查看centos版本：cat /etc/redhat-release

安装lrzsz：yum install lrzsz
上传公钥：rz
导入公钥：cat Public.pub >> .ssh/authorized_keys
修改ssh配置：vi /etc/ssh/sshd_config
RSAAuthentication yes
PubkeyAuthentication yes
PasswordAuthentication no
重启sshd：systemctl restart sshd
登录：ssh -i PrivateKey user@hostname -p port