nagios监控mysql（check_mysql）及内存使用率（check_mem）

4rwer2

一、监控本地（localhost）内存

1、上传监控脚本 check_mem 到/usr/local/nagios/libexec

1 2	# chown -R nagios.nagios check_mem # chmod +x check_mem

2、修改commands配置

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# vim /usr/local/nagios/etc/objects/commands.cfg define command{         command_name        check_mem         command_line        $USER1$/check_mem -w $ARG1$ -c $ARG2$         }

3、修改localhost.cfg

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# vim /usr/local/nagios/etc/objects/localhost.cfg define service{         use                             local-service         host_name                       localhost         service_description             check_mem         check_command                   check_mem!20!10         }

4、重启nagios服务

1	# service nagios restart

5、check_mem 脚本

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#!/bin/bash   USAGE="`basename $0` [-w|--warning]<percent free> [-c|--critical]<percent free>" THRESHOLD_USAGE="WARNING threshold must be greater than CRITICAL: `basename $0` $*" calc=/tmp/memcalc percent_free=/tmp/mempercent critical="" warning="" STATE_OK=0 STATE_WARNING=1 STATE_CRITICAL=2 STATE_UNKNOWN=3 # print usage   if [[ $# -lt 4 ]] then         echo ""           echo "Wrong Syntax: `basename $0` $*"           echo ""           echo "Usage: $USAGE"           echo ""           exit 0 fi # read input   while [[ $# -gt 0 ]]     do         case "$1" in                -w|--warning)                shift                warning=$1         ;;                -c|--critical)                shift                critical=$1         ;;         esac         shift   done # verify input   if [[ $warning -eq $critical || $warning -lt $critical ]] then         echo ""           echo "$THRESHOLD_USAGE"           echo ""           echo "Usage: $USAGE"           echo ""           exit 0 fi # Total memory available   total=`free -m | head -2 |tail -1 |gawk '{print $2}'` # Total memory used   used=`free -m | head -2 |tail -1 |gawk '{print $3}'` # Calc total minus used   free=`free -m | head -2 |tail -1 |gawk '{print $2-$3}'` # normal values   #echo "$total"MB total   #echo "$used"MB used   #echo "$free"MB free   # make it into % percent free = ((free mem / total mem) * 100)   echo "5" > $calc # decimal accuracy   echo "k" >> $calc # commit   echo "100" >> $calc # multiply   echo "$free" >> $calc # division integer   echo "$total" >> $calc # division integer   echo "/" >> $calc # division sign   echo "*" >> $calc # multiplication sign   echo "p" >> $calc # print   percent=`/usr/bin/dc $calc|/bin/sed 's/^\./0./'|/usr/bin/tr "." " "|/usr/bin/gawk {'print $1'}` #percent1=`/usr/bin/dc $calc`   #echo "$percent1"   if [[ "$percent" -le  $critical ]]         then                 echo "CRITICAL - $free MB ($percent%) Free Memory"                   exit 2 fi if [[ "$percent" -le  $warning ]]         then                 echo "WARNING - $free MB ($percent%) Free Memory"                   exit 1 fi if [[ "$percent" -gt  $warning ]]         then                 echo "OK - $free MB ($percent%) Free Memory"                   exit 0 fi

二、监控客户端内存使用情况

1、上传监控脚本 check_mem 到/usr/local/nagios/libexec

1 2	# chown -R nagios.nagios check_mem # chmod +x check_mem

2、修改nrpe.cfg

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# vim /usr/local/nagios/etc/nrpe.cfg command[check_users]=/usr/local/nagios/libexec/check_users -w 3 -c 5 command[check_load]=/usr/local/nagios/libexec/check_load -w 15,10,5 -c 30,25,20 command[check_xvda]=/usr/local/nagios/libexec/check_disk -w 10% -c 5% -p /dev/xvda command[check_zombie_procs]=/usr/local/nagios/libexec/check_procs -w 5 -c 10 -s Z command[check_total_procs]=/usr/local/nagios/libexec/check_procs -w 150 -c 200 command[check_xvdb2]=/usr/local/nagios/libexec/check_disk -w 10% -c 5% -p /dev/xvdb2 command[check_swap]=/usr/local/nagios/libexec/check_swap -w 20% -c 10% command[check_mem]=/usr/bin/sudo /usr/local/nagios/libexec/check_mem -w 20 -c 10   #增加此行

3、在nagios服务器端增加监控服务

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# vim /usr/local/nagios/etc/servers/192.168.200.111.cfg define service{         use                             generic-service         host_name                       192.168.200.111         service_description             check_mem         check_command                   check_nrpe!check_mem         }

