nagios用NRPE监控Linux主机 服务端和客户端的安装配置

安装配置nagios服务端：

安装前的准备工作

yum -y install httpd gcc glibc glibc-common gd gd-devel php php-mysql mysql mysql-devel mysql-server
groupadd nagcmd
useradd -G nagcmd nagios
passwd nagios
usermod -a -G nagcmd apache

vim /etc/httpd/conf/httpd.conf

DirectoryIndex index.php index.html index.html.var  #找到这一行，添加index.php

编译安装nagios：

wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-4.0.5.tar.gz
tar zxf nagios-4.0.5.tar.gz
cd nagios-4.0.5
./configure --with-command-group=nagcmd --enable-event-broker
make all
make install
make install-init
make install-commandmode
make install-config

附：在解压的时候如果提示下面的错误，是因为系统时间不对

tar: nagios-4.0.5/xdata/xsddefault.c: time stamp 2014-04-12 02:37:42 is 250653.223481153 s in the future

tar: nagios-4.0.5/xdata/xsddefault.h: time stamp 2014-04-12 02:37:42 is 250653.223419364 s in the future

tar: nagios-4.0.5/xdata: time stamp 2014-04-12 02:37:42 is 250653.223359922 s in the future

修改系统时间

cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime  

service ntpd stop

ntpdate asia.pool.ntp.org ; hwclock -w

需要在httpd的配置文件目录(conf.d)中生成Nagios的Web程序配置文件，继续在此编译安装目录输入一条命令：

# make install-webconf

创建一个登录nagios web程序的用户，这个用户帐号在以后通过web登录nagios认证时所用：

# htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin #输入登陆nagios的密码

# service httpd restart

编译、安装nagios-plugins

nagios的所有监控工作都是通过插件完成的，因此，在启动nagios之前还需要为其安装官方提供的插件。http://exchange.nagios.org/directory/Plugins nagios插件链接

wget http://nagios-plugins.org/download/nagios-plugins-2.0.tar.gz
tar zxf nagios-plugins-2.0.tar.gz
cd nagios-plugins-2.0
./configure --with-nagios-user=nagios --with-nagios-group=nagios
make
make install

配置并启动Nagios

# chkconfig --add nagios

# chkconfig nagios on

检查其主配置文件

# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

# service nagios start

关闭selinux，

vim /etc/sysconfig/selinux  将其中的selinux后面的值“force”修改为“disable”或者

临时性的改动selinux也可以

# setenforce 0
# getenforce
Permissive

或者将nagios的CGI程序运行于SELinux/targeted模式而不用关闭selinux：

# chcon -R -t httpd_sys_content_t /usr/local/nagios/sbin

# chcon -R -t httpd_sys_content_t /usr/local/nagios/share

通过web界面查看nagios：

http://your_nagios_IP/nagios

输入帐号和密码

这时候可以看到本机的服务状态，如果没有出现页面，请检查iptables的80端口是否开放

如果出现下面提示，说明是selinux的问题，setenforce 0即可

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, root@localhost and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.

安装NRPE，服务端需要自己的check_nrpe，和被监控端联系

下载页面

http://downloads.sourceforge.net/project/nagios/nrpe-2.x/nrpe-2.15/nrpe-2.15.tar.gz?r=&ts=1363788540&use_mirror=hivelocity

tar -zxvf 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

如果./configure时候出现下面错误

checking for SSL headers... SSL headers found in /usr/local/ssl
checking for SSL libraries... configure: error: Cannot find ssl libraries

则

# find /usr/ -name libssl.so
/usr/local/ssl/lib/libssl.so
# ./configure --with-nrpe-user=nagios --with-nrpe-group=nagios --with-nagios-user=nagios  --with-nagios-group=nagios --enable-command-args --enable-ssl --with-ssl-lib=/usr/local/ssl/lib

安装配置被监控端：

yum -y install gcc glibc glibc-common gd gd-devel 

或者

yum grouplist  #检查  yum -y groupinstall "Development Tools" "Development Libraries"

添加nagios用户

useradd -s /sbin/nologin nagios
tar zxf nagios-plugins-2.0.tar.gz
cd nagios-plugins-2.0
./configure --with-nagios-user=nagios --with-nagios-group=nagios --with-mysql=/usr/local/mysql
make all
make install

