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linux客户端需要的软件有：nagios-plugins、nrpe
windows客户端需要安装：NSClient++.msi文件
Nagios服务器/usr/local/nagios/etc/objects目录下放被监控主机的cfg文件，使用use语句引用templates.cfg模板中的对象属性，
linux中nagios配置详解http://bbs.linuxtone.org/thread-2328-1-1.html
[root@centos objects]#vi /usr/local/nagios/etc/objects/windows.cfg
define host{
use windows-server ; Inherit default values from a template
host_name server ; The name we're giving to this host
alias My Windows Server ; A longer name associated with the host
address 192.168.0.8 ; IP address of the host
}
之后在/usr/local/nagios/etc/nagios.cfg文件中添加该路径，重启nagios服务就会在WEB出现。
上面是少量监控的配置方法。★★★
检查nagios配置文件语法错误：/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
★nagios服务器监控linux主机的操作
Linux下Nagios的安装与配置 http://www.cnblogs.com/mchina/archive/2013/02/20/2883404.html
必须下载安装nrpe-2.*.tar.gz
tar xzf nrpe-2.8.1.tar.gz
cd nrpe-2.8.1
./configure
make all
make install-plugin
-------------------
tar xzf nrpe-2.8.1.tar.gz
cd nrpe-2.8.1
./configure
make all
make install-plugin
make install-daemon
make install-daemon-config
为被监控远程主机定义host和service
1、定义check_nrpe命令
在文件/usr/local/nagios/etc/objects/commands.cfg后面增加：
# 'check_nrpe' command definition
define command{
command_name check_nrpe
command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -t 30 -c $ARG1$
}
2、创建/usr/local/nagios/etc/objects/remotehost.cfg
#host定义示例部分：
define host{
use linux-server
host_name remotehost
address 192.168.0.252
}
#Service定义示例部分：
define service{
use generic-service
service_description Root Partition
check_command check_nrpe!check_disk
}
3、添加此文件到nagios.cfg全局配置文件中
vi /usr/local/nagios/etc/nagios.cfg
cfg_file=/usr/local/nagios/etc/objects/remotehost.cfg
配置之前做好文件备份“/usr/local/nagios/etc/objects/*”和“nagios.cfg”
★★★★★添加大量被监控主机方法
需要新建的文件：contactgroups.cfg contacts.cfg hostgroups.cfg hosts.cfg services.cfg timeperiods.cfg
参照http://sery.blog.51cto.com/10037/20520
◆vi /usr/local/nagios/etc/objects/hosts.cfg //主机配置文件路径
define host{
host_name centos
alias centos
address 192.168.0.253
max_check_attempts 5
#check_interval 1
#retry_interval 1
check_period 24x7
contact_groups sa_groups
notification_interval 30
#first_notification_delay
notification_period 24x7
notification_options d,u,r
}
copy以上内容，修改主机名和ip即可， 如：red-192.168.0.252
◆vi /usr/local/nagios/etc/objects/hostgroups.cfg //主机组配置文件路径
define hostgroup{
hostgroup_name http_hosts
alias http_hosts
members red,centos
}
类似该文档下面继续添加。
也可以创建一个文件加入多个被监控主机的信息
◆vi /usr/local/nagios/etc/objects/services.cfg //服务配置文件路径
define service {
host_name centos
service_description check-host-alive
check_period 24x7
max_check_attempts 4
normal_check_interval 3
retry_check_interval 2
contact_groups http_hosts
notification_interval 10
notification_period 24x7
notification_options w,u,c,r
check_command check-host-alive //检查主机是否存活
}
copy以上内容，修改主机名和ip即可
◆vi timeperiods.cfg //监视时段配置文件路径
define timeperiod{
timeperiod_name 24x7
alias 24 Hours A Day, 7 Days A Week
sunday 00:00-24:00
monday 00:00-24:00
tuesday 00:00-24:00
wednesday 00:00-24:00
thursday 00:00-24:00
friday 00:00-24:00
saturday 00:00-24:00
}
◆vi contacts.cfg //联系人配置文件路径
define contact {
contact_name sa //不要有空格，使用tab键
alias system administrator
service_notification_period 24x7
host_notification_period 24x7
service_notification_options w,u,c,r
host_notification_options d,u,r
service_notification_commands service-notify-by-sms,service-
notify-by-email //这个命令读配置文件miscommands.cfg
host_notification_commands host-notify-by-email,host-noti
fy-by-sms //这个命令读配置文件miscommands.cfg
email sery@163.com
pager 13333333333 //手机号，收报警短信
}
copy以上内容，修改其他联系人就是
◆vi contactgroups.cfg //联系组配置文件路径
define contactgroup {
contactgroup_name sagroup //不要用空格，使用tab键
alias system administrator group
members sa,sery //本例有2个成员
}
把以上所有创建的文件添加在nagios.cfg全局配置文件中
Starting nagios:This account is currently not available nagios启动报错
解决方法：
修改/etc/passwd
将/sbin/nologin改成/bin/bash
★★NRPE客户端的安装
http://blog.csdn.net/jiedushi/article/details/6524375
nagios 客户端安装LINUX
./configure
make all
make install-plugin
make install-daemon
make install-daemon-config
yum install xinetd
make install-xinetd
检查NRPE正确安装与否命令：/usr/local/nagios/libexec/check_nrpe -H localhost
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