1、CentOS7–Centos7 防火墙常用配置及说明
转置:https://www.cnblogs.com/beyang/p/10121108.html
2、CentOS7防火墙指定开放端口
firewall-cmd --state
转置:https://blog.youkuaiyun.com/qq_38279833/article/details/106496528
3、CentOS7–关于Centos7 firewalld防火墙开放端口后仍不能访问ftp和nginx的问题解决
重点:需要重启防火墙
systemctl restart firewalld.service
转置:https://www.cnblogs.com/cui0614/p/12746383.html