local ipaddress：10.47.39.7；remote ipaddress：10.47.39.8

1、生成公鑰和私鑰

[root@local ~]# ssh-keygen -t rsa #一路回車

2、生成完後在.ssh目錄裏會看全id_isa和id_rsa.pub兩個文件

[root@local ~]# cd .ssh/
[root@local .ssh]# ls
id_rsa id_rsa.pub known_hosts

3、復制id_rsa.pub文件到需要登陸的遠程主機的.ssh目錄

[root@local .ssh]# scp id_rsa.pub [email protected]:/root/.ssh/

4、在遠程主機上把id_rsa.pub文件重命名為authorized_keys

[root@remote .ssh]# mv id_rsa.pub authorized_keys

[root@remote .ssh]# ls
authorized_keys known_hosts

5、測試

[root@local ~]# ssh 10.47.39.8
Last login: Mon Dec 25 17:00:45 2017 from 10.47.39.7
[root@remote ~]#

SSH免密鑰登陸