>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