How to check whether the firewall is enabled in centos7

1. Firewall opening, closing, and disabling commands

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(1) Settings Enable the firewall at boot: systemctl enable firewalld.service

(2) Set the firewall to be disabled at boot: systemctl disable firewalld.service

(3) Start the firewall: systemctl start firewalld

（ 4) Turn off the firewall: systemctl stop firewalld

(5) Check the firewall status: systemctl status firewalld

2. Use firewall-cmd to configure the port

(1) View firewall status: firewall-cmd --state

(2) Reload configuration: firewall-cmd --reload

(3) View open Port: firewall-cmd --list-ports

(4) Open the firewall port: firewall-cmd --zone=public --add-port=9200/tcp --permanent

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