在ssh做无密码的时候出现每次都输入密码的问题：
此时百度，发现可以查看日志文件vi /var/log/secure，
发现里面的如下错误：
Apr  6 10:06:49 gslave2 sshd[1770]: Received signal 15; terminating.
Apr  6 10:06:49 gslave2 sshd[12663]: Server listening on 0.0.0.0 port 22.
Apr  6 10:06:49 gslave2 sshd[12663]: Server listening on :: port 22.
Apr  6 10:07:00 gslave2 sshd[12673]: Authentication refused: bad ownership or modes for directory /root
Apr  6 10:07:00 gslave2 sshd[12673]: Authentication refused: bad ownership or modes for directory /root
Apr  6 10:07:00 gslave2 sshd[12673]: Authentication refused: bad ownership or modes for directory /root
Apr  6 10:07:00 gslave2 sshd[12673]: Authentication refused: bad ownership or modes for directory /root
Apr  6 10:07:01 gslave2 sshd[12675]: Connection closed by 192.168.1.251
Apr  6 10:07:09 gslave2 sshd[12676]: Authentication refused: bad ownership or modes for directory /root
Apr  6 10:07:09 gslave2 sshd[12676]: Authentication refused: bad ownership or modes for directory /root
Apr  6 10:07:09 gslave2 sshd[12676]: Authentication refused: bad ownership or modes for directory /root
Apr  6 10:07:09 gslave2 sshd[12676]: Authentication refused: bad ownership or modes for directory /root
Apr  6 10:07:24 gslave2 sshd[12678]: Connection closed by 192.168.1.251
Apr  6 10:14:47 gslave2 sshd[12754]: Authentication refused: bad ownership or modes for directory /root
Apr  6 10:14:47 gslave2 sshd[12754]: Authentication refused: bad ownership or modes for directory /root
Apr  6 10:14:47 gslave2 sshd[12754]: Authentication refused: bad ownership or modes for directory /root
Apr  6 10:14:47 gslave2 sshd[12754]: Authentication refused: bad ownership or modes for directory /root
Apr  6 10:14:51 gslave2 sshd[12754]: Accepted password for root from 192.168.1.251 port 33515 ssh2
Apr  6 10:14:51 gslave2 sshd[12754]: pam_unix(sshd:session): session opened for user root by (uid=0)
Apr  6 10:14:51 gslave2 sshd[12754]: Received disconnect from 192.168.1.251: 11: disconnected by user
Apr  6 10:14:51 gslave2 sshd[12754]: pam_unix(sshd:session): session closed for user root
Apr  6 10:14:53 gslave2 sshd[12771]: Authentication refused: bad ownership or modes for directory /root
Apr  6 10:14:53 gslave2 sshd[12771]: Authentication refused: bad ownership or modes for directory /root
Apr  6 10:14:53 gslave2 sshd[12771]: Authentication refused: bad ownership or modes for directory /root
Apr  6 10:14:53 gslave2 sshd[12771]: Authentication refused: bad ownership or modes for directory /root
Apr  6 10:14:56 gslave2 sshd[12771]: Accepted password for root from 192.168.1.251 port 33516 ssh2
Apr  6 10:14:56 gslave2 sshd[12771]: pam_unix(sshd:session): session opened for user root by (uid=0)
Apr  6 10:14:56 gslave2 sshd[12771]: Received disconnect from 192.168.1.251: 11: disconnected by user
Apr  6 10:14:56 gslave2 sshd[12771]: pam_unix(sshd:session): session closed for user root


发现root用户的/root目录应该是550权限，否则会引起很多问题，这个问题同样是由于这个原因
原来在之前修改过/root目录的权限
最终，执行chmod 550 root后解决

此时百度时，有文章提到可以查看/var/log/secure日志

通过查看serverB机器/var/log/secure，发现报错如下

此时百度时，有文章提到可以查看/var/log/secure日志

通过查看serverB机器/var/log/secure，发现报错如下

此时百度时，有文章提到可以查看/var/log/secure日志

通过查看serverB机器/var/log/secure，发现报错如下

此时百度时，有文章提到可以查看/var/log/secure日志

通过查看serverB机器/var/log/secure，发现报错如下