CentOS 7 Firewall examples

#Disable Firewall
service firewalld stop

#List the default zone
firewall-cmd  --get-default-zone

#Get current zone
firewall-cmd  --get-active-zone

#Move to internal
firewall-cmd --set-default-zone=internal

#Enable samba on a zone
firewall-cmd --zone=internal --add-service=samba
firewall-cmd --permanent --zone=internal --add-service=samba
firewall-cmd --permanent --zone=internal --add-service=http
firewall-cmd --zone=internal --add-port=41872/tcp

#Firewall reload from the permanent settings
firewall-cmd --reload

#View settings
firewall-cmd --list-all