vim /etc/ssh/sshd_config

#增加以下三项
RSAAuthentication yes
PubkeyAuthentication yes
AuthorizedKeysFile    .ssh/authorized_keys

[root@localhost /]# mkdir .ssh

[root@localhost /]# cd .ssh
[root@localhost .ssh]# touch

[root@localhost .ssh]# vim authorized_keys

[root@localhost .ssh]# chmod 644

[root@localhost .ssh]# systemctl restart sshd