Hadoop 启动了之后， ResourceManager未起来的问题解决

今天早上同学让我帮忙启动了下集群，首先就要启动hadoop，jps进程看了下：

2128 QuorumPeerMain
12178 Jps
8259 SecondaryNameNode
7993 NameNode

发现Hadoop的namenode和secondarynamenode都起来了，但是resourcemanager却没有起来，但是感觉配置都没有错，这个时候去查看了日志，

cd /usr/local/hadoop/logs
tail -500 yarn-hadoop-resourcemanager-hbase1.log 

发现日志中报错了，内容如下：

2018-01-16 09:10:17,735 FATAL org.apache.hadoop.yarn.server.resourcemanager.ResourceManager: Error starting ResourceManager
org.apache.hadoop.yarn.webapp.WebAppException: Error starting http server
        at org.apache.hadoop.yarn.webapp.WebApps$Builder.start(WebApps.java:278)
        at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.startWepApp(ResourceManager.java:979)
        at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.serviceStart(ResourceManager.java:1079)
        at org.apache.hadoop.service.AbstractService.start(AbstractService.java:193)
        at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.main(ResourceManager.java:1211)
Caused by: java.net.BindException: Port in use: 172.17.168.96:8088
        at org.apache.hadoop.http.HttpServer2.openListeners(HttpServer2.java:891)
        at org.apache.hadoop.http.HttpServer2.start(HttpServer2.java:827)
        at org.apache.hadoop.yarn.webapp.WebApps$Builder.start(WebApps.java:273)
        ... 4 more
Caused by: java.net.BindException: Cannot assign requested address
        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.mortbay.jetty.nio.SelectChannelConnector.open(SelectChannelConnector.java:216)
        at org.apache.hadoop.http.HttpServer2.openListeners(HttpServer2.java:886)

认真查看以下这条报错信息：

Caused by: java.net.BindException: Port in use: 172.17.168.96:8088

原来是节点的ip发生了变化，然后配置文件没有及时修改，所以才导致 r esourcemanager没有正常启动。

解决方案：

首先用ifconfig查看下自己节点的ip，然后修改yarn-site.xml中的

        
                yarn.resourcemanager.webapp.address
                172.17.174.67:8088
        

将相应的ip即可，最后重启hadoop，jps查看：

2128 QuorumPeerMain
13724 NameNode
14188 ResourceManager
18189 Jps
13997 SecondaryNameNode

hadoop启动正常，50070和8088端口都可以正常访问。

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