add port to firewall centos code example

Example 1: firewall-cmd add port 8080

sudo firewall-cmd --zone=public --permanent --add-port=5000/tcp
sudo firewall-cmd --zone=public --permanent --add-port=4990-4999/udp
sudo firewall-cmd --zone=public --permanent --list-ports

Example 2: install firewall-cmd centos 7

sudo yum install firewalld
sudo systemctl enable firewalld
sudo reboot

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