# `Imds` section
<a name="Imds-cluster-v3"></a>

**(Optional)** Specifies the global instance metadata service (IMDS) configuration.

```
Imds:
  ImdsSupport: {{string}}
```

## `Imds` properties
<a name="Imds-cluster-v3.properties"></a>

`ImdsSupport` (**Optional**, `String`)  
Specifies which IMDS versions are supported in the cluster nodes. Supported values are `v1.0` and `v2.0`. The default value is `v2.0`.  
If `ImdsSupport` is set to `v1.0`, both IMDSv1 and IMDSv2 are supported.  
If `ImdsSupport` is set to `v2.0`, only IMDSv2 is supported.  
For more information, see [Use IMDSv2](https://docs.amazonaws.cn/AWSEC2/latest/UserGuide/configuring-instance-metadata-service.html) in the *Amazon EC2 User Guide for Linux instances*.  
[Update policy: If this setting is changed, the update is not allowed.](using-pcluster-update-cluster-v3.md#update-policy-fail-v3)  
Starting with Amazon ParallelCluster 3.7.0, the `ImdsSupport` default value is `v2.0`. We recommend that you set `ImdsSupport` to `v2.0` and replace IMDSv1 with IMDSv2 in your custom actions calls.  
Support for [`Imds`](#Imds-cluster-v3) / [`ImdsSupport`](#yaml-cluster-Imds-ImdsSupport) is added with Amazon ParallelCluster version 3.3.0.