Setting CentOS 7 firewall

- public zone setting file

/etc/firewalld/zones/public.xml

- firewall reload

firewall-cmd --reload

- adding port

firewall-cmd --permanent --zone=public --add-port=80/tcp

- removing port

firewall-cmd --permanent --zone=public --remove-port=80/tcp

- adding service

firewall-cmd --permanent --zone=public --add-service=http

- removing service

firewall-cmd --permanent --zone=public --remove-service=http

- adding rule

firewall-cmd --permanent --zone=public --add-rich-rule="rule family=ipv4 source address=192.168.0.4/24 service name=http accept"

- removing rule

 firewall-cmd --permanent --zone=public --remove-rich-rule="rule family=ipv4 source address=192.168.0.4/24 service name=http accept"

original resource : https://www.conory.com/note_linux/42477