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Unikernel, specializing a minimalistic libOS with an application, is an attractive design for cloud computing. However, the Achilles’ heel of unikernel is the lack of multi-process support, which makes it less flexible and applicable. Many applications rely on the process abstraction to isolate different components. For example, Apache with the multi-processing module isolates a request handler in a process to guarantee security. Prior art tackles the problem by simulating multi-process with multiple unikernels, which is incompatible with existing cloud providers and also introduces high overhead. This paper proposes Iso-UniK, a new unikernel design enabling multi-task applications with the support of both functionality and isolation. Iso-UniK leverages a recent hardware feature, named Intel Memory Protection Key (Intel MPK), to provide lightweight and efficient isolation for multi-process in unikernel. Our design has three benefits compared with previous approaches. First, Iso-UniK does not need hypervisor support and is thus compatible with existing cloud computing platforms; second, Iso-UniK promises fast system calls with only 45 cycles; last, a process can be isolated with a flexible configuration. We have implemented a prototype based on OSv, a unikernel system supporting unmodified applications. Iso-UniK can achieve fast fork operation with only 66 μs for multi-process applications. Our evaluation shows that the isolation and multi-process support in Iso-UniK will not damage the applications’ performance.

Iso-UniK: lightweight multi-process unikernel through memory protection keys