The authenticity of host ‘node01 (192.168.1.8)’ can’t be established.

详细报错： 

[root@node01 hadoop-2.7.5]# sbin/start-yarn.sh
starting yarn daemons
starting resourcemanager, logging to /export/servers/hadoop-2.7.5/logs/yarn-root-resourcemanager-node01.out
The authenticity of host 'node