Persist iptables even after reboot Ubuntu

iptables.md

Set the rules

sudo iptables -A INPUT -i eth0 -p tcp --dport 80 -j ACCEPT
sudo iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 3000

On Ubuntu: sudo apt-get install iptables-persistent

After that, run next commands every time you want save iptables changes permanently:

sudo netfilter-persistent save
sudo netfilter-persistent reload

If you have pm2, run pm2 startup and pm2 save

If the network interface is different

sudo iptables -t nat -A PREROUTING -i ens5 -p tcp --dport 80 -j REDIRECT --to-port 3000