创建用户：
use mysql;
grant all privileges on *.* to 'zabbix'@'%' identified by 'zabbixpasswd';
grant all privileges on *.* to 'zabbix'@'localhost' identified by 'zabbixpasswd';
flush privileges;
修改 /etc/zabbix/zabbix_agentd.conf
Include=/etc/zabbix/zabbix_agentd.d/*.conf
vim /etc/zabbix/zabbix_agentd.d/userparameter_mysql.conf
UserParameter=mysql.alive,/usr/local/mysql/bin/mysqladmin ping 2>/dev/null |grep -c "alive"
UserParameter=mysql.processlist_count,/usr/local/mysql/bin/mysql -e "select count(*) from information_schema.processlist where command !='Sleep' " |grep -v "count"
UserParameter=mysql.Slave_IO_Running,/usr/local/mysql/bin/mysql -e "show slave statusG"|grep Slave_IO_Running|grep -c "Yes"
UserParameter=mysql.Slave_SQL_Running,/usr/local/mysql/bin/mysql -e "show slave statusG"|grep Slave_SQL_Running|grep -c "Yes"
UserParameter=mysql.Seconds_Behind_Master,/usr/local/mysql/bin/mysql -e "show slave statusG"|grep Seconds_Behind_Master |awk '{print $2}'
UserParameter=mysql.innodb_lock,/usr/local/mysql/bin/mysql -e "SELECT count(*) FROM information_schema.INNODB_LOCK_WAITS w INNER JOIN information_schema.INNODB_TRX b ON b.trx_id= w.blocking_trx_id INNER JOIN information_schema.INNODB_TRX r ON r.trx_id= w.requesting_trx_id "|grep -v "count"
手工添加监控项和触发器。
监控项的键值就是 userparameter_mysql.conf 文件中 等号右边第一个值，比如 mysql.processlist_count
添加触发器时，添加的表达式就是来自上述添加的监控项。
注意N值来源，先运行一下监控项的返回值，比如 mysql -e "select count(*) from information_schema.processlist where command !='Sleep' " |grep -v "count"
添加触发器时，添加的表达式就是来自上述添加的监控项。
注意N值来源，先运行一下监控项的返回值，比如 mysqladmin extended-status|grep Threads_connected |awk '{print $4}'
关于触发器的设置，可参考官方文档：https://www.zabbix.com/documentation/3.4/zh/manual/config/triggers
修改 /etc/my.cnf
user=zabbix
password=zabbixpasswd
[client]
user=zabbix
password=zabbixpasswd
[mysqladmin]
user=zabbix
password=zabbixpasswd
重启 agent
systemctl restart zabbix-agent
验证
zabbix_get -s 192.168.16.16 -k "mysql.processlist_count"