# Plugin

This article mainly introduces the plugins currently supported by Sermant.

Dynamic Configuration Plugin is based on the Sermant configuration center capability. During running, the configuration can be updated to the host application. The priority of the plugin is higher than that of the environment variable configuration.

FlowControl Plugin is based on the resilience4j framework and implements non-intrusive flow control based on the "traffic" entry point. Currently, Traffic Limiting, Circuit Breaker, Bulkhead, Error Injection, and Retry are supported. In addition, rules can be dynamically configured in the configuration center and take effect in real time.

Graceful Online/Offline Plugin provides warm-up and graceful offline capabilities to solve the problem that instances that have just been launched are accessed by a large amount of traffic during initialization, resulting in request blocking, and even downtime and instance offline, due to registration discovery delays Refresh problem, unable to notify upstream in time, resulting in two problems of traffic loss or error.

Loadbalancer Plugin is based on the configuration in the configuration center, the loadbalance rules of the host application can be dynamically modified without intrusion.

Monitor Plugin can monitor the usage of hardware resources such as CPU, memory, disk IO and network IO of the server where the host application is located, as well as the usage of the host application Java virtual machine and the Druid database connection pool used by it.

Tag Router Plugin can manage the routing between services by configuring routing rules when there are multiple versions and instances of microservices, so as to achieve business purposes such as non-destructive upgrades and application dialing tests.

Registry Plugin allows microservices that have been registered with popular registration centers, such as Eureka, Nacos, ZooKeeper, and Consul, to be registered with ServiceComb (opens new window) or Nacos (opens new window) in a non-intrusive manner. It also supports Dubbo and SpringCloud frameworks.

# Compatibility List

Plugin	Microservice Framework Supported	Configuration Center Supported	Registration Center Supported
Dynamic Configuration Plugin	SpringBoot 1.5.x - 2.6.2 spring-cloud-starter-alibaba-nacos-config 1.5.0.RELEASE+ spring-cloud-starter-zookeeper-config 1.2.0.RELEASE+	servicecomb-kie ZooKeeper	N/A
FlowControl Plugin	SpringBoot 1.2.x - 2.6.x SpringWebMvc 4.1.3.RELEASE - 5.3.x Dubbo 2.6.x-2.7.x	servicecomb-kie ZooKeeper	N/A
Graceful Online/Offline Plugin	SpringBoot 1.5.x - 2.6.2 SpringCloud Edgware.SR2 - 2021.0.0	servicecomb-kie ZooKeeper	N/A
Loadbalancer Plugin	SpringBoot 1.5.x - 2.6.2 SpringCloud Edgware.SR2 - 2021.0.0	servicecomb-kie ZooKeeper	N/A
Monitor Plugin	ALL	N/A	N/A
Tag Router Plugin	SpringBoot 1.5.x - 2.6.2 SpringCloud Edgware.SR2 - 2021.0.0 Dubbo 2.6.x-2.7.x	servicecomb-kie	servicecomb-service-center
Registry Plugin	SpringBoot 1.5.x - 2.6.2 SpringCloud Edgware.SR2 - 2021.0.0 Dubbo 2.6.x-2.7.x	N/A	servicecomb-service-center
SpringBoot Registration Plugin	SpringBoot 1.5.10.Release+	servicecomb-kie ZooKeeper	Zookeeper 3.4.x+
Service visibility Plugin	SpringBoot 1.5.10+ Dubbo 2.6.x-2.7.x	ZooKeeper	N/A