To list resources that AWS Config has discovered

The following command lists the EC2 instances that AWS Config has discovered:

aws configservice list-discovered-resources --resource-type AWS::EC2::Instance

Output:

{
    "resourceIdentifiers": [
        {
            "resourceType": "AWS::EC2::Instance",
            "resourceId": "i-1a2b3c4d"
        },
        {
            "resourceType": "AWS::EC2::Instance",
            "resourceId": "i-2a2b3c4d"
        },
        {
            "resourceType": "AWS::EC2::Instance",
            "resourceId": "i-3a2b3c4d"
        }
    ]
}