Nacos hierarchical storage model - the cluster configuration and NacosRule load balance

As our services grow,More and more service instance（比如说userservice,有8081、8082、8083Three instances of ports）,It's not safe for us to deploy all services in the same room,When dealing with emergencies,like eggs in one basket;很不安全,很不友好,All we need to deploy the computer room and the server separately;

A service can be deployed in multiple clusters,A server can deploy multiple services（但是一般不会这么做,Generally one server only deploy a service instance）,一个集群可以有多个实例;
So how do we configure the cluster?？

服务启动前,Configure the cluster properties,再进行启动：
例如：
给userservice配置集群HZ（杭州）,启动两个userservice实例：8081、8082,At this point both instances are deployed inHZ集群上


此时,Change the cluster name again,启动一个userservice3,This instance is deployed inSH（上海）集群上了

可以再NacosSee the deployed service instance in：

点击“详情”：Can see clusters and deployed instances

总结：

NacosRule负载均衡

Above we putuserservice1（服务提供者）和userservice2（服务提供者）配置在了HZ（杭州）集群,userservice3（服务提供者）配置在了SH（上海）集群.
操作：把orderservice（服务消费者）也部署在HZ集群：

此时我们的orderservice（服务消费者）also configured toHZ集群,再调用userservice（服务提供者）时,Will use the default polling algorithm;regardless of cluster（userservice1、2、3will poll calls）;

这是很不明智的,because in reality,When our service in Hangzhouorderservice（服务消费者）,To call a remote service in Shanghaiuserservice13,Certainly more than the same clusteruserservice1、2更加慢,increased time loss,舍近而求远

So how do we set theorderservice（服务消费者）What about setting default access to services on the same cluster as yourself?？
这就引出了我们的NacosRule负载均衡：
配置NacosRule负载均衡之后,Will give priority to service providers in the same cluster

注意：配置NacosRule之后,Please put the originalRibbonload balancing configuration replacement、注释或删除,不然NacosThe load balancing configuration does not take effect

在orderservice（服务消费者）配置好NacosRule负载均衡之后,It will automatically call services in the same cluster as itself,也就是userservice1和2,will not call the remote clusteruserservice3

在orderservice（服务消费者）multiple calls to the same clusteruserservice服务实例时,Random access service instance will be performed;也就是说这里的userservice1和2,会被orderservice随机访问,而3Because they are not in the same cluster,will not be given priority access.

那如果此时,同一个集群的userservice1、2服务宕机了,orderservice在调用时,When there is no service tunable in this cluster,orderservicewill call different clustersuserservice3吗？
会！但是会有警告：originally visitedHZ集群,But at this time there is a cross-cluster access,访问了SH集群的userservice3

总结：

Nacos服务实例的权重设置