FirewallD is not running code example

Example 1: firewalld not running centos 7

systemctl start firewalld

Example 2: FirewallD is not running

# check the status of the service (running and eanbled)
systemctl status firewalld

# if the service is not running, start it
systemctl start firewalld

# if the service has exited , restart it(check for error if any)
systemctl restart firewalld

# if the service is not enabled, enable it
systemctl enable firewalld

Example 3: is firewall running centos 7

systemctl status firewalld