How to Set Up a Firewall on AlmaLinux

AlmaLinux uses firewalld as its default firewall.

Check Status

systemctl status firewalld\nfirewall-cmd --state

Allow Services

firewall-cmd --permanent --add-service=http\nfirewall-cmd --permanent --add-service=https\nfirewall-cmd --permanent --add-service=ssh\nfirewall-cmd --reload

Allow Custom Port

firewall-cmd --permanent --add-port=3000/tcp\nfirewall-cmd --reload

Remove Rule

firewall-cmd --permanent --remove-port=3000/tcp\nfirewall-cmd --reload

View Rules

firewall-cmd --list-all