Nagios监控部署(一)

Nagios部署(一)

1) 安装准备

系统：redhat7.1(监控端)、centos6.5(被监控端)

软件：nagios-cn-3.2.3.tar.bz2、gd-devel-2.0.35-26.el7.x86_64.rpm、nagios-plugins-2.1.1.tar.gz

主机名	IP地址	角色
host.mystudy.com	192.168.1.183	监控端
chunlin	139.199.181.155	被监控端1（远程）
client5	192.168.1222.15	被监控端2（同网段）
防火墙：关闭
SELinux：Disabled
时间：保持同步

2) 安装nagios

[root@host ~]# yum install -y httpd
[root@host ~]# yum install -y gd-devel-2.0.35-26.el7.x86_64.rpm
[root@host ~]# mkdir /usr/local/nagios
[root@host ~]# useradd -s /sbin/nologin nagios
[root@host ~]# groupadd nagcmd

使外部操作能够在Web界面上提交

root@host ~]# usermod -aG nagcmd nagios
root@host ~]# usermod -aG nagcmd apache

[root@host nagios]# tar -jxf nagios-cn-3.2.3.tar.bz2
[root@host nagios-cn-3.2.3]# ./configure
--with-command-group=nagcmd --prefix=/usr/local/nagios
[root@host nagios-cn-3.2.3]# make all
[root@host nagios-cn-3.2.3]# make install
[root@host nagios-cn-3.2.3]# make install-init

创建Nagios启动脚本

[root@host nagios-cn-3.2.3]# make install-config

安装Nagios示例配置文件

[root@host nagios-cn-3.2.3]# make install-commandmode

配置目录权限

[root@host nagios-cn-3.2.3]# make install-webconf

创建/etc/httpd/conf.d/nagios.conf

[root@host nagios-cn-3.2.3]# htpasswd -c \
/usr/local/nagios/etc/htpasswd.users nagiosadmin

创建Nagios的Web界面登录账号和密码

[root@host nagios-cn-3.2.3]# /usr/local/nagios/bin/nagios -v
/usr/local/nagios/etc/nagios.cfg

检查Nagios配置文件正确性

[root@host etc]# systemctl restart httpd
[root@host etc]# systemctl start nagios

在浏览器中输入http://localhost/nagios/即可看到Web监控界面

3) 安装nagios-plugin

[root@client5 nagios-plugins-2.2.0]# yum install -y
perl-ExtUtils-MakeMaker
[root@host nagios]# yum install -y openssl-devel
[root@host nagios]# yum install -y mariadb-devel
[root@host nagios]# tar -zxf nagios-plugins-2.2.0.tar.gz
[root@host nagios-plugins-2.2.0]# ./configure --prefix=/usr/local/nagios --with-nagios-user=nagios
--with-nagios-group=nagios
--enable-extra-opts
--enable-libtap
--enable-perl-modules

configure过程的输出结果如下：

支持mysql监控、支持SSL加密、支持extra-opts、perl-modules、libtap

[root@host nagios-plugins-2.2.0]# make
[root@host nagios-plugins-2.2.0]# make install

4) 配置监控实例

• 本地监控：

[root@host ~]# cd /usr/local/nagios/etc/objects
[root@host objects]# cp -p localhost.cfg hosts.cfg
[root@host objects]# cp -p localhost.cfg services.cfg
[root@host objects]# vim ../nagios.cfg

cfg_file处添加如下两行：

cfg_file=/usr/local/nagios/etc/objects/hosts.cfg
cfg_file=/usr/local/nagios/etc/objects/services.cfg

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

将localhost.cfg这一项注释掉

[root@host objects]# vim hosts.cfg

define host{
     use                     linux-server
     host_name               host.mystudy.com
     alias                   Manager
     address                 127.0.0.1
     icon_image              server.gif
     statusmap_image         server.gd2
     2d_coords               500,200
     3d_coords               500,200,200
     }
define hostgroup{
     hostgroup_name  linux-servers 
     alias           Linux Servers
     members         *   
    }