安装NRPE

下载页面

http://downloads.sourceforge.net/project/nagios/nrpe-2.x/nrpe-2.15/nrpe-2.15.tar.gz?r=&ts=1363788540&use_mirror=hivelocity

tar -zxvf 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

 注：如果./configure有下面提示，请 yum install openssl-devel
checking for SSL headers... SSL headers found in /usr/local/ssl
checking for SSL libraries... configure: error: Cannot find ssl libraries

配置NRPE

# vim /usr/local/nagios/etc/nrpe.cfg  找到相应的做修改

log_facility=daemon
pid_file=/var/run/nrpe.pid
server_address=172.16.100.11  #本机ip，本机提供nrpe服务，所以自己为服务端,此行需手动添加
server_port=5666
nrpe_user=nagios
nrpe_group=nagios
allowed_hosts=172.16.100.1  #监控端的ip
command_timeout=60
connection_timeout=300
debug=0

启动NRPE

# /usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d

为了便于NRPE服务的启动，可以将如下内容定义为/etc/init.d/nrped脚本,用service nrped start 启动：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

chmod +x /etc/init.d/nrped

基于NRPE的监控

配置允许远程主机监控的对象

vim /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_hda1]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /dev/hda1

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

上面是系统自带的，下面是添加的

command[check_rootdisk]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /
command[check_swap]=/usr/local/nagios/libexec/check_disk -w 40% -c 20%
command[check_sensors]=/usr/local/nagios/libexec/check_sensors
command[check_zombies]=/usr/local/nagios/libexec/check_procs -w 5 -c 10 -s Z
command[check_sda1]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /dev/sda1
command[check_sda3]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /dev/sda3
#对mysql监控：
command[check_mysql]=/usr/local/nagios/libexec/check_mysql -utest -ptest -s /var/lib/mysql/mysql.sock -H localhost
#为了监控mysql需要在被监控的mysql加授权
#create database test;
#grant select on test.* to test@localhost identified by "test";
#flush privileges;

因为我这里是sda1和sda3,磁盘检测请添加自己的

# service nrped restart

再回到nagios服务端  定义配置

cd /usr/local/nagios/libexec

./check_nrpe -H 172.16.100.11 #测试一下

如果提示CHECK_NRPE: Socket timeout after 10 seconds. 那就把iptables的5666端口打开

/usr/local/nagios/libexec/check_nrpe -H 172.16.100.11 -c check_load

OK - load average: 1.55, 1.31, 1.30|load1=1.550;15.000;30.000;0; load5=1.310;10.000;25.000;0; load15=1.300;5.000;20.000;0; 

配置服务端

先定义命令  commands.cfg  

vim /usr/local/nagios/etc/objects/commands.cfg

在最后添加

define command{

 command_name check_nrpe

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

       }

再定义主机和服务

vim /usr/local/nagios/etc/objects/linuxhost.cfg  

define host{
        use                     linux-server
        host_name               my linux server
        alias                   mylinux server
        address                 172.16.100.11 #被监控端的ip
        }
define service{
        use                             generic-service
        host_name                       my linux server
        service_description             check users
        check_command                   check_nrpe!check_users
        }
define service{
        use                             generic-service
        host_name                       my linux server
        service_description             check load
        check_command                   check_nrpe!check_load
        }
define service{
        use                             generic-service
        host_name                       my linux server
        service_description             check zombie proce
        check_command                   check_nrpe!check_zombie_procs
        }
define service{
        use                             generic-service
        host_name                       my linux server
        service_description             check total proce
        check_command                   check_nrpe!check_total_procs
        }
define service{
        use                             generic-service
        host_name                       my linux server
        service_description             check rootdisk
        check_command                   check_nrpe!check_rootdisk
        }
define service{
        use                             generic-service
        host_name                       my linux server
        service_description             check swap
        check_command                   check_nrpe!check_swap
        }
define service{
        use                             generic-service
        host_name                       my linux server
        service_description             check sda1
        check_command                   check_nrpe!check_sda1
        }
define service{
        use                             generic-service
        host_name                       my linux server
        service_description             check sda3
        check_command                   check_nrpe!check_sda3
        }
define service{
        use                             generic-service
        host_name                       my linux server
        service_description             check mysql
        check_command                   check_nrpe!check_mysql
        }

vim /usr/local/nagios/etc/nagios.cfg  #添加刚才的配置文件

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

/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg #检查配置是否正确

service nagios restart

到网页查看nagios

如果出现下面的提示，是说明iptables开启了，不过开启的是udp 5666端口，而不是tcp，这里需要开启tcp的5666

[1416991726] Warning: Return code of 255 for check of service 'check total proce' on  host 'my linux server' was out of bounds