servera機器已經生產rsa金鑰
且已經將public key新增到serverb機器/root/.ssh/authorized_keys
但是ssh [email protected]機器時仍然需要輸入密碼，即無密碼認證失敗
分析與處理：
用ssh -v debug訪問，日誌如下，但是從日誌看不到失敗原因，只知道在用publickey認證時，對端沒有reply;
通過檢視serverb機器/var/log/secure，發現報錯如下
jan 8 13:31:34 wng-141 sshd[32366]: authentication refused: bad ownership or modes for directory /root
jan 8 13:31:34 wng-141 sshd[32367]: connection closed by 135.251.218.231
發現所有使用者的home目錄應該是700許可權，否則會引起很多問題，這個問題同樣是由於這個原因
（3）修改許可權（需要修改~/.ssh資料夾和authorized_keys檔案的，不然會報不允許的錯誤或者無法出現know_hosts檔案）
chmod 700 ~/.ssh
chmod 700 ~/.ssh/authorized_keys
700~/
.ssh
chmod
700~/
.ssh
/authorized_keys
最終，執行chmod 700 root後解決
feb 9 11:02:52 centoshostnamekl1 su: pam_unix(su:session): session opened for user root by wangshumin(uid=500)
feb 10 17:40:16 centoshostnamekl1 su: pam_unix(su:session): session closed for user root
feb 10 17:40:16 centoshostnamekl1 su: pam_unix(su:session): session closed for user root
feb 10 17:40:16 centoshostnamekl1 su: pam_unix(su:session): session closed for user root
feb 10 17:50:06 centoshostnamekl1 sudo: wangshumin : tty=pts/2 ; pwd=/home/wangshumin/zookeeper/zookeeper-3.4.5/bin ; user=root ; command=/usr/bin/vim /etc/profile
feb 10 19:29:01 centoshostnamekl1 sshd[30650]: authentication refused: bad ownership or modes for directory /home/wangshumin
feb 10 19:35:16 centoshostnamekl1 sshd[31014]: authentication refused: bad ownership or modes for directory /home/wangshumin
feb 10 19:35:26 centoshostnamekl1 sshd[31014]: failed password for wangshumin from 192.168.72.101 port 46370 ssh2
feb 10 19:35:26 centoshostnamekl1 sshd[31014]: failed password for wangshumin from 192.168.72.101 port 46370 ssh2
feb 10 19:35:26 centoshostnamekl1 sshd[31015]: connection closed by 192.168.72.101
feb 10 19:42:24 centoshostnamekl1 sshd[31223]: authentication refused: bad ownership or modes for directory /home/wangshumin
feb 10 19:42:38 centoshostnamekl1 sshd[31223]: failed password for wangshumin from 192.168.72.101 port 46399 ssh2
feb 10 19:42:38 centoshostnamekl1 sshd[31223]: failed password for wangshumin from 192.168.72.101 port 46399 ssh2
feb 10 19:42:38 centoshostnamekl1 sshd[31224]: connection closed by 192.168.72.101
feb 10 19:43:54 centoshostnamekl1 sshd[31260]: authentication refused: bad ownership or modes for directory /home/wangshumin
feb 10 19:43:58 centoshostnamekl1 sshd[31260]: accepted password for wangshumin from 192.168.72.101 port 46406 ssh2
feb 10 19:43:58 centoshostnamekl1 sshd[31260]: pam_unix(sshd:session): session opened for user wangshumin by (uid=0)
feb 10 19:43:58 centoshostnamekl1 sshd[31265]: received disconnect from 192.168.72.101: 11: disconnected by user
feb 10 19:43:58 centoshostnamekl1 sshd[31260]: pam_unix(sshd:session): session closed for user wangshumin
feb 10 19:45:00 centoshostnamekl1 sshd[31439]: authentication refused: bad ownership or modes for directory /home/wangshumin
feb 10 19:45:06 centoshostnamekl1 sshd[31439]: failed password for wangshumin from 192.168.72.101 port 46414 ssh2
feb 10 19:45:06 centoshostnamekl1 sshd[31439]: failed password for wangshumin from 192.168.72.101 port 46414 ssh2
feb 10 19:45:06 centoshostnamekl1 sshd[31440]: connection closed by 192.168.72.101
feb 10 19:48:38 centoshostnamekl1 sshd[31967]: authentication refused: bad ownership or modes for directory /home/wangshumin
feb 10 19:50:05 centoshostnamekl1 sshd[31967]: failed password for wangshumin from 192.168.72.101 port 46429 ssh2
feb 10 19:50:05 centoshostnamekl1 sshd[31967]: failed password for wangshumin from 192.168.72.101 port 46429 ssh2
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