Record the method for CentOS 7 to close the system default firewall

We used to use CentOS's iptables firewall function before, but since CentOS 7, the default firewall is firewall, not iptables. If we need to close the firewall, after all, some projects will fail when using the firewall, so we can close it.

1、 Check whether the firewall is running

 firewall-cmd --state

SSH executes the above command. If running is prompted, it means running. If not running, it means not running.

2、 Turn off firewall

 Systemctl stop firewalld. service # Stop firewall Systemctl disable firewalld. service # Disable firewall startup

SSH executes the above command, turns off the firewall, and cancels the automatic startup after power on.

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