静怡家园

查看cacti的日志：
Log File [Total Lines: 14 - All Items Shown]
09/18/2012 09:50:49 AM - AUTH LOGIN: User 'admin' Authenticated
09/18/2012 09:50:16 AM - MANAGE: Poller[0] Checking Manage
09/18/2012 09:50:06 AM - SYSTEM SYSLOG STATS:Time:0.28 Deletes:0 Incoming:0 Removes:0 XFers:39 Alerts:0 Alarms:0 Reports:0
09/18/2012 09:50:06 AM - SYSTEM THOLD STATS: Time:0.0172 Tholds:0 DownHosts:0
09/18/2012 09:50:06 AM - SYSTEM STATS: Time:-28796.2396 Method:spine Processes:1 Threads:1 Hosts:2 HostsPerProcess:2 DataSources:15 RRDsProcessed:15
09/18/2012 05:45:16 PM - MANAGE: Poller[0] Checking Manage
09/18/2012 05:45:10 PM - RECACHE STATS: RecacheTime:4.3342 HostsRecached:1
09/18/2012 05:45:06 PM - SYSTEM SYSLOG STATS:Time:0.55 Deletes:0 Incoming:0 Removes:0 XFers:30 Alerts:0 Alarms:0 Reports:0
09/18/2012 05:45:06 PM - PCOMMAND: Poller[0] Host[1] WARNING: Recache Event Detected for Host
09/18/2012 05:45:05 PM - SYSTEM THOLD STATS: Time:0.0343 Tholds:0 DownHosts:0
09/18/2012 05:45:05 PM - SYSTEM STATS: Time:2.6126 Method:spine Processes:1 Threads:1 Hosts:2 HostsPerProcess:2 DataSources:15 RRDsProcessed:15
09/18/2012 05:45:02 PM - POLLER: Poller[0] WARNING: Cron is out of sync with the Poller Interval! The Poller Interval is '300' seconds, with a maximum of a '300' second Cron, but 1296601 seconds have passed since the last poll!

可以看出刚开始时间是下午5:45，最后又变成早上9:50，时间是先超前最后又变成正确的了（这是由于系统每过10分钟会和时间服务器同步一次时间）。
这样会导致数据库记录poller的执行时间出问题：
mysql> select * from poller_time
    -> ;
+----+------+-----------+---------------------+---------------------+
| id | pid  | poller_id | start_time          | end_time            |
+----+------+-----------+---------------------+---------------------+
|  1 | 2231 |         0 | 2012-09-18 17:50:03 | 2012-09-18 09:50:05 |
+----+------+-----------+---------------------+---------------------+
1 row in set (0.00 sec)

mysql>
可以看出poller的执行结束时间end_time比开始时间start_time更早，这样会导致poller进程停止工作，直到系统时间超过了start_time，poller进程才回开始工作，图像才能出来！这里要特别说明下：不能简单地修改数据库poller_time表里的时间，因为数据库里面还有好多表也记录了采集各种数据的时间。
所以解决办法有两个：
1 等系统时间超过start_time（过了下午5点50），一切恢复正常（如果你有耐心 ）。
2 如果现在系统的时间不正确先把系统时间修改正确，然后删除/var/www/html/rra/下面的所有文件，最后强制执行poller程序重新生成/var/www/html/rra/下面的所有文件。操作过程如下:
# rm -rf /var/www/html/rra/*
# /usr/bin/php /var/www/html/poller.php --force
Manage : initializing...
Checking Manage... TCP :
      Data Source : 9 is : 1
Checking Manage... TCP :
      Data Source : 8 is : 1
OK u:0.00 s:0.01 r:1.87
OK u:0.00 s:0.01 r:1.87
OK u:0.00 s:0.02 r:1.88
OK u:0.00 s:0.02 r:1.88
OK u:0.00 s:0.02 r:1.90
OK u:0.00 s:0.02 r:1.90
OK u:0.00 s:0.02 r:1.91
OK u:0.00 s:0.02 r:1.91
OK u:0.00 s:0.02 r:1.92
OK u:0.00 s:0.02 r:1.92
OK u:0.00 s:0.02 r:1.93
OK u:0.00 s:0.02 r:1.93
OK u:0.00 s:0.02 r:1.95
OK u:0.00 s:0.02 r:1.95
OK u:0.00 s:0.02 r:1.96
OK u:0.00 s:0.02 r:1.96
OK u:0.00 s:0.02 r:1.97
OK u:0.00 s:0.02 r:1.97
OK u:0.00 s:0.02 r:1.98
OK u:0.00 s:0.02 r:1.98
OK u:0.00 s:0.02 r:1.99
OK u:0.00 s:0.02 r:1.99
OK u:0.00 s:0.03 r:2.00
OK u:0.00 s:0.03 r:2.01
OK u:0.00 s:0.03 r:2.02
OK u:0.00 s:0.03 r:2.02
OK u:0.00 s:0.03 r:2.03
OK u:0.00 s:0.03 r:2.03
OK u:0.00 s:0.03 r:2.05
OK u:0.00 s:0.03 r:2.05
09/18/2012 11:38:00 AM - SYSTEM STATS: Time:2.2115 Method:spine Processes:1 Threads:1 Hosts:2 HostsPerProcess:2 DataSources:15 RRDsProcessed:15
#
注意一定要先删除/var/www/html/rra/下的所有文件在执行/usr/bin/php /var/www/html/poller.php --force，过一会看看是不是出图了。