请帮我用 icingaweb 解决这个问题
icinga2:无法将外部 Icinga 命令发送到本地命令文件“/var/run/icinga2/cmd/icinga2.cmd”:权限被拒绝。
#0 /usr/share/icingaweb2/modules/monitoring/application/forms/Command/Object/ScheduleServiceDowntimeCommandForm.php(191): Icinga\Module\Monitoring\Command\Transport\CommandTransport->send(Object(Icinga\Module\Monitoring\Command\Object\ScheduleHostDowntimeCommand))
#1 /usr/share/icingaweb2/modules/monitoring/application/forms/Command/Object/ScheduleHostDowntimeCommandForm.php(108): Icinga\Module\Monitoring\Forms\Command\Object\ScheduleServiceDowntimeCommandForm->scheduleDowntime(Object(Icinga\Module\Monitoring\Command\Object\ScheduleHostDowntimeCommand), Object(Icinga\Web\Request))
#2 /usr/share/php/Icinga/Web/Form.php(1152): Icinga\Module\Monitoring\Forms\Command\Object\ScheduleHostDowntimeCommandForm->onSuccess()
#3 /usr/share/icingaweb2/modules/monitoring/library/Monitoring/Web/Controller/MonitoredObjectController.php(128): Icinga\Web\Form->handleRequest()
#4 /usr/share/icingaweb2/modules/monitoring/application/controllers/HostController.php(155): Icinga\Module\Monitoring\Web\Controller\MonitoredObjectController->handleCommandForm(Object(Icinga\Module\Monitoring\Forms\Command\Object\ScheduleHostDowntimeCommandForm))
#5 /usr/share/php/Zend/Controller/Action.php(516): Icinga\Module\Monitoring\Controllers\HostController->scheduleDowntimeAction()
#6 /usr/share/php/Icinga/Web/Controller/Dispatcher.php(76): Zend_Controller_Action->dispatch('scheduleDowntim...')
#7 /usr/share/php/Zend/Controller/Front.php(954): Icinga\Web\Controller\Dispatcher->dispatch(Object(Icinga\Web\Request), Object(Icinga\Web\Response))
#8 /usr/share/php/Icinga/Application/Web.php(384): Zend_Controller_Front->dispatch(Object(Icinga\Web\Request), Object(Icinga\Web\Response))
#9 /usr/share/php/Icinga/Application/webrouter.php(109): Icinga\Application\Web->dispatch()
#10 /usr/share/icingaweb2/public/index.php(4): require_once('/usr/share/php/...')
#11 {main}