How to open specific port in Cent OS permanently

Hello everybody,

today I want to document how to permanently open port in CentOS linux permanently. You can achieve it with following command:

firewall-cmd --zone=public --add-port=22/tcp --permanent

or with usage of iptables:

iptables -I INPUT -p tcp -m tcp --dport 80 -j ACCEPT

Key --permanent ensures that port will remain working after the reboot.

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