How to Disable Firewall in CentOS 7

To view the current status of the FirewallD service you can use the firewall-cmd command:
firewall-cmd –state

You can temporarily stop the FirewallD service with the following command:
systemctl stop firewalld

To permanently disable the firewall on your CentOS 7 system, follow the steps below:

1-First, stop the FirewallD service with:
sudo systemctl stop firewalld

2-Disable the FirewallD service to start automatically on system boot:
sudo systemctl disable firewalld

Mask the FirewallD service which will prevent the firewall from being started by other services:
systemctl mask –now firewalld

source

centos 7