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.out192.168.1.153: starting datanode, loggingto/app/hadoop/bin/../logs/hadoop-hadoop-datanode-node3.out192.168.1.152: starting datanode, loggingto/app/hadoop/bin/../logs/hadoop-hadoop-datanode-node2.out192.168.1.151: Address192.168.1.151mapstonode1, but this doesnotmap backtothe address-POSSIBLEBREAK-IN ATTEMPT!192.168.1.151: starting secondarynamenode, loggingto/app/hadoop/bin/../logs/hadoop-hadoop-secondarynamenode-node1.out
starting jobtracker, logging to/app/hadoop/bin/../logs/hadoop-hadoop-jobtracker-node1.out192.168.1.152: starting tasktracker, loggingto/app/hadoop/bin/../logs/hadoop-hadoop-tasktracker-node2.out192.168.1.153: starting tasktracker, loggingto/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。
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/2730/viewspace-3151584/ ，如需转载，请注明出处，否则将追究法律责任。
