# Auto-scale virtual machines in Azure

WEKA provides a resize API to scale up or down the cluster. You must use only this API to resize the cluster. Do not use any other option for resizing.

{% hint style="info" %}
The cluster name prefix, resource group name, and Azure subscription id appear in the `Resize cluster` section of the [Cluster help commands](/planning-and-installation/weka-installation-on-azure/deployment-on-azure-using-terraform.md#cluster-help-commands) output.
{% endhint %}

**Procedure:**

1. Get the resize API (function-app).\
   Run the command:

```
function_key=$(az functionapp keys list --name <cluster name prefix>-function-app --resource-group <resource group name> --subscription <Azure subscription id> --query functionKeys -o tsv)

```

2. Resize the cluster.\
   Enter the value of the required number of virtual machines instead of `ENTER_NEW_VALUE_HERE` (the minimum value is `6`), and run the command:

```
curl --fail https://<cluster name prefix>-function-app.azurewebsites.net/api/resize?code=$function_key -H "Content-Type:application/json" -d '{"value":ENTER_NEW_VALUE_HERE}'

```

3. Track the resize progress using the commands provided in the [Check the deployment progress](/planning-and-installation/weka-installation-on-azure/deployment-on-azure-using-terraform.md#check-the-deployment-progress) section.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.weka.io/planning-and-installation/weka-installation-on-azure/auto-scale-virtual-machines-in-azure.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.