* 注：版本：Nacos 2.x 不一定全是這個問題，只是有可能
錯誤信息：無具體錯誤堆棧信息，只是不讀取配置中心的配置(nacos所有配置都正確無誤)，這里以數據庫配置從配置中心讀取為例
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled. 2022-02-18 21:06:21 [main] ERROR o.s.b.diagnostics.LoggingFailureAnalysisReporter - *************************** APPLICATION FAILED TO START *************************** 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 develop are currently active). 2022-02-18 21:06:21 [Thread-2] WARN com.alibaba.nacos.common.http.HttpClientBeanHolder - [HttpClientBeanHolder] Start destroying common HttpClient 2022-02-18 21:06:21 [Thread-7] WARN com.alibaba.nacos.common.notify.NotifyCenter - [NotifyCenter] Start destroying Publisher 2022-02-18 21:06:21 [Thread-7] WARN com.alibaba.nacos.common.notify.NotifyCenter - [NotifyCenter] Destruction of the end 2022-02-18 21:06:21 [Thread-2] WARN com.alibaba.nacos.common.http.HttpClientBeanHolder - [HttpClientBeanHolder] Destruction of the end
錯誤原因：Nacos 2.0 版本新增了gRPC的通信方式，需要再開放兩個端口，若nacos端口為8848，還需開放的端口為：【9848、9849】
官網地址：Nacos 2.0.0 兼容性文檔
解決方案：開放這兩個新增的端口