检查防火墙的状态：
从centos7开始使用systemctl来管理服务和程序，包括了service和chkconfig。
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[root@localhost ~]#systemctl list-unit-files|grep firewalld.service --防火墙处于关闭状态
firewalld.service disabled
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或者
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[root@localhost ~]#systemctl status firewalld.service
● firewalld.service - firewalld - dynamic firewall daemon
Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled)
Active: inactive (dead)
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关闭防火墙：
systemctl stop firewalld.service #停止firewall
systemctl disable firewalld.service #禁止firewall开机启动
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[root@localhost ~]#systemctl stop firewalld.service
[root@localhost ~]#systemctl disable firewalld.service
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启动一个服务：systemctl start firewalld.service
关闭一个服务：systemctl stop firewalld.service
重启一个服务：systemctl restart firewalld.service
显示一个服务的状态：systemctl status firewalld.service
在开机时启用一个服务：systemctl enable firewalld.service
在开机时禁用一个服务：systemctl disable firewalld.service
查看服务是否开机启动：systemctl is-enabled firewalld.service;echo $?
查看已启动的服务列表：systemctl list-unit-files|grep enabled
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