利用脚本自动建立ssh无密码登陆，系统版本为centos6.5

tailf /var/log/secure

Mar 18 15:35:05 a2 sshd[6521]: Authentication refused: bad ownership or modes for directory /root

Mar 18 15:35:05 a2 sshd[6521]: Authentication refused: bad ownership or modes for directory /root

解决方法：

chmod 0750 /root -R

or chown root.root root