# Modify Amazon EC2 Dedicated Host tenancy and affinity for an Amazon EC2 instance
<a name="moving-instances-dedicated-hosts"></a>

You can change the tenancy of an instance after you have launched it. You can also modify the affinity for your instance to target a specific host or allow it to launch on any available dedicated host with matching attributes in your account. To modify either instance tenancy or affinity, the instance must be in the `stopped` state. 

The operating system details of your instance—and whether SQL Server is installed—affect what conversions are supported. For more information about the tenancy conversion paths available to your instance, see [Tenancy conversion](https://docs.aws.amazon.com/license-manager/latest/userguide/conversion-tenancy.html) in the *License Manager User Guide*.

**Note**  
For T3 instances, you must launch the instance on a Dedicated Host to use a tenancy of `host`. For T3 instances, you can't change the tenancy from `host` to `dedicated` or `default`. Attempting to make one of these unsupported tenancy changes results in an `InvalidRequest` error code.

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#### [ Console ]

**To modify instance tenancy or affinity**

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

1. Choose **Instances**, and select the instance to modify.

1. Choose **Instance state**, **Stop**.

1. With the instance selected, choose **Actions**, **Instance settings**, **Modify instance placement**.

1. On the **Modify instance placement** page, configure the following:
   + **Tenancy**—Choose one of the following:
     + Run a dedicated hardware instance—Launches the instance as a Dedicated Instance. For more information, see [Amazon EC2 Dedicated Instances](dedicated-instance.md).
     + Launch the instance on a Dedicated Host—Launches the instance onto a Dedicated Host with configurable affinity.
   + **Affinity**—Choose one of the following:
     + This instance can run on any one of my hosts—The instance launches onto any available Dedicated Host in your account that supports its instance type.
     + This instance can only run on the selected host—The instance is only able to run on the Dedicated Host selected for **Target Host**.
   + **Target Host**—Select the Dedicated Host that the instance must run on. If no target host is listed, you might not have available, compatible Dedicated Hosts in your account.

   For more information, see [Amazon EC2 Dedicated Host auto-placement and host affinity](dedicated-hosts-understanding.md).

1. Choose **Save**.

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#### [ AWS CLI ]

**To modify instance tenancy or affinity**  
Use the [modify-instance-placement](https://docs.aws.amazon.com/cli/latest/reference/ec2/modify-instance-placement.html) command. The following example changes the specified instance's affinity from `default` to `host`, and specifies the Dedicated Host that the instance has affinity with.

```
aws ec2 modify-instance-placement \
    --instance-id i-1234567890abcdef0 \
    --affinity host \
    --tenancy host \
    --host-id h-012a3456b7890cdef
```

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#### [ PowerShell ]

**To modify instance tenancy or affinity**  
Use the [Edit-EC2InstancePlacement](https://docs.aws.amazon.com/powershell/latest/reference/items/Edit-EC2InstancePlacement.html) cmdlet. The following example changes the specified instance's affinity from `default` to `host`, and specifies the Dedicated Host that the instance has affinity with.

```
Edit-EC2InstancePlacement `
    -InstanceId i-1234567890abcdef0 `
    -Affinity host `
    -Tenancy host `
    -HostId h-012a3456b7890cdef
```

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