MySQL监控

check_mysql_health插件比起Nagios官方的check_mysql插件功能更为强大

check_mysql_health不但能监控MySQL是否正常运行，还能监控MySQL主从、MySQL连接数情况、MySQL慢查询等多种监控指标。

1)安装check_mysql_health

apt-get install libdbd-mysql-perl libdbi-perl

tar xvzf DBI-1.618.tar.gz
cd DBI-1.618
perl Makefile.PL
make && make install

tar xvzf check_mysql_health-2.1.7tar.gz 
cd check_mysql_health-2.1.7
./configure --prefix=/usr/local/nagios/ --with-nagios-user=nagios --with-nagios-group=nagios -with-mymodules-dir=/usr/local/nagios/libexec --with-mymodules-dyn-dir=/usr/local/nagios/libexec
make
make install

2)部署Nagios上的 check_mysql_health

创建mysql用户

以root连接到服务器上后，添加新帐户。下面的语句使用GRANT来设置4个新帐户：

mysql>GRANT ALL PRIVILEGES 0N *.* TO ‘monty’@ ‘localhost’ IDENTIFIED BY ‘some_pass’ WITH GRANT OPTION;

mysql>GRANT ALL PRIVILEGES 0N *.* TO ‘monty’@ ‘%’ IDENTIFIED BY ‘some_pass’ WITH GRANT OPTION;

mysql>GRANT RELOAD,PROCESS ON *.* TO ‘admin’@ ‘localhost’;

mysql>GRANT USAGE ON *.* TO ‘dummy’@ ‘localhost’;

用GRANT语句创建 的帐户有下面的属性：

其中两个帐户有相同的用户名monty和密码some_pass，两个帐户均为超级用户帐户，具有完全的权限可以做任何事情，一个帐户（’monty’@’localhost’）只用于从本机连接时，另一个帐户（’monty’@’%’）可用于从其它主机连接。请注意monty的两个帐户必须能从任何主机以monty连接。没有localhost 帐户，当monty 从本机连接时，mysql_install_db创建的localhost的匿名用户帐户将占先。结果是，monty将被视为匿名用户。原因是匿名用户帐户的Hosting列值比’monty’@’%’帐户更具，这样在user表排序顺序中排在前面。（user表排序的计论在参考mysql手册）。

一个帐户有用户名admin，没有密码。该帐户只用于从本机连接。授予了RELOAD和PROCESS管理权限。这些权限允许admin 用户执行mysqladmin reload、mysqladmin refresh和mysqladmin flush-xxx命令，以及mysqladmin processlist。未授予访问数据库的权限。可以通过GRANT语句添加此类权限。

3)check_mysql_health插件基本用法

check_mysql_health --hostname localhost --port 3306 --username root --password 123456 --mode threads-connected

返回：

OK - 1 client connection threads | threads_connected=1;10;20

各参数具体含义

--hostname　 定义被监控主机的IP或机器名 
--port　　　 定义被监控主机上MySQL的运行端口
--username　 定义被监控主机上MySQL的用户名
--password　 定义被监控主机上MySQL的密码
--mode　　　 定义被监控主机上MySQL的监控指标

#监控MySQL主从
#mysql -u root -p
# mysql>GRANT ALL ON *.* TO root@10.0.1.180 IDENTIFIED BY '123456';
# mysql>Flush Privileges;
# mysql>exit;

4)配置commands.cfg

vi /usr/local/icinga/etc/objects/commands.cfg
define command{     
　　command_name 		check_mysql_health
　　command_line 			$USER1$/check_mysql_health --hostname $HOSTADDRESS$ --port $ARG1$ --username $ARG2$ --password $ARG3$ --mode $ARG4$
}

5)配置localhost.cfg

--mode
connection-time      	(Time to connect to the server)
uptime               	(Time the server is running)
threads-connected    	(Number of currently open connections)
threadcache-hitrate  	(Hit rate of the thread-cache)
threads-created      	(Number of threads created per sec)
threads-running      	(Number of currently running threads)
threads-cached       	(Number of currently cached threads)
connects-aborted     	(Number of aborted connections per sec)
clients-aborted      	(Number of aborted connections (because the client died) per sec)
slave-lag            	(Seconds behind master)
slave-io-running     	(Slave io running: Yes)
slave-sql-running    	(Slave sql running: Yes)
qcache-hitrate       	(Query cache hitrate)
qcache-lowmem-prunes 	(Query cache entries pruned because of low memory)
keycache-hitrate     	(MyISAM key cache hitrate)
bufferpool-hitrate   	(InnoDB buffer pool hitrate)
bufferpool-wait-free 	(InnoDB buffer pool waits for clean page available)
log-waits            	(InnoDB log waits because of a too small log buffer)
tablecache-hitrate   	(Table cache hitrate)
table-lock-contention	(Table lock contention)
index-usage          	(Usage of indices)
tmp-disk-tables      	(Percent of temp tables created on disk)
table-fragmentation  	(Show tables which should be optimized)
open-files           	(Percent of opened files)
slow-queries         	(Slow queries)
long-running-procs   	(long running processes)
cluster-ndbd-running 	(ndnd nodes are up and running)
sql                  	(any sql command returning a single number)


#connection-time##########
define service{
　　use　　　　　　　　　　local-service
　　host_name　　　　　　 localhost
　　service_description       mysql_connection_time
　　check_command          check_mysql_health!localhost!3306!root!123456!connection-time
}