将端口80映射到8080（此时监听80端口的服务将无法接收数据，因为80端口的数据被转发到8080端口了）
- Centos6
iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-ports 8080
service iptables save
service iptables restart
- Centos7
yum install iptables-services
systemctl enable iptables
iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-ports 8080
service iptables save
systemctl restart iptables
参考文献：
https://blog.csdn.net/nainaiqiuwencun/article/details/80697388
https://blog.csdn.net/at99ak77/article/details/46739043
https://blog.csdn.net/c233728461/article/details/52679558