Nagios监控mysql服务器详细实现过程_MySQL

1、NRPE介绍

NRPE是Nagios的一个功能扩展，它可在远程Linux/Unix主机上执行插件程序。通过在远程服务器上安装NRPE插件及Nagios插件程序来向Nagios监控平台提供该服务器的本地情况，如CPU负载，内存使用，磁盘使用等。这里将Nagios监控端称为Nagios服务器端，而将远程被监控的主机称为Nagios客户端。

Nagios监控远程主机的方法有多种，其方式包括SNMP，NRPE,SSH,NCSA等。这里介绍其通过NRPE监控远程Linux主机的方式。

NRPE（Nagios Remote Plugin Executor）是用于在远端服务器上运行监测命令的守护进程，它用于让Nagios监控端基于安装的方式触发远端主机上的检测命令，并将检测结果返回给监控端。而其执行的开销远低于基于SSH的检测方式，而且检测过程不需要远程主机上的系统账号信息，其安全性也高于SSH的检测方式。

2、NRPE的工作原理

NRPE有两部分组成

check_nrpe插件：位于监控主机上

nrpe daemon：运行在远程主机上，通常是被监控端agent

注意：nrpe daemon需要Nagios-plugins插件的支持，否则daemon不能做任何监控

当Nagios需要监控某个远程Linux主机的服务或者资源情况时：

首先：Nagios会运行check_nrpe这个插件，告诉它要检查什么；

其次：check_nrpe插件会连接到远程的NRPE daemon，所用的方式是SSL；

然后：NRPE daemon 会运行相应的Nagios插件来执行检查；

最后：NRPE daemon 将检查的结果返回给check_nrpe 插件，插件将其递交给nagios做处理。

原博客地址： http://blog.csdn.net/mchdba/article/details/46666229
原作者：黄杉 (mchdba)

3、被监控端安装Nagios-plugins插件和NRPE

去mysql客户端安装nrpe客户端服务

3.1、添加nagios用户

[root@localhost ~]# useradd -s/sbin/nologin nagios

3.2，安装nagios插件

[root@localhost ~]# yum -yinstall gcc gcc-c++ make openssl openssl-devel

3.3，安装nrpe

tar -xvf nrpe-2.15.tar.gz

cd nrpe-2.15

./configure--with-nrpe-user=nagios --with-nrpe-group=nagios --with-nagios-user=nagios--with-nagios-group=nagios --enable-command-args --enable-ssl

make all

make install-plugin

make install-daemon

make install-daemon-config

3.4，去检查nrpe配置

grep -v '^#' /usr/local/nagios/etc/nrpe.cfg |sed '/^$/d'

[root@localhost ~]# grep -v '^#' /usr/local/nagios/etc/nrpe.cfg|sed '/^$/d'

log_facility=daemon

pid_file=/var/run/nrpe.pid

server_port=5666

nrpe_user=nagios

nrpe_group=nagios

allowed_hosts=127.0.0.1,192.168.121.211

dont_blame_nrpe=0

allow_bash_command_substitution=0

debug=0

command_timeout=60

connection_timeout=300

command[check_users]=/usr/local/nagios/libexec/check_users-w 8 -c 12

command[check_load]=/usr/local/nagios/libexec/check_load -w15,10,5 -c 30,25,20

command[check_sda1]=/usr/local/nagios/libexec/check_disk -w20% -c 10% -p /dev/sda3

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 750 -c 800

command[check-host-alive]=/usr/local/nagios/libexec/check_ping-H 10.254.3.72 -w 3000.0,80% -c 5000.0,100% -p 5

command[check_mysql_status]=/usr/local/nagios/libexec/check_mysql-unagios -P3306 -s /usr/local/mysql/mysql.sock -Hlocalhost--password='nagiosq@0625' -d test -w 60 -c 100

[root@localhost ~]#

3.5，启动nrpe

/usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe

4，制作启动脚本：

[root@localhost bin]# cat /etc/init.d/nrped

#chkconfig: 2345 80 90

#description:auto_run

NRPE=/usr/local/nagios/bin/nrpe

NRPECONF=/usr/local/nagios/etc/nrpe.cfg

case "$1" in

start)

echo -n "Starting NRPE daemon..."

