1、firewalld的基本使用
启动: systemctl start firewalld
关闭: systemctl stop firewalld
查看状态: systemctl status firewalld
开机禁用  : systemctl disable firewalld
开机启用  : systemctl enable firewalld
2.systemctl是CentOS7的服务管理工具中主要的工具,它融合之前service和chkconfig的功能于一体。

启动一个服务:systemctl start firewalld.service
关闭一个服务:systemctl stop firewalld.service
重启一个服务:systemctl restart firewalld.service
显示一个服务的状态:systemctl status firewalld.service
在开机时启用一个服务:systemctl enable firewalld.service
在开机时禁用一个服务:systemctl disable firewalld.service
查看服务是否开机启动:systemctl is-enabled firewalld.service
查看已启动的服务列表:systemctl list-unit-files|grep enabled
查看启动失败的服务列表:systemctl –failed

3.配置firewalld-cmd

查看版本: firewall-cmd –version
查看帮助: firewall-cmd –help
显示状态: firewall-cmd –state
查看所有打开的端口: firewall-cmd –zone=public –list-ports
更新防火墙规则: firewall-cmd –reload
查看区域信息:  firewall-cmd –get-active-zones
查看指定接口所属区域: firewall-cmd –get-zone-of-interface=eth0
拒绝所有包:firewall-cmd –panic-on
取消拒绝状态: firewall-cmd –panic-off
查看是否拒绝: firewall-cmd –query-panic
那怎么开启一个端口呢
添加
firewall-cmd –zone=public –add-port=80/tcp –permanent    (–permanent永久生效,没有此参数重启后失效)
重新载入
firewall-cmd –reload
查看
firewall-cmd –zone= public –query-port=80/tcp
删除
firewall-cmd –zone= public –remove-port=80/tcp –permanent

一、防火墙的开启、关闭、禁用命令

(1)设置开机启用防火墙:systemctl enable firewalld.service

(2)设置开机禁用防火墙:systemctl disable firewalld.service

(3)启动防火墙:systemctl start firewalld

(4)关闭防火墙:systemctl stop firewalld

(5)检查防火墙状态:systemctl status firewalld

二、使用firewall-cmd配置端口

(1)查看防火墙状态:firewall-cmd –state

(2)重新加载配置:firewall-cmd –reload

(3)查看开放的端口:firewall-cmd –list-ports

(4)开启防火墙端口:firewall-cmd –zone=public –add-port=9200/tcp –permanent

命令含义:

–zone #作用域

–add-port=9200/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

注意:添加端口后,必须用命令firewall-cmd –reload重新加载一遍才会生效

(5)关闭防火墙端口:firewall-cmd –zone=public –remove-port=9200/tcp –permanent