service firewalld status; #查看防火墙状态
systemctl start firewalld.service;#开启防火墙
systemctl stop firewalld.service;#关闭防火墙
systemctl restart firewalld.service; #重启防火墙
systemctl disable firewalld.service#禁止防火墙开启自启
systemctl enable firewalld#设置防火墙开机启动
yum remove firewalld#卸载firewall
安装iptables防火墙及操作:
#yum install iptables-services#安装iptables防火墙
#vi /etc/sysconfig/iptables#编辑防火墙配置文件,开放3306端口
添加配置:-A INPUT -p tcp -m state --state NEW -m tcp --dport 3306 -j ACCEPT
#systemctl restart iptables.service
#最后重启防火墙使配置生效
#systemctl enable iptables.service
#设置防火墙开机启动