定义主机和主机组

[root@host objects]# vim services.cfg

define servicegroup{
      servicegroup_name Local_Check
      alias Load_Check
      members host.mystudy.com,local_disk,host.mystudy.com,local_user_login,host.mystudy.com,local_load,host.mystudy.com,local_swap,host.mystudy.com,local_process,host.mystudy.com,PING
    }

定义资源组和资源，资源的定义默认都给出了就不在这一一列出了

• 远程监控：

[root@host objects]# vim hosts.cfg

 # 新增如下主机定义

define host{
    use                     linux-server
    host_name               chunlin
    alias                   Web
    address                 139.199.181.155
    icon_image              server.gif
    statusmap_image         server.gd2
    2d_coords               500,100
    3d_coords               500,100,200
    }

• check_mysql

[root@host objects]# vim commands.cfg

define command{
    command_name    check_mysql
    command_line    $USER1$/check_mysql -H $HOSTADDRESS$ -u $ARG1$ -p $ARG2$ -d $ARG3$
    }

-H：主机地址 -u：mysql授权用户 -p：mysql密码 -d：库

• check_ftp

[root@host objects]# vim commands.cfg

define command{
    command_name   check_ftp
    command_line   $USER1$/check_ftp -H $HOSTADDRESS$ -p 21 -w $ARG1$ -c $ARG2$
    }

-w：告警时延 -c：严重告警时延

[root@host objects]# vim services.cfg

新增资源组定义如下

define servicegroup{
    servicegroup_name Web_Check
    alias Load_Check
    members chunlin,PING,chunlin,MySQL,chunlin,FTP
    }

新增资源定义如下

define service{
    use                             local-service         
    host_name                       chunlin
    service_description             MySQL
    check_command                   check_mysql!xx!xx!mysql
    notifications_enabled           0
    }

define service{
    use                             local-service         
    host_name                       chunlin
    service_description             FTP
    check_command                   check_ftp!0.080!0.20
    notifications_enabled           0
    }

[root@host objects]# nagios -v /usr/local/nagios/etc/nagios.cfg
[root@host objects]# systemctl restart nagios.service

5) 远端本地资源监控

• 远端主机安装plugin+nrpe
  nagios-plugin在这就不赘述，前面有详细说明
  nrpe安装：

[root@chunlin ~]# yum install -y xinetd
[root@chunlin nagios]# tar -zxf nrpe-2.15.tar.gz
[root@chunlin nagios]# cd nrpe-2.15
[root@chunlin nrpe-2.15]# ./configure --prefix=/usr/local/nagios

configure过程的输出结果如下：

[root@chunlin nrpe-2.15]# make all
[root@chunlin nrpe-2.15]# make install-plugin
[root@chunlin nrpe-2.15]# make install-daemon
[root@chunlin nrpe-2.15]# make install-daemon-config
[root@chunlin nrpe-2.15]# make install-xinetd
[root@chunlin libexec]# vim /etc/xinetd.d/nrpe
only_from = xxx.xxx.xxx.xxx #nagios监控主机IP地址或域名
[root@chunlin libexec]# vim /usr/local/nagios/etc/nrpe.cfg

将对磁盘的检测命令修改为如下

command[check_disk]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /
[root@chunlin libexec]# vim /etc/services

添加如下一行

nrpe 5666/tcp #nrpe
[root@chunlin libexec]# /etc/init.d/xinetd start

• 本地主机安装nrpe

[guest@host nagios]$ tar -zxf nrpe-2.15.tar.gz
[root@host nagios]# cd nrpe-2.15/
[root@host nrpe-2.15]# ./configure --prefix=/usr/local/nagios
--with-nagios-user=nagios
--with-nagios-group=nagios
[root@host nrpe-2.15]# make all
[root@host nrpe-2.15]# make install-plugin
[root@host objects]# vim commands.cfg

    define command{
       command_name    check_nrpe
       command_line    $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
    }

[root@host objects]# vim services.cfg

    define servicegroup{
    servicegroup_name Local_Check
    alias disk_Check
    members client5,check_disk
    }

    define service{
    use                             local-service         
    host_name                       client5
    service_description             check_disk
    check_command                   check_nrpe!check_disk
    notifications_enabled           0
    }

[root@host objects]# nagios -v /usr/local/nagios/etc/nagios.cfg
[root@host objects]# systemctl restart nagios.service