linux系統之FirewallD is not running

開啓80端口時：

firewall-cmd --add-port=80/tcp --permanent

 報錯：

FirewallD is not running

 通過終端輸入：

systemctl status firewalld

查看firewalld狀態，發現當前是dead狀態，即防火牆未開啓。結果如下：

● firewalld.service - firewalld - dynamic firewall daemon
   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled)
   Active: inactive (dead)
     Docs: man:firewalld(1)

終端輸入：

systemctl start firewalld

開啓防火牆，沒有任何提示即開啓成功。

再次通過systemctl status firewalld查看firewalld狀態，顯示running即已開啓了，結果如下：

● firewalld.service - firewalld - dynamic firewall daemon
   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled)
   Active: active (running) since 二 2019-12-10 23:33:49 CST; 1min 7s ago
     Docs: man:firewalld(1)
 Main PID: 2835 (firewalld)
    Tasks: 2
   CGroup: /system.slice/firewalld.service
           └─2835 /usr/bin/python2 -Es /usr/sbin/firewalld --nofork --nopid

12月 10 23:33:48 fuyun systemd[1]: Starting firewalld - dynamic firewall d.....
12月 10 23:33:49 fuyun systemd[1]: Started firewalld - dynamic firewall daemon.
Hint: Some lines were ellipsized, use -l to show in full.

注意：如果要關閉防火牆設置，可能通過systemctl stop firewalld這條指令來關閉該功能。

再次執行：

firewall-cmd --add-port=80/tcp --permanent

則就成功了，結果如下：

[root@fuyun ~]# firewall-cmd --add-port=80/tcp --permanent
success