1. 引入 Spring Cloud Sentinel，后续做进一步集成

2. 重新搭建 Elasticsearch 服务，并接入 search 服务

promotion/promotion-service-impl/src/main/resources/config/application.yaml

@@ -2,7 +2,7 @@ spring:
   # datasource
   datasource:
     type: com.alibaba.druid.pool.DruidDataSource
-    url: jdbc:mysql://180.167.213.26:13306/mall_promotion?useSSL=false&useUnicode=true&characterEncoding=UTF-8
+    url: jdbc:mysql://s1.iocoder.cn:3306/mall_promotion?useSSL=false&useUnicode=true&characterEncoding=UTF-8
     driver-class-name: com.mysql.jdbc.Driver
     username: root
     password: ${MALL_MYSQL_PASSWORD}