先使用vnc或者putty用密钥连接上服务器，修改root密码
sudo passwd root然后输入两次密码
修改centos登录方式为密码登录
打开配置文件 /etc/ssh/sshd_config (ubuntu 也为/etc/ssh/sshd_config)，设置如下几个参数:
PermitRootLogin yes
PubkeyAuthentication no （也可用#号注释）
PasswordAuthentication yes重启sshd服务
systemctl restart sshd OR service sshd restart
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