Redhat如何配置nagios

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配置被监控机

本文讲述的是：Redhat配置nagios。返回大纲。

配置linux被监控机(客户端)

需要先安装gcc、openssl、openssl-devel。

先添加一个用户

[root@localhost ~]# useradd nagios   [root@localhost ~]# passwd nagios //123456

Changing password for user nagios.

New UNIX password:

BAD PASSWORD: it is too simplistic/systematic

Retype new UNIX password:

passwd: all authentication tokens updated successfully.

安装nagios-plugins-1.4.15.tar.gz

[root@localhost ~]# tar -zxvf nagios-plugins-1.4.15.tar.gz   [root@localhost ~]# cd nagios-plugins-1.4.15   [root@localhost nagios-plugins-1.4.15]# ./configure --prefix=/usr/local/nagios   [root@localhost nagios-plugins-1.4.15]# make   [root@localhost nagios-plugins-1.4.15]# make install   [root@localhost nagios-plugins-1.4.15]# chown nagios.nagios /usr/local/nagios   [root@localhost nagios-plugins-1.4.15]# chown -R nagios.nagios /usr/local/nagios/libexec

安装nrpe

[root@localhost ~]# tar -zxvf nrpe-2.8b1   [root@localhost ~]# cd nrpe-2.8b1   [root@localhost nrpe-2.8b1]# ./configure   [root@localhost nrpe-2.8b1]# make all   [root@localhost nrpe-2.8b1]# make install-plugin   [root@localhost nrpe-2.8b1]# make install-daemon   [root@localhost nrpe-2.8b1]# make install-daemon-config

编辑nrpe.cfg

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

查找如下加上nagios服务器ip地址

allowed_hosts=127.0.0.1,10.155.2.65

保存后，用如下命令启动nrpe和添加到开机启动中

/usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d   echo '/usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d &> /dev/null' >> /etc/rc.local

验证

[root@localhost etc]# /usr/local/nagios/libexec/check_nrpe -H localhost

NRPE v2.8b1

[root@localhost etc]# netstat -atulnp | grep 'nrpe'

tcp 0 0 0.0.0.0:5666 0.0.0.0:* LISTEN 24823/nrpe

如果不正常见文章***的问题和解决(1)

这里客户端的配置已经完成，已经可以到nagios服务器配置command.cfg监控，但是这里介绍另一种方法在编辑nrpe.cfg配置命令，nagios服务器会调用客户端的nrpe命令

vi /usr/local/nagios/etc/nrpe.cfg   command[check_users]=/usr/local/nagios/libexec/check_users -w 5 -c 10   command[check_load]=/usr/local/nagios/libexec/check_load -w 15,10,5 -c 30,25,20   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_swap]=/usr/local/nagios/libexec/check_swap -w 20% -c 10%

下面这条是自己添加

command[check_ping81]=/usr/local/nagios/libexec/check_ping -H 10.155.0.1 -w 100.0,20% -c 500.0,60%#   command[check_hda1]=/usr/local/nagios/libexec/check_disk -w 20 -c 10 -p /dev/hda1   #command[命令名称]=命令定义

具体使用见帮助

[root@localhost nagios]# ls   bin etc include libexec share   [root@localhost nagios]# pwd   /usr/local/nagios   [root@localhost nagios]# libexec/check_ping -h   check_ping v1.4.15 (nagios-plugins 1.4.15)   Copyright (c) 1999 Ethan Galstad   Copyright (c) 2000-2007 Nagios Plugin Development Team   Use ping to check connection statistics for a remote host.

Usage:   check_ping -H -w ,% -c ,%   [-p packets] [-t timeout] [-4|-6]   Options:   -h, --help   Print detailed help screen   -V, --version   Print version information   -4, --use-ipv4   Use IPv4 connection   -6, --use-ipv6   Use IPv6 connection   -H, --hostname=HOST  host to ping   -w, --warning=THRESHOLD  warning threshold pair   -c, --critical=THRESHOLD  critical threshold pair   -p, --packets=INTEGER  number of ICMP ECHO packets to send (Default: 5)   -L, --link   show HTML in the plugin output (obsoleted by urlize)   -t, --timeout=INTEGER  Seconds before connection times out (default: 10)

配置nrpe.cfg后，必须重启nrpe。重启方法(杀死进程，在重启)，否则更改不会生效

[root@localhost ~]# ps aux|grep nrpe   nagios 3327 0.0 0.0 4880 924 ? Ss Sep02 0:03 /usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d   root 22293 0.0 0.0 3908 648 pts/0 R+ 11:07 0:00 grep nrpe   [root@localhost ~]# /usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d

服务器端

测试与客户端连接，如下表示正常

[root@localhost nrpe-2.8b1]# /usr/local/nagios/libexec/check_nrpe -H 10.155.2.81   NRPE v2.8b1

下面表示不正常，见问题与解决(2)

[root@localhost nrpe-2.8b1]# /usr/local/nagios/libexec/check_nrpe -H 10.155.2.81   Connection refused by host

配置nagios.cfg，增加一条记录

[root@localhost ~]# vi /usr/local/nagios/etc/nagios.cfg   cfg_file=/usr/local/nagios/etc/objects/mylinux.cfg   cfg_file=/usr/local/nagios/etc/objects/commands.cfg ;此前面已经设置过

配置nagios.cfg，增加一条记录

vi /usr/local/nagios/etc/objects/commands.cfg  #在后面增加追加如下内容#check nrpedefine command{command_name check_nrpecommand_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$}mylinux

.cfg在目录中没有，需要自己添加

[root@localhost ~]# touch /usr/local/nagios/etc/objects/mylinux.cfg

#---------------------------------------------此段定义主机--------------------------------------------------------

define host{   use linux-server   host_name 10.155.2.81-cacti   alias mylinux   address 10.155.2.81   }

#--------------------------------下面定义服务器，也就是监控项------------------------------------------

define service{   use generic-service   host_name 10.155.2.81-cacti   service_description Swap Usage   check_command check_nrpe!check_swap   }   define service{   use generic-service   host_name 10.155.2.81-cacti   service_description Current Load   check_command check_nrpe!check_load   }   define service{   use generic-service   host_name 10.155.2.81-cacti   service_description Partition Usage   check_command check_nrpe!check_hda1   }   define service{   use generic-service   host_name 10.155.2.81-cacti   service_description Current Users   check_command check_nrpe!check_users   }   define service{   use generic-service   host_name 10.155.2.81-cacti   service_description Total Processes   check_command check_nrpe!check_total_procs   }   define service{   use generic-service   host_name 10.155.2.81-cacti   service_description PING   check_command check_nrpe!check_ping81   }

重启nagios，ie浏览(图3)

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