Containerized microservices have become popular for building systems using simple, lightweight, loosely coupled services. Due to replacing the monolithic application with multiple microservices, inner function calls become inter-microservice communications, which increases the network pressure. However, the networking of containerized microservice built on the kernel that is inefficient. In this paper, we propose DockNet, a high-performance userspace networking solution for containerized microservices. We (1) leverage DPDK and customized LwIP as the high-performance data plane and TCP/IP stack, respectively. (2) introduce a master-slave threading model to decouple execution and management. (3) adopt namespace mechanism to control the access of microservices to data planes and employ timer-based rate limiters to achieve performance isolation. (4) construct fast channels between partner microservices to improve network performance further. In our various experiments, DockNet shows over 4.2x,4.3x, 5.5x of higher performance compared with existing networking solutions - kernel bridge, Open vSwitch and SR-IOV, respectively.
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