一、配置防火牆，開啟80端口、3306端口
CentOS 7.0默認使用的是firewall作為防火牆，這里改為iptables防火牆。
1、關閉firewall：
systemctl stop firewalld.service #停止firewall
systemctl disable firewalld.service #禁止firewall開機啟動
2、安裝iptables防火牆
yum install iptables-services #安裝
vi /etc/sysconfig/iptables #編輯防火牆配置文件
# Firewall configuration written by system-config-firewall
# Manual customization of this file is not recommended.
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
:wq! #保存退出
systemctl restart iptables.service #最后重啟防火牆使配置生效
systemctl enable iptables.service #設置防火牆開機啟動
二、關閉SELINUX
vi /etc/selinux/config
#SELINUX=enforcing #注釋掉
#SELINUXTYPE=targeted #注釋掉
SELINUX=disabled #增加
:wq! #保存退出
setenforce 0 #使配置立即生效