Zabbix触发器源代码分析
Zabbix的trigger就是用来设置监控报警条件的，如果监控项目是基于模板的，那么直接在创建模板的时候设置相应item的trigger即可，如果监控项目不是基于模板的而是单独添加的，那么对于多台服务器添加相应的trigger就得使用程序处理了。创建trigger相关的源代码
frontends/php/include/triggers.inc.php
frontends/php/triggers.php
triggers表用于记录每个trigger的详细信息
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mysql> desc triggers;
+-------------+---------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------------+---------------------+------+-----+---------+-------+
| triggerid | bigint(20) unsigned | NO | PRI | NULL | |
| expression| varchar(2048) | NO | | | |
| description | varchar(255) | NO | | | |
| url | varchar(255) | NO | | | |
| status | int(11) | NO | MUL | 0 | |
| value | int(11) | NO | MUL | 0 | |
| priority | int(11) | NO | | 0 | |
| lastchange| int(11) | NO | | 0 | |
| comments | text | NO | | NULL | |
| error | varchar(128) | NO | | | |
| templateid| bigint(20) unsigned | YES| MUL | NULL | |
| type | int(11) | NO | | 0 | |
| state | int(11) | NO | | 0 | |
| flags | int(11) | NO | | 0 | |
+-------------+---------------------+------+-----+---------+-------+
14 rows in set (0.12 sec)
functions表记录每个trigger相关的函数
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mysql> desc functions;
+------------+---------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+------------+---------------------+------+-----+---------+-------+
| functionid | bigint(20) unsigned | NO | PRI | NULL | |
| itemid | bigint(20) unsigned | NO | MUL | NULL | |
| triggerid| bigint(20) unsigned | NO | MUL | NULL | |
| function | varchar(12) | NO | | | |
| parameter| varchar(255) | NO | | 0 | |
+------------+---------------------+------+-----+---------+-------+
5 rows in set (0.00 sec)
trigger_depends表记录不同trigger的依赖关系
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mysql> desc trigger_depends;
+----------------+---------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+----------------+---------------------+------+-----+---------+-------+
| triggerdepid | bigint(20) unsigned | NO | PRI | NULL | |
| triggerid_down | bigint(20) unsigned | NO | MUL | NULL | |
| triggerid_up | bigint(20) unsigned | NO | MUL | NULL | |
+----------------+---------------------+------+-----+---------+-------+
3 rows in set (0.01 sec)
triggers表通过triggerid与functions表关联，functions表通过itemid与items表关联，而items表可以通过hostid与hosts表关联
根据triggerid查找trigger信息
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SELECT t.* FROM triggers t WHERE t.triggerid=13073;
根据triggerid查找hosts
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select distinct h.* from hosts h,functions f,items i where i.itemid=f.itemid and h.hostid=i.hostid and triggerid=13073\G
根据hostid查找所有的triggers
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select distinct t.* from triggers t,functions f,items i where f.itemid=i.itemid and f.triggerid=t.triggerid and i.hostid=10309;
根据trigger描述和host名称获取所有的triggers
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select t.* from triggers t,functions f,items i ,hosts h where i.hostid=h.hostid and f.itemid=i.itemid and t.triggerid=f.triggerid and h.host='tw-newssc-prod-dbslave12' and t.description='Processor load is too high on {HOST.NAME}' order by t.triggerid desc;
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