Centos防火墙解锁
1、启动防火墙# systemctl start firewalld
Failed to start firewalld.service: Unit is masked.
（启动防火墙失败：防火墙被锁定）
二、解决方法
1、防火墙解锁
# systemctl unmask firewalld
输出如下结果：
Removed symlink /etc/systemd/system/firewalld.service.
（移除符号链接）
2、再次启动firewalld：
# systemctl start firewalld
3、查看firewalld状态：
# systemctl status firewalld
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