问题安装完hadoop后无法连接dfs

安装好namenode和datanode后，

1）格式化hdfs成功

namenode -format：格式化Hdfs文件系统

2）启动所有hadoop成功

如果启动datanode不成功，一般是因为防火墙原因，关闭防火墙即可

3）但是查看hdfs 

hadoop dfsadmin -report ：查看报告

显示连接失败

15/06/16 11:02:39 INFO ipc.Client: Retrying connect to server: /172.16.80.150:9000. Already tried 0 time(s).
15/06/16 11:02:40 INFO ipc.Client: Retrying connect to server: /172.16.80.150:9000. Already tried 1 time(s).
15/06/16 11:02:41 INFO ipc.Client: Retrying connect to server: /172.16.80.150:9000. Already tried 2 time(s).
15/06/16 11:02:42 INFO ipc.Client: Retrying connect to server: /172.16.80.150:9000. Already tried 3 time(s).
15/06/16 11:02:43 INFO ipc.Client: Retrying connect to server: /172.16.80.150:9000. Already tried 4 time(s).
15/06/16 11:02:44 INFO ipc.Client: Retrying connect to server: /172.16.80.150:9000. Already tried 5 time(s).
15/06/16 11:02:45 INFO ipc.Client: Retrying connect to server: /172.16.80.150:9000. Already tried 6 time(s).
15/06/16 11:02:46 INFO ipc.Client: Retrying connect to server: /172.16.80.150:9000. Already tried 7 time(s).
15/06/16 11:02:47 INFO ipc.Client: Retrying connect to server: /172.16.80.150:9000. Already tried 8 time(s).
15/06/16 11:02:48 INFO ipc.Client: Retrying connect to server: /172.16.80.150:9000. Already tried 9 time(s).
Bad connection to DFS... command aborted.

搞了几遍发现问题是：标红部分之前写的是ip，然后死活就是连接不上hdfs，改成localhost后连接成功，再检查，发现配置里写的ip用的是映射ip，不是本机ip，晕死，粗心大意的毛病不能再犯。大家以后配ip的时候记得至少看 一下ifconfig的地址吧

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>


<!-- Put site-specific property overrides in this file. -->


<configuration>
   <property>
      <name>fs.default.name</name>
      <value>hdfs://localhost:9000</value>//你的namenode的配置，机器名加端口    
      <description>The name of the default file system. Either the literal string "local" or a host:port for DFS.</description>
   </property>


</configuration>