完整错误
在 logs/hadoop-root-resourcemanager-hadoop2.log 报错如下：
java.net.BindException: Port in use: hadoop102:8088
at org.apache.hadoop.http.HttpServer2.constructBindException(HttpServer2.java:1140)
at org.apache.hadoop.http.HttpServer2.bindForSinglePort(HttpServer2.java:1162)
at org.apache.hadoop.http.HttpServer2.openListeners(HttpServer2.java:1221)
at org.apache.hadoop.http.HttpServer2.start(HttpServer2.java:1076)
at org.apache.hadoop.yarn.webapp.WebApps$Builder.start(WebApps.java:408)
at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.startWepApp(ResourceManager.java:1137)
at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.serviceStart(ResourceManager.java:1245)
at org.apache.hadoop.service.AbstractService.start(AbstractService.java:194)
at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.main(ResourceManager.java:1446)
Caused by: java.net.BindException: 无法指定被请求的地址
at sun.nio.ch.Net.bind0(Native Method)
at sun.nio.ch.Net.bind(Net.java:433)
at sun.nio.ch.Net.bind(Net.java:425)
at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
at org.eclipse.jetty.server.ServerConnector.open(ServerConnector.java:317)
at org.apache.hadoop.http.HttpServer2.bindListener(HttpServer2.java:1127)
at org.apache.hadoop.http.HttpServer2.bindForSinglePort(HttpServer2.java:1158)
... 7 more
错误提示 8088 端口占用，但经过查找，没有占用该端口
原因
不在 yarn 所在的服务器上启动 yarn，就会报此错误
如：
hadoop2 部署yarn服务，但在 hadoop1 启动 yarn了