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Brown Dog VM elasticity project needs to support multiple OSes, so OpenStack seems a viable high level solution. Currently considering using OpenStack. May consider using Docker on the VMs if needed.
- Design Goal
To support auto-scaling of the system resources to adapt to the load of external requests to the Brown Dog Data Tiling Service. In general, this includes Medici, MongoDB, RabbitMQ, and the extractors, currently the design focuses only on auto-scaling the extractors. Specifically, the system needs to start or use more extractors when certain criterion is met, such as the number of outstanding requests exceed certain thresholds, and suspend or stop extractors when other criteria are met. The intention of scaling down part is mainly to save resources (CPU, memory, etc.) for other purposes.