# Modify supported instance types for an existing Amazon EC2 Dedicated Host
<a name="modify-host-support"></a>

You can modify a Dedicated Host to change the instance types that it supports. If it currently supports a single instance type, you can modify it to support multiple instance types within that instance family. Similarly, if it currently supports multiple instance types, you can modify it to support a specific instance type only.

To modify a Dedicated Host to support multiple instance types, you must first stop all running instances on the host. The modification takes approximately 10 minutes to complete. The Dedicated Host transitions to the `pending` state while the modification is in progress. You can't start stopped instances or launch new instances on the Dedicated Host while it is in the `pending` state.

To modify a Dedicated Host that supports multiple instance types to support only a single instance type, the host must either have no running instances, or the running instances must be of the instance type that you want the host to support. For example, to modify a host that supports multiple instance types in the `m5` instance family to support only `m5.large` instances, the Dedicated Host must either have no running instances, or it must have only `m5.large` instances running on it.

If you allocate a host for a virtualized instance type, you can't modify the instance type to a `.metal` instance type after the host is allocated. For example, if you allocate a host for the `m5.large` instance type, you can't modify the instance type to `m5.metal`. Similarly, if you allocate a host for a `.metal` instance type, you can't modify the instance type to a virtualized instance type after the host is allocated. For example, if you allocate a host for the `m5.metal` instance type, you can't modify the instance type to `m5.large`.

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#### [ Console ]

**To modify the supported instance types for a Dedicated Host**

1. Open the Amazon EC2 console at [https://console.aws.amazon.com/ec2/](https://console.aws.amazon.com/ec2/).

1. In the Navigation pane, choose **Dedicated Host**.

1. Select the Dedicated Host to modify and choose **Actions**, **Modify host**.

1. Do one of the following, depending on the current configuration of the Dedicated Host:
   + If the Dedicated Host currently supports a specific instance type, **Support multiple instance types** is not enabled, and **Instance type** lists the supported instance type. To modify the host to support multiple types in the current instance family, for **Support multiple instance types**, choose **Enable**.

     You must first stop all instances running on the host before modifying it to support multiple instance types.
   + If the Dedicated Host currently supports multiple instance types in an instance family, **Enabled** is selected for **Support multiple instance types**. To modify the host to support a specific instance type, for **Support multiple instance types**, clear **Enable**, and then for **Instance type**, select the specific instance type to support.

     You can't change the instance family supported by the Dedicated Host.

1. Choose **Save**.

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#### [ AWS CLI ]

**To modify the supported instance types for a Dedicated Host**  
Use the [modify-hosts](https://docs.aws.amazon.com/cli/latest/reference/ec2/modify-hosts.html) command.

The following example modifies a Dedicated Host to support multiple instance types within the `m5` instance family.

```
aws ec2 modify-hosts \
    --instance-family m5 \
    --host-ids h-012a3456b7890cdef
```

The following example modifies a Dedicated Host to support `m5.xlarge` instances only.

```
aws ec2 modify-hosts \
    --instance-type m5.xlarge \
    --instance-family --host-ids h-012a3456b7890cdef
```

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#### [ PowerShell ]

**To modify the supported instance types for a Dedicated Host**  
Use the [Edit-EC2Host](https://docs.aws.amazon.com/powershell/latest/reference/items/Edit-EC2Host.html) cmdlet.

The following example modifies a Dedicated Host to support multiple instance types within the `m5` instance family.

```
Edit-EC2Host `
    -InstanceFamily m5 `
    -HostId h-012a3456b7890cdef
```

The following example modifies a Dedicated Host to support `m5.xlarge` instances only.

```
Edit-EC2Host `
    -InstanceType m5.xlarge `
    -HostId h-012a3456b7890cdef
```

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