# Amazon EC2: Attach or detach Amazon EBS volumes to EC2 instances based on tags
<a name="reference_policies_examples_ec2_ebs-owner"></a>

This example shows how you might create an identity-based policy that allows EBS volume owners to attach or detach their EBS volumes defined using the tag `VolumeUser` to EC2 instances that are tagged as development instances (`Department=Development`). This policy grants the permissions necessary to complete this action programmatically from the AWS API or AWS CLI. To use this policy, replace the *italicized placeholder text* in the example policy with your own information. Then, follow the directions in [create a policy](access_policies_create.md) or [edit a policy](access_policies_manage-edit.md).

For more information about creating IAM policies to control access to Amazon EC2 resources, see [Controlling Access to Amazon EC2 Resources](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/UsingIAM.html) in the *Amazon EC2 User Guide*.

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#### [ JSON ]

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```
{
    "Version":"2012-10-17",		 	 	 
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "ec2:AttachVolume",
                "ec2:DetachVolume"
            ],
            "Resource": "arn:aws:ec2:*:*:instance/*",
            "Condition": {
                "StringEquals": {"aws:ResourceTag/Department": "Development"}
            }
        },
        {
            "Effect": "Allow",
            "Action": [
                "ec2:AttachVolume",
                "ec2:DetachVolume"
            ],
            "Resource": "arn:aws:ec2:*:*:volume/*",
            "Condition": {
                "StringEquals": {"aws:ResourceTag/VolumeUser": "${aws:username}"}
            }
        }
    ]
}
```

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