Nagios是一款开源的免费网络监视工具，能有效监控Windows、Linux和Unix的主机状态，交换机路由器等网络设置，打印机等。在系统或服务状态异常时发出邮件或短信报警第一时间通知网站运维人员，在状态恢复后发出正常的邮件或短信通知。
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前提时间需要同步
1.nagios依赖于php、http
2.查看依赖包是否已经被安装好
#rpm -q gcc glibc glibc-common gd gd-devel xinetd openssl-devel
默认的是没有gd-devel和xinetd的
# yum -y localinstall gd-devel-2.0.35-11.el6.x86_64.rpm
# yum install xinetd
3.添加nagios用户组、用户
# groupadd nagcmd
# useradd -G nagcmd nagios
# id nagios
uid=501(nagios) gid=502(nagios) 组=502(nagios),501(nagcmd)
# usermod -a -G nagcmd apache
4.安装nagios和nagios-plugins
# tar xf nagios-4.0.2.tar.gz
# cd nagios-4.0.2
# ./configure --prefix=/usr/local/nagios --with-command-group=nagcmd --enable-event-broker --sysconfdir=/etc/nagios
# make all
# make install
# make install-init
# make install-commandmode
# make install-config
# make install-webconf
# htpasswd -c /etc/nagios/htpasswd.users nagiosadmin
New password:
Re-type new password:
Adding password for user nagiosadmin
# service httpd restart
# chkconfig --add nagios
# chkconfig nagios on
# tar xf nagios-plugins-1.5.tar.gz
# cd nagios-plugins-1.5
# ./configure --with-nagios-user=nagios --with-nagios-group=nagios
# make && make install
# service nagios start
关闭selinux，防止selinux组织脚本运行
5.登录nagios-web界面
http://nagiosIP/nagios
输入用户名和密码
6.被监控端安装nagios-plugins
所需软件nagios-plugins、nrpe
# tar xf nagios-plugins-1.5.tar.gz
# useradd -s /sbin/nologin nagios
# cd nagios-plugins-1.5
# ./configure --with-nagios-user=nagios --with-nagios-group=nagios
# make all
# make install
7.被监控端安装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
# make install-daemon
# make install-daemon-config
# /usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d //启动nrpe服务
或者 # vim /etc/init.d/nrped
#!/bin/bash
# chkconfig: 2345 88 12
# description: NRPE DAEMON
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
# /etc/init.d/nrped start
8.在主监控添加nrpe的定义
# 'check_nrpe' command definition
define command{
command_name check_nrpe
command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
}9.增加主机监控配置项
# vim /etc/nagios/objects/131.cfg
define host{
use linux-server
host_name 192.168.235.131
alias 192.168.235.131
address 192.168.235.131
}
define service{
use generic-service
host_name 192.168.235.131
service_description load
check_command check_nrpe!check_load
}
define service{
use generic-service
host_name 192.168.235.131
service_description PING
check_command check_ping!100.0,20%!200.0,50%
max_check_attempts 5
normal_check_interval 1
}
define service{
use generic-service
host_name 192.168.235.131
service_description FTP
check_command check_ftp!21
max_check_attempts 5
normal_check_interval 1
}
define service{
use generic-service
host_name 192.168.235.131
service_description SSH
check_command check_ssh
max_check_attempts 5
normal_check_interval 1
}
define service{
use generic-service
host_name 192.168.235.131
service_description HTTP
check_command check_http
max_check_attempts 5
normal_check_interval 1
}
# vim /etc/nagios/nagios.cfg
cfg_file=/etc/nagios/objects/131.cfg
# service nagios reload 重载刷新nagios-web界面可以看到添加的被监控主机 好了，此处nagios已经被安装好了，而且被监控节点也已经上线了！
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