环境：阿里云ECS、centos 7
一、防火墙配置
配置lnmp环境后mysql无法远程登录，记录一下配置iptables防火墙的步骤
1、检测并关闭firewall
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systemctl status firewalld.service #检测是否开启了firewall
systemctl stop firewalld.service #关闭firewall
sytsemctl disable firewalld.service #禁止firewall开机自启
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2、检测并安装iptables
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yum install iptables-services
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将规则写入iptables配置文件
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vi /etc/sysconfig/iptables
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iptables文件内容：
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*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 22 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
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systemctl restart iptables.service
systemctl enable iptables.service
二、关闭SELINUX
vim /etc/selinux/config
#注释以下配置
SELINUX=enforcing
SELINUXTYPE=targeted
#增加以下配置
SELINUX=disabled
#保存退出
:wq!
#使配置立即生效
setenforce 0