This client provides a service, such as api or mysql, and another client can find the service provider of the specified service. You can easily find the service you rely on through DNS or HTTP applications. 2. Health examination consultants can provide health examination services. This information can monitor the health of the cluster. Can be used to avoid sending traffic to unhealthy hosts. 3. storage. Applications can use consultative tiered storage. Such as dynamic configuration and service coordination. You can operate directly with HTTPAPI.