check_mysql_health

wget http://labs.consol.de/wp-content/uploads/2011/08/check_mysql_health-2.1.7.tar.gz

wget http://labs.consol.de/wp-content/uploads/2010/03/check_mysql_health-2.1.1.tar.gz  

wget http://www.shinguz.ch/MySQL/nagios-mysql-plugins-0.3.tar.gz

1、check_mysql_health安装

在监控服务器上安装

# cd /usr/local/src/tarbag  

# wget http://labs.consol.de/wp-content/uploads/2010/03/check_mysql_health-2.1.1.tar.gz  

64位centos安装check_mysql_health插件，需要以下2个包支持

yum install -y perl-DBD-MySQL

yum install -y perl-DBD-Pg

# tar zxvf check_mysql_health-2.1.1.tar.gz -C ../software/  

./configure --prefix=/usr/local/nagios

make

make install

2、查看check_mysql_health选项

cd /usr/local/nagios/libexec

chmod 777 check_mysql_health

./check_mysql_health

Options:  
�Chostname  
the database server’s hostname  
�Cport  
the database’s port. (default: 3306)  
�Csocket  
the database’s unix socket.  
�Cusername  
the mysql db user  
�Cpassword  
the mysql db user’s password  
�Cdatabase  
the database’s name. (default: information_schema)  
�Cwarning  
the warning range  
�Ccritical  
the critical range  
�Cmode  
the mode of the plugin. select one of the following keywords:  
connection-time 连接到服务器上的时间  
uptime 服务器运行的时间  
threads-connected 当前连接到数据库的连接数  
threadcache-hitrate 线程缓存命中率  
slave-lag slave落后master多少时间  
slave-io-running slave复制是否正常  
slave-sql-running slave复制是否正常  
qcache-hitrate 查询缓存命中率   //这个命中率越高，表明服务器的select查询性能越好。
qcache-lowmem-prunes (Query cache entries pruned because of low memory：由于内存较小从缓存中删除的查询量)  // 增大query_cache_size的值，以减小lowmem，增加缓存命中率。
keycache-hitrate (MyISAM key cache hitrate ：key缓存命中率)如果命中率过低，则调大key_buffer_size  
bufferpool-hitrate (InnoDB buffer pool hitrate：innodb缓冲池命中率)  
bufferpool-wait-free (InnoDB buffer pool waits for clean page available：innodb的缓存池等等清理页。)  
log-waits (InnoDB log waits because of a too small log buffer：因为太小log缓冲区导致innodb log等待。)  
tablecache-hitrate 表缓存命中率  
table-lock-contention 表锁率
    table_locks_waited;不能立即获得的表的锁表次数。
    table_locak_waited;立即获得的表的锁表次数。
    小于1%较优，如果1%需要引起注意，大于3%性能有问题。  
index-usage 索引使用情况  
tmp-disk-tables (Percent of temp tables created on disk：建立的临时表)  
slow-queries 慢查询  
long-running-procs 长时间运行的进程  
cluster-ndbd-running ndb节点运行状况  
sql 返回一个数字的任何SQL语句

3、check_mysql_health监控配置

监控服务器：192.168.10.107

MySQL数据授权：

在被监控的MySQL数据库服务器上

mysql> grant usage on *.* to [email protected] identified by "123456";（注意ip为监控端的ip）  

mysql> grant usage on *.* to [email protected] identified by "123456";

mysql> flush privileges;  

在监控服务器上

1》查看当前连接到数据库的连接数

cd /usr/local/nagios/libexec

./check_mysql_health -hostname 127.0.0.1 -username root -password 123456 -mode threads-connected

OK �C 2 client connection threads | threads_connected=2;10;20  

threads_connected=3;10;20  

3表示连接数

10 表示warning阀值(默认)

20 表示critical阀值(默认)

―――――――――――――――――――�C

nagios-mysql-plugins插件监控数据库(插件见附件)

插件内容

check_db_mysql.pl 检测mysql是否运行

check_errorlog_mysql.pl 检测mysql数据库错误日志

check_repl_mysql_cnt_slave_hosts.pl 统计连接到从主机数

check_repl_mysql_heartbeat.pl 检测心跳 (安装完默认名字是check_repl_mysql_hearbeat.pl)

check_repl_mysql_io_thread.pl 检测IO线程

check_repl_mysql_read_exec_pos.pl

check_repl_mysql_readonly.pl 检测从是否设置为只读

check_repl_mysql_seconds_behind_master.pl检测从多少时间与主同步

check_repl_mysql_sql_thread.pl 检测SQL线程

perf_mysql.pl 收集性能数据

perf_mysql.pl -m  选项

connections,
thread_cache,
network_traffic,
queries,query_cache,
myisam_key_buffer,
table_cache,
temporary_tables,
tables,
slow_queries,
bin_log,uptime,
innodb_buffer_pool,
innodb_buffer_pool_io,
innodb_io,innodb_data,
innodb_logfile,
innodb_row_locking,
innodb_queries

./perf_mysql.pl -m connections

./perf_mysql.pl -m myisam_key_buffer

++++++++++++++++++++++++++++++++++++++

�C查看当前连接到数据库的连接数：

[root@localhost mysql]# /usr/local/nagios/libexec/check_mysql_health --hostname IP --port 3306 --username "USER" --password "PASSWORD" --mode threads-connected                        

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

如果此处报错:

CRITICAL - cannot connect to information_schema. Can't locate DBI.pm in @INC (@INC contains: /usr/local/nagios/libexec /usr/lib/perl5/site_perl/5.8.8/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.8 /usr/lib/perl5/site_perl /usr/lib/perl5/vendor_perl/5.8.8/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.8 /usr/lib/perl5/vendor_perl /usr/lib/perl5/5.8.8/i386-linux-thread-multi /usr/lib/perl5/5.8.8 .)

或者当出现Can't locate DBI.pm的错误时

安装dbd-mysql：

yum install perl-DBD-MySQL perl-DBI

===============

注意：阀值设置

-w 1-c 2

-w 1: -c 2:  （有的需要在阀值后加冒号）