無密碼登陸

server A /B

以root賬戶在A上無密碼ssh到B

方式一

ON A:

ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa
cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys
chmod 644  ~/.ssh/authorized_keys
service sshd restart

?

ON B:

ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa
cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys
chmod 644  ~/.ssh/authorized_keysscp -r root@A:/root/.ssh/id_dsa.pub     /root/.ssh/master_dsa.pub
cat ~/.ssh/master_dsa.pub >> ~/.ssh/authorized_keys
service sshd restart

?note:上面ssh-keygen生成的文件id_dsa不能修改為其他的名稱，否則會導致SSH無法生效。

?

?方式二

serverA無密碼登陸 serverB

在serverA上

?

ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa
ssh-copy-id -i ~/.ssh/id_rsa.pub  ll2v@serverB

然后可以再serverA上無密碼登陸到serverB了