became not supported: Not supported by Zabbix Agent

夜勿眠

　　先看具体报错zabbix_server.log

　　18425:20140418:101914.403 item [dn03:hadoop.status] became not supported: Not supported by Zabbix Agent
　　18425:20140418:101929.617 item [dn05:hadoop.status] became not supported: Not supported by Zabbix Agent
　　18416:20140418:101934.638 item [dn07:hadoop.status] became not supported: Not supported by Zabbix Agent
　　18425:20140418:102125.992 item [dn04:hadoop.status] became supported
　　18418:20140418:102131.103 item [dn05:hadoop.status] became supported
　　18418:20140418:102131.103 item [dn10:hadoop.status] became supported
　　18416:20140418:102136.126 item [dn11:hadoop.status] became supported
　　18416:20140418:102136.126 item [dn12:hadoop.status] became supported
　　18416:20140418:102136.126 item [dn13:hadoop.status] became supported
　　18416:20140418:102136.127 item [dn14:hadoop.status] became supported
　　18417:20140418:102221.647 item [dn03:hadoop.status] became supported
　　18417:20140418:102302.247 item [10.10.5.87:nginx.status] became supported
　　18416:20140418:102544.641 item [10.10.5.80:nginx.LISTEN] became not supported: Not supported by Zabbix Agent
　　zabbix图形监控界面的图形显示也是时断时续的情况，一般晚上下班后到第二天早上上班前，监控显示的会比较全，如图

　　

　　这个问题困扰了我2天，删除监控项目再新建，还是不行，在网上也找不到相关的问题，后来想起以前曾出现这样的问题，
　　18398:20140418:135449.492 Zabbix agent item [net.if.in[eth2]] on host [10.10.5.80] failed: first network error, wait for 15 seconds
　　18404:20140418:135504.937 Zabbix agent item [net.if.in[eth2]] on host [10.10.5.80] failed: another network error, wait for 15 seconds
　　18404:20140418:135519.939 Zabbix agent item [vfs.fs.inode[/boot,pfree]] on host [10.10.5.80] failed: another network error, wait for 15 seconds
　　18404:20140418:135534.942 Zabbix agent item [vfs.fs.size[/,free]] on host [10.10.5.80] failed: another network error, wait for 15 seconds
　　18404:20140418:135549.975 temporarily disabling Zabbix agent checks on host [10.10.5.80]: host unavailable
　　网上说增加zabbix_agentd.conf配置文件的Timeout值，我改为了20，默认是3.
　　由于我新加的几台机器没改这个值，所以就出现了如上的时断时续的情况，当我改了Timeout值后
　　马上not supported by zabbix agent就变为了become supported。
　　通过上面的情况可以看出默认的Timeout值太小了，通过增大这个值，似乎问题都迎刃而解了。
　　我想以后应该不会再出现同样的问题了。