You can stop Centos 7 firewall temporarily with this command:
sudo systemctl stop firewalld
Next time, when system boots, firewall will be turned on automatically.
To disable Centos 7 firewall permanently and prevent this firewall turned on again, use this command:
sudo systemctl disable firewalld
Further more, to prevent firewall is called from another programs:
sudo systemctl mask --now firewalld
With these commands, you can do anything with Centos 7 firewall from stop temporarily, disable permanently and prevent other process call firewall.
Beside that, we can check current status of Centos 7 firewall with this command:
sudo firewall-cmd --state