Nacos
持久化：conf/application.properties 的 ### Count of DB: 处配置数据库信息
本地单机（非集群）运行：bin/startup.cmd 中配置 set MODE="standalone"
- 不配置会报错：
Caused by: com.alibaba.nacos.api.exception.NacosException: java.net.UnknownHostException: jmenv.tbsite.net
auth和system启动报错
https://gitee.com/y_project/RuoYi-Cloud/issues/I1O1NJ
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APPLICATION FAILED TO START
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Description:
Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.
Reason: Failed to determine a suitable driver class
Action:
Consider the following:
If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.
If you have database settings to be loaded from a particular profile you may need to activate it (the profiles local are currently active).
Disconnected from the target VM, address: '127.0.0.1:5979', transport: 'socket'
Process finished with exit code 1