$NRPE -c $NRPECONF -d

echo " done."

;;

stop)

echo -n "Stopping NRPE daemon..."

pkill -u nagios nrpe

echo " done."

;;

restart)

$0 stop

sleep 2

$0 start

;;

*)

echo "Usage: $0 start|stop|restart"

;;

esac

exit 0

[root@localhost bin]#

5，设置启动

chmod +x /etc/init.d/nrped

chkconfig --add nrped

chkconfig nrped on

[root@localhost bin]# ps -eaf|grep nrpe

nagios 30440 1 0 23:48 ? 00:00:00 /usr/local/nagios/bin/nrpe -c/usr/local/nagios/etc/nrpe.cfg -d

root 30442 3292 0 23:48 pts/0 00:00:00 grep nrpe

[root@localhost bin]#

[root@localhost bin]# netstat -tnlp |grepnrpe

tcp 0 0 0.0.0.0:5666 0.0.0.0:* LISTEN 30440/nrpe

tcp 0 0 :::5666 :::* LISTEN 30440/nrpe

[root@localhost bin]#

6，监控端安装nrpe

tar xf nrpe-2.15.tar.gz

cd nrpe-2.15

./configure --with-nrpe-user=nagios --with-nrpe-group=nagios --with-nagios-user=nagios --with-nagios-group=nagios --enable-command-args --enable-ssl

make all

make install-plugin

#安装完成后，会在Nagios安装目录的libexec下生成check_nrpe的插件，如下所示：

[root@test_db2 nagios]# ll /usr/local/nagios/libexec/check_nrpe

-rwxrwxr-x 1 nagios nagios 76777 Jun 2523:53 /usr/local/nagios/libexec/check_nrpe

[root@test_db2 nagios]#

检测报错：

[root@test_db2 libexec]# ./check_nrpe -H192.168.121.210

CHECK_NRPE: Error - Could not complete SSLhandshake.

[root@test_db2 libexec]#

去客户端在allowed_hosts中添加监控端IP地址

[root@localhost ~]# vim/usr/local/nagios/etc/nrpe.cfg

allowed_hosts=127.0.0.1,192.168.121.211

在mysql服务器上，报错：

[root@localhost ~]#/usr/local/nagios/libexec/check_mysql -unagios -P3306 -S -s/usr/local/mysql/mysql.sock -Hlocalhost --password='nagiosq@0512' -d test -w 60-c 100

/usr/local/nagios/libexec/check_mysql:error while loading shared libraries: libmysqlclient.so.18: cannot open sharedobject file: No such file or directory

[root@localhost ~]#

[root@localhost ~]# find / -namelibmysqlclient.so.18

/usr/local/mysql/lib/libmysqlclient.so.18

/root/mysql/mysql-5.6.12/libmysql/libmysqlclient.so.18

/root/mysql-5.6.12/libmysql/libmysqlclient.so.18

[root@localhost ~]# ln -s/usr/local/mysql/lib/libmysqlclient.so.18 /usr/lib64/libmysqlclient.so.18

[root@localhost ~]#

添加mysql账号：

mysql> GRANT PROCESS, SUPER, REPLICATIONCLIENT ON *.* TO 'nagios'@'localhost' IDENTIFIED BY 'nagiosq@0625';

Query OK, 0 rows affected (0.05 sec)

mysql>

客户端自己检测：

[root@localhost ~]#/usr/local/nagios/libexec/check_mysql -unagios -P3306 -s /usr/local/mysql/mysql.sock -Hlocalhost--password='nagiosq@0625' -d test -w 60 -c 100

Uptime: 1823238 Threads: 6 Questions: 684495 Slow queries:0 Opens: 124 Flush tables: 1 Open tables: 116 Queries per second avg:0.375|Connections=3116c;;; Open_files=19;;; Open_tables=116;;; Qcache_free_memory=61538880;;;Qcache_hits=176271c;;; Qcache_inserts=41370c;;; Qcache_lowmem_prunes=0c;;;Qcache_not_cached=331835c;;; Qcache_queries_in_cache=3373;;; Queries=684496c;;;Questions=681384c;;; Table_locks_waited=0c;;; Threads_connected=5;;;Threads_running=2;;; Uptime=1823238c;;;

