Start Nacos console

Nacos GitHub official address: https://github.com/alibaba/nacos

• Download the package from the address and extract it to a local directory
• cd into the bin directory and run startup.cmd -m standalone
• Access the console address, default username and password nacos

Console address: http://localhost:8848/nacos

Register service with Nacos

• Add the spring-cloud-alibaba management dependency in the parent project

	<dependency>
       <groupId>com.alibaba.cloud</groupId>
       <artifactId>spring-cloud-alibaba-dependencies</artifactId>
       <version>2.2.5.RELEASE</version>
       <type>pom</type>
       <scope>import</scope>
   </dependency>

• Add the Nacos client dependency in the child module

	<dependency>
           <groupId>com.alibaba.cloud</groupId>
           <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
       </dependency>

• Modify the configuraton file

spring:
 cloud:
   nacos:
     server-addr: localhost:8848

Nacos service classification storage model

• Set the instance cluster attribute

spring:
 cloud:
   nacos:
     server-addr: localhost:8848
     discovery:
       cluster-name: HZ  # Cluster name

NacosRule load balancing

• Configuration file method

userservice:   # Microservice name to configure
 ribbon:
   NFLoadBalancerRuleClassName: com.alibaba.cloud.nacos.ribbon.NacosRule

NacosRule prioritizes instances in the same cluster, then uses random load balancing after determining the instance list.

• Code method: Define a new IRule:

	@Bean
   public IRule nacosRule(){
       return new NacosRule();
   }

• Nacos console can also set instance weights

Environment isolation ---- namespace

• Create a new namespace in the Nacos console
• Modify the configuratoin file

spring: 
 cloud:
   nacos:
     server-addr: localhost:8848
     discovery:
       cluster-name: SH  # Cluster name
       namespace: 16035e26-9a58-403c-9308-083325c0f8ee  # Namespace

Group ---- group

spring:
 cloud:
   nacos:
     server-addr: localhost:8848
     discovery:
       cluster-name: SH  # Cluster name
       namespace: 16035e26-9a58-403c-9308-083325c0f8ee  # Namespace
       group: xiaoyuxia  # Group

Services with different namespace or group cannot communicate with each other.

Ephemeral instance

spring:
 cloud:
   nacos:
     server-addr: localhost:8848
     discovery:
       cluster-name: SH   # Cluster name
       namespace: 16035e26-9a58-403c-9308-083325c0f8ee  # Namespace
       ephemeral: false  # Whether it is an ephemeral instance