项目场景：

在Centos7.8上启动firewall防火墙

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问题描述：

在启用firewall时，出现以下提示

[@localhost view01]# systemctl status firewalld
● firewalld.service
   Loaded: masked (/dev/null; bad)
   Active: inactive (dead)

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原因分析：

提示：
firewall服务被冻结导致。

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解决方案：

提示：

[root@localhost view01]# systemctl unmask  firewalld    --解除冻结
Removed symlink /etc/systemd/system/firewalld.service.
[root@localhost view01]# systemctl start firewalld          --启动服务
[root@localhost view01]# systemctl status firewalld       --查看服务的状态
● firewalld.service - firewalld - dynamic firewall daemon
   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled)
   Active: active (running) since 二 2021-12-14 09:37:17 CST; 2s ago
     Docs: man:firewalld(1)
 Main PID: 16199 (firewalld)
    Tasks: 2
   CGroup: /system.slice/firewalld.service
           └─16199 /usr/bin/python2 -Es /usr/sbin/firewalld --nofork --nopid

12月 14 09:37:16 localhost.localdomain systemd[1]: Starting firewalld - dynamic firewall daemon...
12月 14 09:37:17 localhost.localdomain systemd[1]: Started firewalld - dynamic firewall daemon.
12月 14 09:37:18 localhost.localdomain firewalld[16199]: WARNING: AllowZoneDrifting is enabled. This is considered an insecure con...t now.
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