How to save rules of the iptables?

The easy way is to use iptables-persistent.

Install iptables-persistent:

sudo apt-get install iptables-persistent

After it's installed, you can save/reload iptables rules anytime:

sudo /etc/init.d/iptables-persistent save 
sudo /etc/init.d/iptables-persistent reload

Ubuntu 16.04 Server

The installation as described above works without a problem, but the two commands for saving and reloading above do not seem to work with a 16.04 server. The following commands work with that version:

sudo netfilter-persistent save
sudo netfilter-persistent reload

来源： https://askubuntu.com/questions/119393/how-to-save-rules-of-the-iptables