MockFog: Emulating Fog Computing Infrastructure in the Cloud

Fog computing is an emerging computing paradigm that uses processing and storage capabilities located at the edge, in the cloud, and possibly in between. Testing fog applications, however, is hard since runtime infrastructures will typically be in use or may not exist, yet. In this paper, we propose an approach that emulates such infrastructures in the cloud. Developers can freely design emulated fog infrastructures, configure their performance characteristics, and inject failures at runtime to evaluate their application in various deployments and failure scenarios. We also present our proof-of-concept implementation MockFog and show that application performance is comparable when running on MockFog or a small fog infrastructure testbed.