centos7 开启防火墙端口 firewalld

systemctl start firewalld
firewall-cmd --zone=public --add-port=3306/tcp --permanent
firewall-cmd --zone=public --add-port=22/tcp --permanent
firewall-cmd --zone=public --add-port=80/tcp --permanent
firewall-cmd --reload
firewall-cmd --zone=public --list-all