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ssh免密码：要从机器A免密码登录到机器B：需要把在A机器生成的公钥id_dsa.pub添加到.ssh/authorzied_keys文件里
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ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa 生成公钥id_dsa.pub和私钥id_dsa
cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys----------------------------------------------------------------------------------------------------------------------------------------------------------------
linux下设置了SSH免密码登录但还是需要输入密码的解决办法 ：
直接给.ssh目录全部删除了，重新生成公钥和私钥；
机器一：192.168.1.63
机器二：192.168.1.65
step1
机器一：
ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa 生成公钥id_dsa.pub和私钥id_dsa
cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys然后输入：ssh localhost
The authenticity of host '192.168.1.67 (192.168.1.67)' can't be established.
RSA key fingerprint is 9e:0d:51:dc:31:b0:55:4e:34:05:ee:fd:ae:42:c9:a4. Are you sure you want to continue connecting (yes/no)? yes第一次登录要求输入密码，密码正确后，成功登录；
然后退出exit;
【验证】再次登录就不用输入密码了！
step2
机器二：同机器一操作：
step3
最后把机器一中的 ~/.ssh/id_dsa.pub远程拷贝到机器二/tmp下，具体的shell如下：
scp /root/.ssh/id_dsa.pub
The authenticity of host '192.168.1.65 (192.168.1.65)' can't be established.
RSA key fingerprint is 9e:0d:51:dc:31:b0:55:4e:34:05:ee:fd:ae:42:c9:a4. Are you sure you want to continue connecting (yes/no)? yes此时要求输入登录机器二的密码，密码正确后，才允许远程拷贝！！；
然后在机器二中执行以下shell：
cat /tmp/id_dsa.pub >> ~/.ssh/authorized_keys
在机器一执行: ssh 192.168.1.65
发现这次不用输入密码了！！！
到此为止，恭喜你，可以从机器一免密码登录到机器二了！！！！！赶快试试吧！
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