nagios无法取得返回值，查看nagios日志，部分内容如下：
[1393767393] Warning: The check of service 'CurrentLoad' on host 'kafka-1' looks like it was orphaned (results never came back). I'm scheduling an immediate check of the service...
[1393767393] Warning: The check of service 'CurrentSwap' on host 'kafka-1' looks like it was orphaned (results never came back). I'm scheduling an immediate check of the service...
[1393767393] Warning: The check of service 'CurrentDisk' on host 'mal-0' looks like it was orphaned (results never came back). I'm scheduling an immediate check of the service...
[1393767393] Warning: The check of service 'CurrentMem' on host 'mysql-0' looks like it was orphaned (results never came back). I'm scheduling an immediate check of the service...
[1393767393] Warning: The check of service 'CurrentSwap' on host 'solr-1' looks like it was orphaned (results never came back). I'm scheduling an immediate check of the service...
[1393767393] Warning: The check of service 'CurrentDisk' on host 'web-1' looks like it was orphaned (results never came back). I'm scheduling an immediate check of the service...
[1393767393] Warning: The check of service 'CurrentDisk' on host 'web-2' looks like it was orphaned (results never came back). I'm scheduling an immediate check of the service...
[1393767393] Warning: The check of service 'CurrentSwap' on host 'web-2' looks like it was orphaned (results never came back). I'm scheduling an immediate check of th
ps -ef|grep nagios 查看显示两个nagios进程
解决：
pkill nagios 杀掉所有nagios进程
/etc/init.d/nagios start 启动
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