求助：CentOS6.2 安装nagios3.3.1所遇问题

还不算晕

CentOS6.2 安装nagios3.3.1所遇问题，编译安装过程未出错，重启nagios服务时提示：
[root@CentOS6 ~]# service nagios restart
Running configuration check...done.
Stopping nagios: No lock file found in /usr/local/nagios//var/nagios.lock
Starting nagios: done.

可以正常WEB登陆。再次重启 和停止显示如下： 请教 /usr/local/nagios//var/nagios.lock 是什么文件？  

[root@CentOS6 ~]# service nagios restart
Running configuration check...done.
Stopping nagios: ..........
Warning - nagios did not exit in a timely manner
Starting nagios: done.
[root@CentOS6 ~]# service nagios stop
Stopping nagios: No lock file found in /usr/local/nagios//var/nagios.lock

z2344683

看一下nagios的error日志，里面应该有说明。