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Software-Defined Network (SDN) has been widely employed in data center networks to host various software systems such as microservice systems. A microservice system is constructed by a microservice architecture composed of dozens of services running in different lightweight virtual machines (e.g., containers) and relying on overlay networks for connectivity. However, with the increase of the system scale and the network traffic volume, the network becomes more complex and common to behave anomalously. Therefore, it is error-prone to manually investigate anomalies. To tackle this problem, we propose a non-intrusive monitoring system to help network operators obtain deep insights from the network traffic generated by the running system. Based on the monitoring system, we propose an anomaly detection method to automatically detect network anomalies. The core idea is to learn behavior patterns of …