This video shows how to add port, service in firewall and check status of open port in Centos 7 and Redhat.

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Commands-
To add port –
for example httpd
firewall-cmd –permanent –add-port=80/tcp
To remove port
firewall-cmd –permanent –remove-port=80/tcp
To reload firewall
firewall-cmd –complete-reload
To add multiple ports at once –
firewall-cmd –permanent –add-port={80,110,3306}/tcp
To check status of open ports
firewall-cmd –list-all