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

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

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

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

SELECT t.* FROM triggers t WHERE t.triggerid=13073;

根据triggerid查找hosts

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

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

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-xxxxxx' and t.description='Processor load is too high on {HOST.NAME}' order by t.triggerid desc;