[user@foreman rally]$ rally -vvvvv task start samples/tasks/scenarios/cinder/opnfv-cinder-single.json
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 Preparing input task
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Input task is:
{
    "CinderVolumes.create_and_attach_volume": [
        {
            "args": {
                "size": 10,
                "image": {
                    "name": "cirros_2015_03_23_10_22_57"
                },
                "flavor": {
                    "name": "m1.tiny"
                }
            },
            "runner": {
                "type": "constant",
                "times": 5,
                "concurrency": 1
            },
            "context": {
                "users": {
                    "tenants": 2,
                    "users_per_tenant": 2
                }
            }
        }
    ]
}

--------------------------------------------------------------------------------
 Task  3fdcca20-3f10-4adf-8c1d-5151011a4449: started
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Benchmarking... This can take a while...

To track task status use:

	rally task status
	or
	rally task detailed

2015-03-24 04:15:21.662 163355 INFO rally.api [-] Benchmark Task 3fdcca20-3f10-4adf-8c1d-5151011a4449 on Deployment 8bf9db04-7c22-425d-aa70-832871844da6
2015-03-24 04:15:21.662 163355 INFO rally.benchmark.engine [-] Task 3fdcca20-3f10-4adf-8c1d-5151011a4449 | Starting:  Task validation.
2015-03-24 04:15:21.669 163355 INFO rally.benchmark.engine [-] Task 3fdcca20-3f10-4adf-8c1d-5151011a4449 | Starting:  Task validation of scenarios names.
2015-03-24 04:15:21.681 163355 INFO rally.benchmark.engine [-] Task 3fdcca20-3f10-4adf-8c1d-5151011a4449 | Completed: Task validation of scenarios names.
2015-03-24 04:15:21.681 163355 INFO rally.benchmark.engine [-] Task 3fdcca20-3f10-4adf-8c1d-5151011a4449 | Starting:  Task validation of syntax.
2015-03-24 04:15:21.685 163355 INFO rally.benchmark.engine [-] Task 3fdcca20-3f10-4adf-8c1d-5151011a4449 | Completed: Task validation of syntax.
2015-03-24 04:15:21.685 163355 INFO rally.benchmark.engine [-] Task 3fdcca20-3f10-4adf-8c1d-5151011a4449 | Starting:  Task validation of semantic.
2015-03-24 04:15:21.685 163355 INFO rally.benchmark.engine [-] Task 3fdcca20-3f10-4adf-8c1d-5151011a4449 | Starting:  Task validation check cloud.
2015-03-24 04:15:21.872 163355 INFO rally.benchmark.engine [-] Task 3fdcca20-3f10-4adf-8c1d-5151011a4449 | Completed: Task validation check cloud.
2015-03-24 04:15:21.881 163355 INFO rally.benchmark.context.users [-] Task 3fdcca20-3f10-4adf-8c1d-5151011a4449 | Starting:  Enter context: `users`
2015-03-24 04:15:22.491 163355 INFO rally.benchmark.context.users [-] Task 3fdcca20-3f10-4adf-8c1d-5151011a4449 | Completed: Enter context: `users`
2015-03-24 04:15:23.100 163355 INFO rally.benchmark.context.users [-] Task 3fdcca20-3f10-4adf-8c1d-5151011a4449 | Starting:  Exit context: `users`
2015-03-24 04:15:23.725 163355 INFO rally.benchmark.context.users [-] Task 3fdcca20-3f10-4adf-8c1d-5151011a4449 | Completed: Exit context: `users`

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Task 3fdcca20-3f10-4adf-8c1d-5151011a4449: failed
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<class 'rally.exceptions.InvalidBenchmarkConfig'>
Input task is invalid!

Benchmark CinderVolumes.create_and_attach_volume[0] has wrong configuration
Benchmark configuration:
{'runner': {'type': 'constant', 'concurrency': 1, 'times': 5}, 'args': {'image': {'name': 'cirros_2015_03_23_10_22_57'}, 'flavor': {'name': 'm1.tiny'}, 'size': 10}, 'context': {'users': {'users_per_tenant': 2, 'tenants': 2}}}

Reason:
 Invalid scenario argument: 'Image '{'name': 'cirros_2015_03_23_10_22_57'}' not found'

For more details run:
rally -vd task detailed 3fdcca20-3f10-4adf-8c1d-5151011a4449
Using task: 3fdcca20-3f10-4adf-8c1d-5151011a4449