一、开机后，改ssh root登录
echo root:要修改的密码 |sudo chpasswd root
sudo sed -i 's/^#\?PermitRootLogin.*/PermitRootLogin yes/g' /etc/ssh/sshd_config;
sudo sed -i 's/^#\?PasswordAuthentication.*/PasswordAuthentication yes/g' /etc/ssh/sshd_config;
sudo sed -i 's/^#\?ChallengeResponseAuthentication.*/ChallengeResponseAuthentication yes/g' /etc/ssh/sshd_config;
sudo service sshd restart二、开端口
*****开端口前，先去子网那里添加一条规则：0.0.0.0/0
sudo iptables -P INPUT ACCEPT
sudo iptables -P FORWARD ACCEPT
sudo iptables -P OUTPUT ACCEPT
sudo iptables -F三、….
