nova/doc/v3/api_samples/os-security-groups/server-post-resp.json

{
    "server": {
        "admin_pass": "ki8cbWeZdxH6",
        "id": "2dabdd93-ced7-4607-a542-2516de84e0e5",
        "links": [
            {
                "href": "http://openstack.example.com/v3/servers/2dabdd93-ced7-4607-a542-2516de84e0e5",
                "rel": "self"
            },
            {
                "href": "http://openstack.example.com/servers/2dabdd93-ced7-4607-a542-2516de84e0e5",
                "rel": "bookmark"
            }
        ],
        "security_groups": [
            {
                "name": "test"
            }
        ]
    }
}