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nagios教程17-nagios 监控mysql脚本例子

发布:小小编辑2016-3-4 15:03分类: nagios教程 标签: nagios教程

一、监控本地(localhost)内存

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

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

2、修改commands配置

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

5、check_mem 脚本

#!/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

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

2、修改nrpe.cfg

# 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

# 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

# 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

# visudo #Defaults    requiretty

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

#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

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

4、建立专用数据库

# 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

# /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

# 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

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

7、监控客户端

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

(2)客户端修改 nrpe.cfg

# 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

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

(4)服务端定义服务

# 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  }
# service nagios restart
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