---
title: "TIR Auto Scaling Groups"
description: "A TIR Auto Scaling Group runs identical CPU VMs built from a snapshot of one of your VMs, and adds or removes VMs on its own between a minimum and a maximum."
content_type: "overview"
product: "tir-auto-scaling"
platform: "TIR"
url: "/tir/tir-auto-scaling/"
---

# TIR Auto Scaling Groups

A TIR Auto Scaling Group runs a set of identical VMs and changes how many of them run, so the
number of servers follows your demand. Every VM starts from one snapshot of a VM of yours, with the same
operating system, packages, and configuration. You set a **Minimum VMs** and a **Maximum VMs**, and
the group adds or removes VMs between them as demand changes.

Use it when one VM has to be big enough for your busiest hour and you pay for that hour all day.
A group adds VMs when CPU, memory, or network usage goes over your target, or at times you set,
and removes them when demand falls. It also replaces a VM that fails its health checks, so the group
keeps its size.

A group runs on CPU plans that are billed by the hour. Each VM has its own disk and its own public
IP address. For a single machine that you manage by hand, see [TIR Virtual
Machine](/tir/tir-vm/).

## Where to find it

In TIR, open your project. In the side menu, under **Compute**, select **Auto Scaling Groups**. Your
groups are listed in **Manage Auto Scaling Groups**, and **Create Auto Scaling Group** starts a new
one. Auto Scaling Groups are available in Delhi and Chennai.

## What you can do

Start with [Get started with TIR Auto Scaling Groups](/tir/tir-auto-scaling/get-started/), which
builds a small group from a snapshot, watches it add a VM, and deletes it. To see how a group
decides, read [How auto scaling works](/tir/tir-auto-scaling/concepts/how-auto-scaling-works/).

### Create

- [Create an Auto Scaling Group](/tir/tir-auto-scaling/how-to/create-an-auto-scaling-group/) from a
  snapshot, with every field of the form explained.

### Scale

- [Scale on usage](/tir/tir-auto-scaling/how-to/scale-on-usage/): add and remove VMs to keep CPU,
  memory, or network usage near a target.
- [Scale on a schedule](/tir/tir-auto-scaling/how-to/scale-on-a-schedule/): change the number of VMs
  at times you set.
- [Use Scale Now](/tir/tir-auto-scaling/how-to/use-scale-now/) to run a different number of VMs
  right away.
- [Edit an Auto Scaling Group](/tir/tir-auto-scaling/how-to/edit-an-auto-scaling-group/) to change
  its range, policy, or schedules.

### Operate

- [Set up health checks](/tir/tir-auto-scaling/how-to/set-up-health-checks/) so the group replaces a
  VM whose application stops answering.
- [Stop and start an Auto Scaling Group](/tir/tir-auto-scaling/how-to/stop-and-start-an-auto-scaling-group/).
- [Retry a failed launch](/tir/tir-auto-scaling/how-to/retry-a-failed-launch/).
- [Delete an Auto Scaling Group](/tir/tir-auto-scaling/how-to/delete-an-auto-scaling-group/).
- [Monitor an Auto Scaling Group](/tir/tir-auto-scaling/how-to/monitor-an-auto-scaling-group/): its
  state, capacity, health, and the charts of each VM.
- [View scaling activity and logs](/tir/tir-auto-scaling/how-to/view-scaling-activity-and-logs/).

### Connect

- [Manage SSH keys and security groups](/tir/tir-auto-scaling/how-to/manage-ssh-keys-and-security-groups/)
  for every VM in the group.
- [Connect a load balancer](/tir/tir-auto-scaling/how-to/connect-a-load-balancer/) so traffic
  reaches the group through one address. The load balancer itself is covered in [TIR Load
  Balancer](/tir/tir-load-balancer/).

You can also create and manage groups through [the compute operations in the TIR
API](/api/tir/compute/).

For how a group is billed, see [Billing for TIR Auto Scaling
Groups](/tir/tir-auto-scaling/concepts/billing-options/). For help with a problem, see
[Troubleshooting TIR Auto Scaling Groups](/tir/tir-auto-scaling/troubleshooting/tir-auto-scaling/),
and for short answers, the [TIR Auto Scaling Group FAQ](/tir/tir-auto-scaling/faq/).