• 安装OpenSSH

    • sudo apt-get install openssh-server openssh-client
    • sudo yum install openssh-server openssh-client

  • 查看22端口是否开通

    • netstat -tnl

  • 开通22端口

  • 关闭防火墙

    systemctl stop firewalld

    systemctl mask firewalld

  • 安装iptables-services

    yum install iptables-services

  • 设置开机启动

    systemctl enable iptables

  • 保存设置

    service iptables save

  • 编辑防火墙打开22端口

    vi /etc/sysconfig/iptables

  • 加入如下命令

    -A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT

  • 重启防火墙

    service iptables restart