First install firewall on your system :
yum install firewalld -y
Now start & enable firewall :
systemctl start firewalld systemctl enable firewalld systemctl status firewalld
Now see how many zones in your system & who is your default zone :
firewall-cmd --get-zones firewall-cmd --get-default-zone
Your default zone must be public if not then set default zone to public or your system may not work properly :
Now see the permanent list of all services & ports on your public zone :
firewall-cmd --permanent --zone=public --list-all
If you need to add any service on your public zone then you can add like this :
firewall-cmd --permanent --zone=public --add-service=http firewall-cmd --permanent --zone=public --list-services
If you want to remove any service from your public zone you can do like this :
firewall-cmd --permanent --zone=public --remove-service=http
Now add a port to public zone & remove it if you need by this command :
firewall-cmd --permanent --zone=public --add-port=2222/tcp firewall-cmd --zone=public --list-ports firewall-cmd --permanent --zone=public --remove-port=25/tcp
Thank you for reading this article.
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