all instances in the instance group belong. If your instance has multiple network interfaces, then the network and subnetwork fields only refer to the network and subnet used by your primary interface (nic0).

fingerprint

string (bytes format)

[Output Only] The fingerprint of the named ports. The system uses this fingerprint to detect conflicts when multiple users change the named ports concurrently.

A base64-encoded string.

zone

string

[Output Only] The URL of the zone where the instance group is located (for zonal resources).

selfLink

string

[Output Only] The URL for this instance group. The server generates this URL.

size

integer

[Output Only] The total number of instances in the instance group.

region

string

[Output Only] The URL of the region where the instance group is located (for regional resources).

subnetwork

string

[Output Only] The URL of the subnetwork to which all instances in the instance group belong. If your instance has multiple network interfaces, then the network and subnetwork fields only refer to the network and subnet used by your primary interface (nic0).

Methods addInstances Adds a list of instances to the specified instance group. aggregatedList Retrieves the list of instance groups and sorts them by zone. delete Deletes the specified instance group. get Returns the specified zonal instance group. insert Creates an instance group in the specified project using the parameters that are included in the request. list Retrieves the list of zonal instance group resources contained within the specified zone. listInstances Lists the instances in the specified instance group. removeInstances Removes one or more instances from the specified instance group, but does not delete those instances. setNamedPorts Sets the named ports for the specified instance group.

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."],[[["Instance Groups are used to configure targets for load balancing and can be either managed or unmanaged."],["Managed instance groups should be created using the `instanceGroupManager` or `regionInstanceGroupManager` resource instead of Instance Groups."],["Unmanaged instance groups are used for load balancing heterogeneous instances or when manual instance management is needed, and are only available in zonal format."],["The JSON representation provides fields such as `kind`, `id`, `creationTimestamp`, `name`, and `namedPorts` to describe the instance group, while its output fields describe the `zone`, `region`, `selfLink`, and more."],["Instance Group methods include adding or removing instances, listing, deleting, and getting specific groups, and setting named ports."]]],[]]


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