1.關閉默認的firewall防火牆
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systemctl stop firewalld.service #停止firewall systemctl disable firewalld.service #禁止firewall開機啟動 firewall-cmd --state #查看默認防火牆狀態（關閉后顯示notrunning，開啟后顯示running）
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2.開啟iptables
yum install iptables （根據centOS7的版本和內核，有些版本已經裝過，可以跳過此命令） yum install iptables-services service iptables restart chkconfig iptables on或者systemctl enable iptables.service開機自啟</span> 3.編輯防火牆文件（開啟了21,22,80,3306端口） vim /etc/sysconfig/iptables <span style="font-size:18px;"># sampleconfiguration for iptables service # # you can edit thismanually or use system-config-firewall # # please do not askus to add additional ports/services to this default configuration *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A INPUT -p icmp -j ACCEPT -A INPUT -i lo -j ACCEPT -A INPUT -p tcp -m state --state NEW -m tcp --dport 21 -j ACCEPT -A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT -A INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT -A INPUT -p tcp -m state --state NEW -m tcp --dport 3306 -j ACCEPT -A INPUT -j REJECT --reject-with icmp-host-prohibited -A FORWARD -j REJECT --reject-with icmp-host-prohibited COMMIT
centos 需要開啟此防火牆！