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I am using RHEL 7. I want to know what's relationship between firewalld and iptables.

If I want to do some port forwarding, should I use firewall-cmd or iptables ?

when applying rules using iptables, do I need to disable firewalld and install iptables-service ?

I am running a kubenetes cluster, which is booted up with firewalld disabled, If I start firewalld service, I am afraid, It will mess up with kubernetes, as kubernetes already defined many rules.

I want to avoid firewalld, but applying rules with iptables command seems not working, and I can't install iptables-service too, those nodes have no internet access.

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If you have firewalld installed and running (that's optional) all the changes to your iptables should be done via the daemon and its commands, i.e. firewall-cmd.

If you want to manage iptables by yourself,

sudo systemctl stop firewalld
sudo systemctl disable firewalld
sudo systemctl mask --now firewalld # to make it impossible for other services to start it
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  • Don’t forget to make sure you have the ‘iptables-service’ package installed if you want to switch to maintaining your firewall manually.
    – jsbillings
    Jul 25, 2020 at 0:23

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