hadoop大佬进来看看。。。。。。。求助解答！

Question

[root@hadoop1 sbin]# start-dfs.sh
17/12/01 22:08:31 WARN hdfs.DFSUtil: Namenode for null remains unresolved for ID null. Check your hdfs-site.xml file to ensure namenodes are configured properly.
Starting namenodes on [hadoop01]
hadoop01: ssh: Could not resolve hostname hadoop01: Temporary failure in name resolution
hadoop启动老是报这个，不知道为啥？求解？

Answer 1

在虚拟机里可以，而用shh老是出现报上面的错