1. 修改root密码(可选)
sudo passwd root
2. 修改ssh配置文件
sudo sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config
3. 重启ssh服务
sudo systemctl restart sshd
sudo passwd root
sudo sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config
sudo systemctl restart sshd
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