persist port routing from 80 to 8080

You can add this command in /etc/rc.local , so it will be executed automatically after reboot .

Use the iptables-save command instead.

Firewall rules should never go into rc.local script. rc.local is the last thing to be executed. If a block rule has been placed into rc.local there is a small time frame where an attacker can exploit a rule not being in place.

While it probably doesn't matter with this situation, it is still best to not get into a bad habit that may bite you later.

Here is how the official iptables' documentation teaches us. See here

Add these two lines in /etc/network/interfaces:

pre-up iptables-restore < /etc/iptables.rules
post-down iptables-save > /etc/iptables.rules

The line post-down iptables-save > /etc/iptables.rules will save the rules to be used on the next boot.