CentOs 防火墙开启关闭方法

关于开启关闭防火墙、开机启动等。我的系统是CentOs7，重装换了CentOs8

1. 查看防火墙状态 systemctl |grep firewalld.service
2. 关闭防火墙 systemctl stop firewalld.service
3. 开启防火墙 systemctl start firewalld.service systemctl restart firewalld.service
4. 自启动

# 关闭自启动
systemctl disable firewalld.service

# 打开自启动
systemctl enable firewalld.service

# 查询自启动服务
systemctl list-unit-files|grep firewalld.service

扩展知识：systemctl is-enabled iptables.service#查询服务是否开机启动systemctl is-enabled servicename.service #开机运行服务systemctl enable *.service #取消开机运行systemctl disable *.service #启动服务systemctl start *.service #停止服务systemctl stop *.service #重启服务systemctl restart *.service #重新加载服务配置文件systemctl reload *.service #查询服务运行状态systemctl status *.service #显示启动失败的服务systemctl --failed

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