This paper presents an extensible framework for testing the behavior of networked machines running the Linux operating system in the presence of faults. The framework allows injecting a variety of faults, such as faults in the computing core or peripheral devices of a machine or faults in the network connecting the machines. The system under test as well as the fault- and workload run on this system are configurable. The core of the framework is a User Mode Linux, which runs on top of a real world Linux machine as a single process and simulates a single machine. A second process paired with each virtual machine is used for fault injection.
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