三、排错

1、NRPE: Unable to read output
（1）为nagios用户增加sudo权限

1 2	# visudo nagios  ALL=(ALL) NOPASSWD:/usr/local/nagios/libexec/check_mem

（2）注释掉一下行，表示不需要控制终端

1 2	# visudo #Defaults    requiretty

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四、nagios监控mysql
1、check_mysql
    nagios监控mysql使用的是 check_mysql 这个插件，需要在nagios服务器上先安装mysql-devel，然后再重新安装nagios-plugin，这样才会出现check_mysql。否则即使copy了一份，也照样用不了。
2、编译或重新编译 nagios-plugin

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#yum -y install mysql-devl #cd nagios-plugins-2.0.3 #./configure --with-nagios-user=nagios --with-nagios-group=nagios #make && make install

3、查看 check_mysql

1	# ls /usr/local/nagios/libexec/check_mysql

4、建立专用数据库

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# mysql -uroot -p mysql> create database nagios_monitor; mysql> grant select on nagios_monitor.* to nagios@'%' identified by '123qaz!@#'; Query OK, 0 rows affected (0.00 sec) mysql> flush privileges; Query OK, 0 rows affected (0.00 sec) mysql> select User,Password,Host from mysql.user; +--------+-------------------------------------------+--------------+ | User   | Password                                  | Host         | +--------+-------------------------------------------+--------------+ | root   | *B9627CB37815863D1E98D0C41E0233A772355E2B | localhost    | | root   | *B9627CB37815863D1E98D0C41E0233A772355E2B | 127.0.0.1    | | root   | *B9627CB37815863D1E98D0C41E0233A772355E2B | ::1          | | cacti  | *BC3E1F14C7940F9C8BCDB05A38385754BB55CD64 | localhost    | | nagios | *BC3E1F14C7940F9C8BCDB05A38385754BB55CD64 | %            | +--------+-------------------------------------------+--------------+ 8 rows in set (0.00 sec)

5、check 一下

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# /usr/local/nagios/libexec/check_mysql -H 192.168.200.105 -unagios -dnagios_monitor -p 123qaz!@# # 报了一个错 /usr/local/nagios/libexec/check_mysql: error while loading shared libraries: libmysqlclient.so.18: cannot open shared object file: No such file or directory # 解决： ln -sv /usr/local/mysql/lib/libmysqlclient.so.18 /usr/lib64/libmysqlclient.so.18 # 再重新测试 # /usr/local/nagios/libexec/check_mysql -H 192.168.200.111 -unagios -dnagios_monitor -p 123qaz!@# Uptime: 13991  Threads: 5  Questions: 1242101  Slow queries: 0  Opens: 159  Flush tables: 1  Open tables: 60  Queries per second avg: 88.778|Connections=315c;;; Open_files=85;;; Open_tables=60;;; Qcache_free_memory=16285768;;; Qcache_hits=1210926c;;; Qcache_inserts=16654c;;; Qcache_lowmem_prunes=0c;;; Qcache_not_cached=2c;;; Qcache_queries_in_cache=283;;; Queries=1242101c;;; Questions=1242101c;;; Table_locks_waited=2c;;; Threads_connected=5;;; Threads_running=1;;; Uptime=13991c;;;

6、监控localhost

（1）修改 commands.cfg

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# vim /usr/local/nagios/etc/objects/commands.cfg define command{         command_name check_mysql         command_line $USER1$/check_mysql -H $HOSTADDRESS$ -unagios -dnagios_monitor -p123qaz!@# }

（2）修改 localhost.cfg

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# vim /usr/local/nagios/etc/objects/localhost.cfg define service{         use                             local-service         host_name                       localhost         service_description             check_mysql         check_command                   check_mysql         }

（3）重启 nagios

1	# service nagios restart

7、监控客户端
（1）check 一下

1	# /usr/local/nagios/libexec/check_mysql -H 192.168.200.111 -unagios -dnagios_monitor -p123qaz!@#

（2）客户端修改 nrpe.cfg

1 2	# vim /usr/local/nagios/etc/nrpe.cfg command[check_mysql]=/usr/local/nagios/libexec/check_mysql -H 192.168.200.111 -unagios -dnagios_monitor -p123qaz!@#

（3）重启 nrpe

1 2	# killall nrpe # /usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d

（4）服务端定义服务

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# vim /usr/local/nagios/etc/servers/192.168.200.111.cfg define service{         use                             generic-service         host_name                       192.168.200.111         service_description             check_mysql         check_command                   check_nrpe!check_mysql         }

（5）重启 nagios 服务

1	# service nagios restart