If you would like to open port 1234 for the IP address 1.2.3.4 with the firewall-cmd command on a CentOS 7.1 server:
firewall-cmd --permanent --zone=public --add-rich-rule=' rule family="ipv4" source address="1.2.3.4/32" port protocol="tcp" port="1234" accept'
Check the zone file later to inspect the XML configuration
cat /etc/firewalld/zones/public.xml
Reload the firewall
firewall-cmd --reload
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