Unit firewalld.service could not be found. 防火墙命令找不到

# systemctl status firewalld
Unit firewalld.service could not be found.
# systemctl stop firewalld.service
Failed to stop firewalld.service: Unit firewalld.service not loaded.

解决办法：

yum install firewalld
参考链接：https://blog.csdn.net/bo123_/article/details/101484987

查看防火墙状态
firewall-cmd --state
systemctl status firewalld
停止firewall
systemctl stop firewalld.service
禁止firewall开机启动
systemctl disable firewalld.service