{
   "NovaServers.boot_and_rebuild_server": [
        {
            "args": {
                "flavor": {
                    "name": "m1.nano"
                },
                "from_image": {
                    "name": "cirros-0.3.1-x86_64-uec"
                },
                "to_image": {
                    "name": "cirros-0.3.2-x86_64-uec"
                }
            },
            "runner": {
                "type": "constant",
                "times": 5,
                "concurrency": 2
            },
            "context": {
                "users": {
                    "tenants": 1,
                    "users_per_tenant": 1
                }
            }
        }
    ]
}