如何在 Centos 7 上启用防火墙?

How to enable firewall on Centos 7?

我的防火墙目前处于非活动状态。

# systemctl status firewalld
firewalld.service
    Loaded: masked (/dev/null)
    Active: inactive (dead)

我使用以下命令启用了防火墙

$systemctl unmask firewalld

但我遇到了这个错误

# systemctl unmask firewalld
Failed to issue method call: Access denied

请指教。

提前致谢!

试试这个:

sudo systemctl restart firewalld
sudo systemctl enable firewalld

但在您安装 firewalld 之前。您可以为此使用 yum

sudo yum install firewalld

试试这个:

systemctl unmask firewalld

return: Removed symlink /etc/systemd/system/firewalld.service.

之后,您可以:

systemctl restart firewalld