org.apache.flume.FlumeException: java.net.BindException: Cannot assign requested address

org.apache.flume.FlumeException: java.net.BindException: Cannot assign requested address
	at org.apache.flume.source.NetcatSource.start(NetcatSource.java:168)
	at org.apache.flume.source.EventDrivenSourceRunner.start(EventDrivenSourceRunner.java:44)
	at org.apache.flume.lifecycle.LifecycleSupervisor$MonitorRunnable.run(LifecycleSupervisor.java:251)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
	at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)
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:444)
	at sun.nio.ch.Net.bind(Net.java:436)
	at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:214)
	at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
	at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:67)
	at org.apache.flume.source.NetcatSource.start(NetcatSource.java:162)
	... 9 more

这个异常很明显说明flume根据配置文件中配置的ip地址，向此ip上绑定端口时不能解析此ip地址，有如下几种原因导致

1.ip地址配置格式不正确。

2.此ip地址所在的主机存在网络故障。

3.ciip地址所在的主机没有正常开启。

修改flume配置文件中的：a1.sources.r1.bind =node8（node8我在hosts文件中做了域名映射），根据自己主机的配置不同进行相应的修改。