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CentOS7使用systemctl指令来管理系统的单一服务，在CentOS7中对于firewalld（防火墙）服务的开启、关闭、状态查询也同样是使用该指令，操作如下：
启动防火墙： systemctl start firewalld
查看防火墙状态： systemctl status firewalld
关闭防火墙： systemctl stop firewalld
开机时启用防火墙服务：systemctl enable firewalld
开机时禁用防火墙服务：systemctl disable firewalld
查询防火墙服务是否开机启动：systemctl is-enabled firewalld
查询已经启动的服务列表：systemctl list-unit-files|grep enabled
查询启动失败的服务列表：systemctl –failed
在安装软件或列库时，除了直接开启和关闭防火墙，也可以通过对端口的操作直接开放连接；添加端口：firewall-cmd –zone=public –add-port=80/tcp –permanent
更新防火墙规则：firewall-cmd –reload
查看端口状态：firewall-cmd –zone=public –query-port=80/tcp
删除开放的端口：firewall-cmd –zone=public –remove-port=80/tcp –permanent
每次都更新防火墙规则，都需要重新更新：firewall-cmd –reload，更新状态；
此外，在更新完防火墙的设置后，也可以查看所有开启的端口：firewall-cmd –zone=public –list-ports
