Nagios

一 对比

Cacti：
　　收集数据、图形展现
　　偏重网络流量
　　SNMP、OID、SNMP Agent

Nagios：
　　偏重主机、服务的状态
　　Agent
　　脚本

 

二 原理

原理-1

监控对象
　　主机、主机组
　　服务/资源，服务组
　　联系人，联系人组
　　时段
　　命令

 

原理-2
     

 

 原理-3

     

 

 原理-4

    

 

三 操做

1. 安装前的准备工做

1)解决安装Nagios的依赖关系
 yum -y install httpd gcc glibc glibc-common *gd* php php-mysql mysql mysql-server mysql-devel  #gd先去除
 
 2)所须要安装组件：
 服务端所用的安装包为 nagios nagios-plugins ndoutils(非必须)
linux客户端 nrpe
windows客户端 NSClient++
 
 3)
 进行selinux设置，或者关闭selinux
 
 
 4)开始搭建
 添加nagios运行所须要的用户和组：

    # groupadd nagcmd
    # useradd -m nagios
    # usermod -a -G nagcmd nagios

    # usermod -a -G nagcmd apache

 

2. 编译安装nagios

# tar zxf nagios-3.1.2.tar.gz 
# cd nagios-3.1.2
# ./configure --with-command-group=nagcmd --enable-event-broker 

# make all
# make install
# make install-init
# make install-config
# make install-commandmode

# vi /usr/local/nagios/etc/objects/contacts.cfg 
    email        nagios@localhost       #这个是默认设置

# make install-webconf

# htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin

# service httpd restart

 

3. 编译、安装nagios-plugins

yum -y install openssl openssl-devel
# tar -zxf nagios-plugins-1.4.15.tar.gz 
# cd nagios-plugins-1.4.15
# ./configure --with-nagios-user=nagios --with-nagios-group=nagios --with-mysql --enable-perl-modules

# make && make install

 

4. 配置并启动Nagios

# chkconfig --add nagios
# chkconfig nagios on

# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg    #检测是否有错误
    Total Warnings: 0
    Total Errors:   0

# service nagios start

浏览器测试： 登陆时须要指定前面设定的web认证账号和密码
http://192.168.10.10/nagios/
user：nagiosadmin
pwd: 123

 

windos端

1.被监控端安装NSClient++-0.3.8-Win32.msi    #netstat -an --> tcp 5666
2.安装完成后修改配置文件NSC.ini把须要的库都打开


3.在监控服务器上修改nagios配置文件nagios.cfg
去掉注释cfg_file=/usr/local/nagios/etc/objects/windows.cfg
定义windows.cfg
define host{
        use             windows-server  ; Inherit default values from a template
        host_name       winserver       ; The name we're giving to this host
        alias           My Windows Server       ; A longer name associated with the host
        address         192.168.0.191   ; 你主机的IP
        }

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

 

 

linux端

被监控端
先添加nagios用户
useradd nagios
为了安装nrpe，先安装nagios-plugins-1.4.15.tar.gz 插件
yum -y install openssl openssl-devel  gcc*
# tar zxf nagios-plugins-1.4.15.tar.gz 
# cd nagios-plugins-1.4.15
# ./configure --with-nagios-user=nagios --with-nagios-group=nagios
# make all
# make install

tar -zxvf nrpe-2.12.tar.gz
cd nrpe-2.12.tar.gz
./configure --enable-ssl --with-ssl-lib=/usr/lib64/
make all
make install-plugin
make install-daemon
make install-daemon-config

4.配置nrpe信息
vim /usr/local/nagios/etc/nrpe.cfg
    allowed_hosts=192.168.216.251,127.0.0.1  //容许监控的IP
    
[root@localhost nrpe-2.8.1]# /usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d

[root@localhost nrpe-2.8.1]# netstat -an | grep :5666
tcp        0      0 0.0.0.0:5666                0.0.0.0:*                   LISTEN     

 

服务端

3.安装NRPE
cd nagios-nrpe_2.8.1
./configure   #默认自动添加了openssl


#由于传送过程要加密,若是后面make报错,加以下参数
rpm -qa| grep ssl
openssl-devel-0.9.7a-43.17.el4_6.1
rpm -ql openssl-devel-0.9.7a-43.17.el4_6.1 | more


./configure --enable-ssl --with-ssl-lib=/usr/lib64/(固然前提要有openssl)
make all
make install-plugin


---安装check_nrpe脚本

4.commands.cfg定义外部构件nrpe
vi /usr/local/nagios/etc/objects/commands.cfg
#添加
#check nrpe
define command{
        command_name check_nrpe
        command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
        }


定义 mylinux.cfg
define host{
           use             linux-server   #到 vim templates.cfg 里，肯定
          host_name     mylinux/IP
          alias            mylinux
          address        192.168.0.27(客户端IP既被监控的IP)
               }
define service{
        use                      generic-service
        host_name             mylinux
        service_description     check-load
       check_command         check_nrpe!check_load
               }

define service{
        use                      generic-service
        host_name             mylinux
       service_description     check-users
       check_command        check_nrpe!check_users
               }
define service{
        use                    generic-service
        host_name           mylinux
        service_description  otal_procs
        check_command     check_nrpe!check_total_procs
} 


[root@localhost etc]# vim nagios.cfg      

  39 cfg_file=/usr/local/nagios/etc/objects/windows.cfg  #网页才会显示
  40 cfg_file=/usr/local/nagios/etc/objects/linux.cfg