CentOS 7.4利用Iptables开启远程访问
CentOS 7默认使用的是firewall作为防火墙，首先安装iptables防火墙。1、关闭firewall：
systemctl stop firewalld.service
systemctl disable firewalld.service
systemctl mask firewalld.service
2、安装iptables防火墙
yum install iptables-services -y
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3.启动设置防火墙
# systemctl enable iptables
# systemctl start iptables
4.查看防火墙状态
systemctl status iptables
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5编辑防火墙，增加端口
vi /etc/sysconfig/iptables #编辑防火墙配置文件
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-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT
:wq! #保存退出
3.重启配置，重启系统
systemctl restart iptables.service #重启防火墙使配置生效
systemctl enable iptables.service #设置防火墙开机启动
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