CentOS 7 Firewall, Open Ports

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Basic usage of firewalld

Start: systemctl start firewalld
Check status: systemctl status firewalld
Stop: systemctl disable firewalld
Disable: systemctl stop firewalld

Add port: firewall-cmd --zone=public --add-port=80/tcp --permanent (--permanent makes it permanent, otherwise invalid after restart)
Reload: firewall-cmd --reload
Delete port: firewall-cmd --permanent --remove-port=666/tcp