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通过yum安装好mysql 之后, 查看防火墙配置开发端口。由于阿里云
CentOS7默认的防火墙不是iptables，而是firewalle.
出现此情况可能是iptables防火墙未安装。
执行下面命令：
#停止firewalld服务
systemctl stop firewalld
#禁用firewalld服务
systemctl mask firewalld
开启
systemctl unmask firewalld
安装iptables-services：
yum install iptables-services
设置开机启动：
systemctl enable iptables
systemctl [stop|start|restart] iptables
#or
service iptables [stop|start|restart]
service iptables save
#or
/usr/libexec/iptables/iptables.init save
然后
service iptables status
开启： service iptables start
关闭： service iptables stop
然后配置端口，
vim /etc/sysconfig/iptables
# sample configuration for iptables service
# you can edit this manually or use system-config-firewall
# please do not ask us 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 22 -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 3306 -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 8080 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
最后 重要一步！上阿里云控制台 添加安全组规则！
然后就可以了！
