To disable firewalld, run the following command as root:

# systemctl disable firewalld

To stop firewalld, run the following command as root:

# systemctl stop firewalld

To check the status of firewalld, run the following command as root:

# systemctl status firewalld

To enable firewalld, run the following command as root:

# systemctl enable firewalld

To start firewalld, run the following command as root:

# systemctl start firewalld

Other information:

https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Security_Guide/sec-Using_Firewalls.html