Reset firewalld rules to default?

Question

On CentOS 7 have I been trying out different firewalld rules and iptables commands, and now want to do it all over, but only using firewalld.

Question

How can I reset all rules to the default that CentOS 7's firewalld ships with?

Solution 1

Following piece of Code may be helpful for you.

for srv in $(firewall-cmd --list-services);do firewall-cmd --remove-service=$srv; done firewall-cmd --add-service={ssh,dhcpv6-client} firewall-cmd --runtime-to-permanent

Regards,

Ahmer Mansoor

Solution 2

You may simply delete the files containing the customized zone rules from /etc/firewalld/zones (or /usr/etc/firewalld/zones, depending on the distribution). After that, reload firewalld with firewall-cmd --complete-reload, and it should start using the default settings. When you make changes to the zone rules, files will appear again in that directory.

As for iptables, you may reset all rules with iptables -F. Rebooting works as well, unless you implemented some sort of persistency. Beware that firewalld may be configured to use iptables as its backend, which means it will add or remove iptables rules itself, according to what you specified in its zone rules.

Solution 3

If you trully want to delete everything as John Ashpool say's

rm -rf /etc/firewalld/zones or /usr/etc/firewalld/zones depending on your distro

and

iptables -X
iptables -F
iptables -Z

plus

systemctl restart firewalld

and then you have a new set of rules and zones ;)

Solution 4

Personally I would just remove all the services and rules from all the zones you have edited. Except for SSH in case you are working on a remote server. That is easy: sudo firewall-cmd --zone=WHATEVER --remove-service=WHATEVER

And after all have been removed, just sudo firewall-cmd --runtime-to-permanent

HOWEVER: If you haven't saved the firewall rules, then just restart with systemctl restart firewalld

I don't think there is any reset function in it.

View more solutions

Comments

[Daniel Shterenberg]

This will not remove the manual iptables rules I have made.

[Bert]

Then you want to reset iptables, not firewall. kerneltalks.com/virtualization/…

[Tristan CHARBONNIER]

I had to also remove /etc/firewalld/direct.xml which was containing custom rules I added.

[denn0n]

I did not knew that Tristan Thank you !