1、在主服務器master下生成密鑰
$ ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa
2、將密鑰放在 ~/.ssh/authorized_keys
$ cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys
3、對生成的文件authorized_keys授權
chmod 600 ~/.ssh/authorized_keys
4、編輯sshd_config文件,將下面三列#去掉
vim /etc/ssh/sshd_config
RSAAuthentication yes
PubkeyAuthentication yes
AuthorizedKeysFile .ssh/authorized_keys
5、重啟sshd 服務(可省略)
service sshd restart
6、驗證無驗證登陸
ssh localhost
7 配置master無密鑰登陸slave(以此可以配置master無密鑰登陸slaveX)
注釋:root為root用戶,master為主機名
[root@slaver ~]# scp -r root@master :/root/.ssh/id_dsa.pub /root/.ssh/slaver.pub
[root@slaver ~]# cat ~/.ssh/slaver.pub >> ~/.ssh/authorized_keys
chmod 600~/.ssh/authorized_keys
vim /etc/ssh/sshd_config
RSAAuthentication yes
PubkeyAuthentication yes
AuthorizedKeysFile .ssh/authorized_keys
service sshd restart
CentOS 下SSH無密碼登錄的配置 http://www.linuxidc.com/Linux/2012-05/61346.htm
Linux下實現SSH無密碼驗證登陸 http://www.linuxidc.com/Linux/2014-01/95917.htm
Ubuntu和CentOS如何配置SSH使得無密碼登陸 http://www.linuxidc.com/Linux/2014-01/94794.htm