By default Iptables rules will not survive through a server reboot! Find out how to accomplish saving your firewall rules (along with some handy commands) on Debian/Ubuntu and CentOS/RedHat servers.Let's dive into some useful commands and see how to persist Iptables rules.
We can use some basic commands to output the current ruleset as text, and a command that will take that text and apply them as the current ruleset.
sudo iptables-save sudo iptables-restore
For Example, to save iptables rules:
sudo iptables-save > ~/rules.v4
Later, we can restore those rules:
sudo iptables-restore < ~/rules.v4
Persisting Rules through Reboots (Debian/Ubuntu)
Use this with
iptables-persistent (in Debian):
sudo apt-get install -y iptables-persistent sudo service iptables-persistent start sudo iptables-save > /etc/iptables/rules.v4 sudo service iptables-persistent restart
Persisting Rules through Reboots (CentOS/RedHat)
We won't need to install anything to do this on these distributions of Linux.
You can run the following:
sudo chkconfig iptables on sudo service iptables save sudo service iptables start
You'll find your IPv4 and IPv6 rule files at