nagios日志报错：
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NPCD ERROR: Executed command exits with return code '7'
查看perfdata.log日志：
tail -n 50 /usr/local/pnp4nagios/var/perfdata.log
2014-10-08 17:13:29 [331] [0] *** TIMEOUT: Timeout after 15 secs. ***
2014-10-08 17:13:29 [331] [0] *** TIMEOUT: Deleting current file to avoid NPCD loops
2014-10-08 17:13:29 [331] [0] *** TIMEOUT: Please check your process_perfdata.cfg
2014-10-08 17:13:29 [331] [0] *** TIMEOUT: /usr/local/pnp4nagios/var/spool/service-perfdata.1412759592-PID-331 deleted
2014-10-08 17:13:29 [331] [0] *** Timeout while processing Host: "NGINX" Service: "TCP_Connections"
2014-10-08 17:13:29 [331] [0] *** process_perfdata.pl terminated on signal ALRM
解决方法：
修改process_perfdata.cfg 文件
vi /usr/local/pnp4nagios/etc/process_perfdata.cfg
change：
# process_perfdata.pl timeout in seconds
#
TIMEOUT = 15
to：
# process_perfdata.pl timeout in seconds
#
TIMEOUT = 30