Centos7 Firewall-cmd usage

http://havee.me/linux/2015-01/using-firewalls-on-centos-7.html
https://oracle-base.com/articles/linux/linux-firewall-firewalld
https://oracle-base.com/articles/linux/linux-firewall
https://access.redhat.com/documentation/en/red-hat-enterprise-linux/

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