centos7 firewall

1. 开启端口

firewall-cmd --zone=public --add-port=80/tcp --permanent　　#开放80端口

命令含义：

 --zone #作用域
 --add-port=80/tcp  #添加端口，格式为：端口/通讯协议
 --permanent   #永久生效，没有此参数重启后失效
```　　
 
centos7 防火墙常用操作

firewall-cmd --state
view status of firewalld service (systemctl status firewalld)
firewall-cmd --zone=public --list-all
gets all info for the “public” zone
firewall-cmd --list-all-zones
shows all info for all zones
firewall-cmd --zone=public --add-port=80/tcp --permanent
adds port 80 to public zone
firewall-cmd --zone=public --add-service=http --permanent
adds service http to public zone
firewall-cmd --reload
run this after making changes
firewall-cmd --zone=public --remove-port=80/tcp --permanent
to remove port 80 from public zone
firewall-cmd --get-default-zone
shows default zone for firewall
firewall-cmd --get-active-zones
zones where network interfaces or sources are assigned

设置开机起动: 

systemctl enable httpd.service