重启后使 iptables 规则持久化

Question

I'm trying to redirect my port 80 to 8080 because the user need not type the url as webapp:8080 to access the web site.

Here's the command that I came across to redirect from port 80 to 8080 :

sudo iptables -A PREROUTING -t nat -i enp0s25 -p tcp --dport 80 -j REDIRECT --to-port 8080

I'm now able to access the page as webapp/. But the problem now I'm facing is that I'm not able to access the page if I give webapp/ after I restart the system.

How do I fix this?

Answer 1

You can try this :

iptables-save > /etc/sysconfig/iptables

"/etc/sysconfig/iptables " is for centos, you need to find the same file on your linux OS :)

An other solution is to create a conf' file and use this file when the system boot :

• Create a file like "Conf_iptables".
• Add your rules to this file.
• Add execute privilege to root
• chkconfig Conf_iptables on

Moreover you have to create 2 iptables rules (for IPv4 and IPv6) if you want to use IPv6 :)

If you need help use this site (sorry but it's in french) : http://blog.sephirots.fr/?p=123

Answer 2

The only thing you need is to save iptables rules permanently. It can be various depend on linux distribution. For Debian/Ubuntu see for instance here:

https://www.thomas-krenn.com/en/wiki/Saving_Iptables_Firewall_Rules_Permanently

Answer 3

Ubuntu: Install iptables-persistent . This will create 2 files in /etc/iptables/rules.v4 and rules.v6

Run netfilter-persistent save .

Try rebooting the machine.