部署ELK时候，logstash启动报错

Sending logstash logs to /var/log/logstash.log.
Exception in thread ">output" org.elasticsearch.discovery.MasterNotDiscoveredException: waited for [30s]
    at org.elasticsearch.action.support.master.TransportMasterNodeOperationAction$3.onTimeout(org/elasticsearch/action/support/master/TransportMasterNodeOperationAction.java:180)
    at org.elasticsearch.cluster.service.InternalClusterService$NotifyTimeout.run(org/elasticsearch/cluster/service/InternalClusterService.java:492)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(java/util/concurrent/ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(java/util/concurrent/ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(java/lang/Thread.java:722)

检查EA配置，发现系修改了Cluster名字所致，修改Logstash Output属性：

　　 elasticsearch {
    　　host => "127.0.0.1"
   　　 port => 9300
   　　 cluster => "us-elasticsearch"
 　　 }

增加cluster属性，重启即可！

logstash启动报错 Exception in thread ">output" org.elasticsearch.discovery.MasterNotDiscoveredException: waited for [30s]