• Nagios 监控mysqlserver具体实现过程


    1NRPE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,其方式包含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执行监測命令的守护进程,它用于让Nagios监控端基于安装的方式触发远端主机上的检測命令。并将检測结果返回给监控端。而其执行的开销远低于基于SSH的检測方式,并且检測过程不须要远程主机上的系统账号信息,其安全性也高于SSH的检測方式。

    2NRPE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:执行在远程主机上,一般是被监控端agent

    注意:nrpe daemon须要Nagios-plugins插件的支持。否则daemon不能做不论什么监控

    当Nagios须要监控某个远程Linux主机的服务或者资源情况时:

    首先:Nagios会执行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 会执行对应的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。

    <版权全部。文章同意转载,但必须以链接方式注明源地址,否则追究法律责任!> 
    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、加入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 

    #安装完毕后。会在Nagios安装文件夹的libexec下生成check_nrpe的插件。例如以下所看到的:

    [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]#

    检測报错:

    [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中加入监控端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 ~]#

    加入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>

    客户端自己检測:

    [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,完好配置文件

    7.1command.cfg里面加入监控command命令

    将servers.cfg加入进nagios.cfg里面,将command.cfg里面的check_host_alive以及check_mysql_status补充好,然后重新启动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

           }

    7.2servers.cfg里面加入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 nagios.cfg载入servers.cfg等配置文件

    在nagios.cfg里面配置

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

    同一时候加入新的主机或者服务配置cfg文件,都须要在nagios.cfg里面配置一下,然后重新启动nagios才干生效,例如以下所看到的:

    [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,之后在页面就能够看到监控效果了

     

    參考文章:http://os.51cto.com/art/201409/452605.htm

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  • 原文地址:https://www.cnblogs.com/mfrbuaa/p/5387418.html
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