檢查防火牆的狀態：
從centos7開始使用systemctl來管理服務和程序，包括了service和chkconfig。
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[root@localhost ~]#systemctl list-unit-files|grep firewalld.service --防火牆處於關閉狀態
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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關閉防火牆：
systemctl stop firewalld.service #停止firewall
systemctl disable firewalld.service #禁止firewall開機啓動
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[root@localhost ~]#systemctl stop firewalld.service
[root@localhost ~]#systemctl disable firewalld.service
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啓動一個服務：systemctl start firewalld.service
關閉一個服務：systemctl stop firewalld.service
重啓一個服務：systemctl restart firewalld.service
顯示一個服務的狀態：systemctl status firewalld.service
在開機時啓用一個服務：systemctl enable firewalld.service
在開機時禁用一個服務：systemctl disable firewalld.service
查看服務是否開機啓動：systemctl is-enabled firewalld.service;echo $?
查看已啓動的服務列表：systemctl list-unit-files|grep enabled
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