---
title: "POST /projects/{project}/regions/{region}/instanceGroupManagers/{instanceGroupManager}/resize"
method: POST
path: "/projects/{project}/regions/{region}/instanceGroupManagers/{instanceGroupManager}/resize"
tags: ["regionInstanceGroupManagers"]
---

# POST /projects/{project}/regions/{region}/instanceGroupManagers/{instanceGroupManager}/resize

`POST /projects/{project}/regions/{region}/instanceGroupManagers/{instanceGroupManager}/resize`

Changes the intended size of the managed instance group. If you increase
the size, the group creates new instances using the current instance
template. If you decrease the size, the group deletes one or more
instances.

The resize operation is marked DONE if theresize request is successful. The underlying actions take
additional time. You must separately verify the status of thecreating or deleting actions with thelistmanagedinstances
method.

If the group is part of a backend
service that has enabled
connection draining, it can take up to 60 seconds after the connection
draining duration has elapsed before the VM instance is removed or deleted.

## Path parameters

- `project` string, required
- `region` string, required
- `instanceGroupManager` string, required

## Query parameters

- `size` integer, required
- `requestId` string

## Response `200`

Successful response

---

[API](https://skmtc.dev/google/apis/compute.md) · [All operations](https://skmtc.dev/google/apis/compute/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/google/compute/revisions/6120ed8969d4/schema)