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Basic scenarios for creating managed instance groups (MIGs) | Compute Engine Documentation

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A managed instance group (MIG) is a group of virtual machine (VM) instances that you treat as a single entity. Each VM in a MIG is based on an instance template.

If you only need to create multiple VMs, but don't want them grouped together in a MIG, see the bulk instance API.

To learn about other Compute Engine options, see Choose a Compute Engine deployment strategy for your workload.

To get started with creating a MIG, read this document to find a basic configuration that works for you.

MIGs have many configuration options. See the following guides to quickly get a MIG up and running for various scenarios:

MIGs have different limitations depending on which features you use. The following lists show general MIG limitations as well as additional limitations if you use regional or stateful features.

• By default, you can create up to 1,000 VMs in a zonal MIG. If you need more, use one of the following options:

  • Increase the size limit of your MIG.
  • Create a regional MIG, which allows twice as many VMs as a zonal MIG.
  • Create multiple MIGs and split your workload across them.
  • Contact support to make a request.

• When updating a MIG, you can specify up to 1,000 VMs in a single request.

• Once the MIG is created, you cannot change its networks or subnetworks. All VMs in the MIG are assigned to the same subnetworks.

• Shared VPC on interfaces other than nic0 for managed instance groups is supported in gcloud CLI and the API, but not in Google Cloud console.

A MIG that is spread across multiple zones—a regional MIG—has the following limitations:

• By default, you can create up to 2,000 VMs. If you need more, increase the size limit of your MIG or contact support.
• You must select which zones are associated with a regional MIG when you create the MIG. After you choose specific zones during creation, you cannot change or update the zones later. But you can set the MIG's target distribution shape to specify how the group distributes its managed instances across the zones that you selected.

• If you set the group's target distribution shape to BALANCED, ANY, or ANY_SINGLE_ZONE, review the target distribution shape limitations.

• If you want to autoscale a regional MIG, you must set the group's target distribution shape to BALANCED or EVEN.

Load balancing with a regional MIG doesn't support the max-rate target capacity in RATE and UTILIZATION balancing modes. To learn more about the usage guidelines for each load balancer, see Balancing modes and target capacity settings.

A MIG with stateful configuration—a stateful MIG—has the following limitations:

• You cannot use autoscaling if your MIG has stateful configuration.
• If you want to use automated rolling updates, you must set the replacement method to RECREATE.
• For stateful regional MIGs, you must disable proactive redistribution (set the redistribution type to NONE) to prevent deletion of stateful instances by automatic cross-zone redistribution.
• If you use an all-instances configuration to override instance template properties, you cannot specify those properties in any per-instance configuration and at the same time in the group's all-instances configuration.

If you want to configure an autoscaler for your MIG, review the autoscaler specifications, too.

If you want your MIG to include VM instances that use IPv6 addressing, you must use the dual-stack setting when you create your instance template. MIGs don't support IPv6-only instances.

For more information, see Create an instance template with IPv6 addresses.

After you've created a MIG, you might want to do the following:

• View info about your MIG and its managed VM instances
• Learn what a managed instance is and how to work with managed instances

• Add or remove VMs from the group

  • Automatically resize a MIG based on increases or decreases in load by configuring an autoscaler
  • Manually set the size of a MIG
  • Disable creation retries mode during resize
  • Create instances with specific names in a MIG
  • Delete specific instances from a group
  • Abandon instances from a group

• Increase the group's size limit

• Delete the group

• Change the instance template for the group

• Apply configuration updates to the VMs in a MIG

  • Automatically apply configuration updates to VMs in a MIG
  • Selectively apply configuration updates to specific VMs

  • Understand the instanceTemplate and versions fields

  • Recreate instances in the group

  • Canary test a new instance template in a MIG

• Learn how to add stateful configuration in order to preserve disks, IP addresses, and metadata when VMs are recreated

• Set up an application-based health check to automatically recreate VMs if your application does not respond as expected
• Set up a load balancer to distribute user traffic across multiple instances of your application

Try a tutorial:

• Use autohealing for highly available applications
• Use load balancing for highly available applications
• Use autoscaling for highly scalable applications
• Migrate an existing workload to a stateful managed 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 2025-08-07 UTC.

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