场景

Nacos简介、下载与配置持久化到Mysql：

https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/109356152

在下载Nacos的zip包之后，双击bin下的startup.cmd之后提示:

org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:157)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:540)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142)
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775)
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:316)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248)
        at com.alibaba.nacos.Nacos.main(Nacos.java:35)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:109)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:58)
        at org.springframework.boot.loader.PropertiesLauncher.main(PropertiesLauncher.java:466)
Caused by: org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
        at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:125)
        at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:86)
        at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:414)
        at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:174)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:181)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:154)
        ... 16 common frames omitted

报错图片如下

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实现

这是因为这里Nacos没有配置集群模式，而是使用的单机模式，所以编辑startup.cmd,

将MODE修改为standalone

默认MODE的值是"cluster"

所以在走下面的逻辑时会走集群模式的逻辑

if %MODE% == "standalone" (
    echo "nacos is starting with standalone"
   set"NACOS_OPTS=-Dnacos.standalone=true"
    set "NACOS_JVM_OPTS=-Xms512m -Xmx512m -Xmn256m"
)

rem if nacos startup mode is cluster
if %MODE% == "cluster" (
    echo "nacos is starting with cluster"
   if %EMBEDDED_STORAGE% == "embedded" (
       set"NACOS_OPTS=-DembeddedStorage=true"
   )

    set "NACOS_JVM_OPTS=-server -Xms2g -Xmx2g -Xmn1g -XX:MetaspaceSize=128m -XX:MaxMetaspaceSize=320m -XX:-OmitStackTraceInFastThrow -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=%BASE_DIR%\logs\java_heapdump.hprof -XX:-UseLargePages"
)

编辑之后，双击startup.cmd