编辑这个文件：
/etc/ssh/sshd_config
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# Change to no to disable s/key passwords #ChallengeResponseAuthentication yes ChallengeResponseAuthentication no |
修改为：
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# Change to no to disable s/key passwords ChallengeResponseAuthentication yes #ChallengeResponseAuthentication no |
然后编辑这个文件
vi /root/.ssh/authorized_keys
将里边的内容删除ssh-rsa前的所有内容