解决方案

如果在执行命令时出现语法错误，可能会出现以下类型的错误：

# firewall-cmd -state
usage: see firewall-cmd man page
firewall-cmd: error: unrecognized arguments: -state

# firewall -cmd --state
-bash: firewall: command not found

在 CentOS/RHEL 7 中停止 firewalld

可以执行以下命令来停止防火墙：

# systemctl stop firewalld

例如：

# systemctl status firewalld
firewalld.service - firewalld - dynamic firewall daemon
   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled)
   Active: active (running) since Thu 2015-03-12 09:31:07 IST; 5h 33min ago
 Main PID: 814 (firewalld)
   CGroup: /system.slice/firewalld.service
           └─814 /usr/bin/python -Es /usr/sbin/firewalld --nofork --nopid
Mar 12 09:31:06 rhel7-server systemd[1]: Starting firewalld - dynamic firewall daemon...
Mar 12 09:31:07 rhel7-server systemd[1]: Started firewalld - dynamic firewall daemon.

# firewall-cmd --state
running
# systemctl stop firewalld
# firewall-cmd --state
not running

在 CentOS/RHEL 7 中禁用 firewalld

可以执行以下命令以禁用服务（关闭服务以备下次重启或者任何其他触发器。
）

# systemctl disable firewalld.service

例如：

# systemctl disable firewalld.service
rm '/etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service'
rm '/etc/systemd/system/basic.target.wants/firewalld.service'

在 CentOS/RHEL 7 中启用 firewalld

要再次启用 firewalld 服务，请使用以下命令：

# systemctl enable firewalld.service

例如：

# systemctl enable firewalld.service
ln -s '/usr/lib/systemd/system/firewalld.service' '/etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service'
ln -s '/usr/lib/systemd/system/firewalld.service' '/etc/systemd/system/basic.target.wants/firewalld.service'

验证是否在 CentOS/RHEL 7 中启用或者禁用了 firewalld

# systemctl is-enabled firewalld
disabled

# systemctl is-enabled firewalld
enabled

问题

在 CentOS/RHEL 7 中，为什么在执行 firewall-cmd -state 命令时会出现以下错误：

-bash: firewall: command not found