Nacos 的注册与配置集成(Spring Cloud Alibaba)

  Nacos 里 orders 的实例数 1;字段:ip=<本机局域网IP> port==应用端口 True ephemeral=True weight=1.0 healthy=True enabled=True clusterName=DEFAULT
  实例的 metadata 键:['preserved.register.source'];metadata 里 preserved.register.source = SPRING_CLOUD
  另一个服务通过 DiscoveryClient.getInstances("orders") 看到:[<本机局域网IP>:9602 metadata键=[nacos.cluster, nacos.ephemeral, nacos.healthy, nacos.instanceId, nacos.weight, preserved.register.source]]

  SIGTERM(正常停机):0.6 秒后实例从 Nacos 里消失
  SIGKILL(进程被杀,没机会注销):0.6 秒后实例从 Nacos 里消失

  往 Nacos 发布 orders.properties:{"code":0,"message":"success","data":true}
  引入了 nacos-config 的 starter 但没有写 spring.config.import(默认检查打开):应用启动失败,提示 No spring.config.import property has been defined / Action: / Add a spring.config.import=nacos: property to your configuration. / If configuration is not required add spring.config.import=optional:nacos: instead. / To disable this check, set spring.cloud.nacos.config.import-check.enabled=false.
  关掉检查(import-check.enabled=false)且没有 spring.config.import:greeting=local-greeting,local.only=yes,shared.key=null;app.msg:@RefreshScope=local-msg,普通单例=local-msg,@ConfigurationProperties=local-msg
  spring.config.import=optional:nacos:orders.properties:greeting=nacos-greeting,local.only=yes,shared.key=from-nacos;app.msg:@RefreshScope=nacos-v1,普通单例=nacos-v1,@ConfigurationProperties=nacos-v1

  改之前:greeting=nacos-greeting,local.only=yes,shared.key=from-nacos;app.msg:@RefreshScope=nacos-v1,普通单例=nacos-v1,@ConfigurationProperties=nacos-v1
  发布新内容后 0.1 秒看到变化:greeting=nacos-greeting,local.only=yes,shared.key=from-nacos;app.msg:@RefreshScope=nacos-v2,普通单例=nacos-v1,@ConfigurationProperties=nacos-v2

  同一个 dataId 在 group=TEAM_B 里发布 greeting=team-b-greeting:{"code":0,"message":"success","data":true}
  默认 group 的客户端:greeting=nacos-greeting,local.only=yes,shared.key=from-nacos;app.msg:@RefreshScope=nacos-v2,普通单例=nacos-v2,@ConfigurationProperties=nacos-v2
  spring.config.import=optional:nacos:orders.properties?group=TEAM_B:greeting=team-b-greeting,local.only=yes,shared.key=null;app.msg:@RefreshScope=team-b,普通单例=team-b,@ConfigurationProperties=team-b