虚拟机免密钥，在NameNode上生成公钥，分发给DataNode
#生成公钥 ssh-keygen -t dsa -P " -f ~/.ssh/id_dsa cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys #分发到各台DataNode机器上 scp ~/.ssh/id_dsa.pub node07:`pwd`/node07.pub #DataNode上执行 cat ~/.ssh/node07.pub >> ~/.ssh/authorized_keys
原文：https://www.cnblogs.com/linyaoguo/p/11641102.html