Enter command below in SSH session to redirect port 80 to port 8080. Port 8080 will keep working.
iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 8080
Verify it it is working. Then make sure the configuration will be loaded every time Linux starts.sudo iptables-save | sudo tee /etc/iptables.conf
to save your current iptables rules to
/etc/iptables.conf
and then insert these lines in /etc/rc.local
:# Load iptables rules from this file
iptables-restore < /etc/iptables.conf
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