[root@localhost ~]#

7，完善配置文件

7.1在command.cfg里面添加监控command命令

将servers.cfg添加进nagios.cfg里面，将command.cfg里面的check_host_alive以及check_mysql_status补充好，然后重启nagios

# add by timman on 20150512

define command{

command_name check_mysql_status

command_line $USER1$/check_mysql_status-w $ARG1$ -c $ARG2$

}

# 'check_nrpe' command definition,add bytimman on 20140508

define command{

command_name check_nrpe

command_line $USER1$/check_nrpe-H $HOSTADDRESS$ -c $ARG1$

}

define command{

command_name check_host_alive

command_line $USER1$/check_ping-H $HOSTADDRESS$ -w 3000.0,80% -c 5000.0,100% -p 5

}

7.2在servers.cfg里面添加check_mysql_status、 check_host_alive等服务监控项。

[root@test_db2 etc]# more servers.cfg

# servicedefinition

define service{

host_name cactitest

service_description check_load

check_command check_nrpe!check_load

max_check_attempts 5

normal_check_interval 3

retry_check_interval 2

check_period 24x7

notification_interval 10

notification_period 24x7

notification_options w,u,c,r

contact_groups dba

}

define service{

host_name cactitest

service_description check_host_alive

check_command check_host_alive

max_check_attempts 5

normal_check_interval 3

retry_check_interval 2

check_period 24x7

notification_interval 10

notification_period 24x7

notification_options w,u,c,r

contact_groups dba

}

define service{

host_name cactitest

service_description Check Disksda1

check_command check_nrpe!check_sda1

max_check_attempts 5

normal_check_interval 3

retry_check_interval 2

check_period 24x7

notification_interval 10

notification_period 24x7

notification_options w,u,c,r

contact_groups dba

}

define service{

host_name cactitest

service_description TotalProcesses

check_command check_nrpe!check_total_procs

max_check_attempts 5

normal_check_interval 3

retry_check_interval 2

check_period 24x7

notification_interval 10

notification_period 24x7

notification_options w,u,c,r

contact_groups dba

}

define service{

host_name cactitest

service_description CurrentUsers

check_command check_nrpe!check_users

max_check_attempts 5

normal_check_interval 3

retry_check_interval 2

check_period 24x7

notification_interval 10

notification_period 24x7

notification_options w,u,c,r

contact_groups dba

}

define service{

host_name cactitest

service_description CheckZombie Procs

check_command check_nrpe!check_zombie_procs

max_check_attempts 5

normal_check_interval 3

retry_check_interval 2

check_period 24x7

notification_interval 10

notification_period 24x7

notification_options w,u,c,r

contact_groups dba

}

define service{

host_name cactitest

service_description CheckMysql Status

check_command check_nrpe!check_mysql_status

max_check_attempts 5

normal_check_interval 3

retry_check_interval 2

check_period 24x7

notification_interval 10

notification_period 24x7

notification_options w,u,c,r

contact_groups dba

}

7.3 在nagios.cfg加载servers.cfg等配置文件

在nagios.cfg里面配置

cfg_file=/usr/local/nagios/etc/servers.cfg

同时添加新的主机或者服务配置cfg文件，都需要在nagios.cfg里面配置一下，然后重启nagios才能生效，如下所示：

[root@test_db2 nagios]# grep -v '^#'/usr/local/nagios/etc/nagios.cfg |sed '/^$/d' |grep cfg_file

cfg_file=/usr/local/nagios/etc/objects/commands.cfg

cfg_file=/usr/local/nagios/etc/objects/contacts.cfg

cfg_file=/usr/local/nagios/etc/contactgroups.cfg

cfg_file=/usr/local/nagios/etc/objects/timeperiods.cfg

cfg_file=/usr/local/nagios/etc/objects/templates.cfg

cfg_file=/usr/local/nagios/etc/hosts.cfg

cfg_file=/usr/local/nagios/etc/servers.cfg

cfg_file=/usr/local/nagios/etc/hostgroups.cfg

cfg_file=/usr/local/nagios/etc/objects/localhost.cfg

[root@test_db2 nagios]#

8，之后在页面就可以看到监控效果了