启动hadoop报192.168.1.151: Address 192.168.1.151 maps to node1, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT!

使用root用户启动hadoop的时候报错：

[root@node1 ~]# su - hadoop -c start-all.sh
starting namenode, logging to /app/hadoop/bin/../logs/hadoop-hadoop-namenode-node1.out
192.168.1.153: starting datanode, logging to /app/hadoop/bin/../logs/hadoop-hadoop-datanode-node3.out
192.168.1.152: starting datanode, logging to /app/hadoop/bin/../logs/hadoop-hadoop-datanode-node2.out
192.168.1.151: Address 192.168.1.151 maps to node1, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT!
192.168.1.151: starting secondarynamenode, logging to /app/hadoop/bin/../logs/hadoop-hadoop-secondarynamenode-node1.out
starting jobtracker, logging to /app/hadoop/bin/../logs/hadoop-hadoop-jobtracker-node1.out
192.168.1.152: starting tasktracker, logging to /app/hadoop/bin/../logs/hadoop-hadoop-tasktracker-node2.out
192.168.1.153: starting tasktracker, logging to /app/hadoop/bin/../logs/hadoop-hadoop-tasktracker-node3.out

解决方法：修改本机ssh_config文件

[root@node1 ~]# cat /etc/ssh/ssh_config 
GSSAPIAuthentication yse
----改为：----
GSSAPIAuthentication no

据说GSSAPIAuthentication的作用：是否允许使用基于GSSAPI的用户认证。