RHEL6.5下Nagios环境部署

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系统环境:RHEL6 x86_64
selinux and iptables disabled
nagios 主机:192.168.0.71
mysql 主机: 192.168.0.36

依赖性及环境

yum install httpd gcc make gd-devel  -y
gd-devel 如果 yum 源中没有可自行下载与 gd 版本一致的开发包
yum install mysql-devel openssl-devel -y
useradd nagios
usermod -G nagios apache

运行 nagios 服务的用户
使 apache 用户对 nagios 目录具有写权限, 不然 web 页面操作失败

nagios 软件安装

tar jxf nagios-cn-3.2.3.tar.bz2
cd nagios-cn-3.2.3
./configure            # 编译 
make all
make install
make install-init
make install-commandmode
make install-config
make install-webconf

安装编译所需软件包编译时缺什么装什么

插件安装

tar zxf nagios-plugins-1.4.15.tar.gz            #nagios 插件安装 
cd nagios-plugins-1.4.15
./configure  
make
make install

相关配置文件

vim /usr/local/nagios/etc/nagios.cfg
#nagios 配置 
# 新建 hosts.cfg 文件, 存放主机与主机组定义 
cfg_file=/usr/local/nagios/etc/objects/hosts.cfg

# 新建 services.cfg 文件, 存放服务与服务组定义 
cfg_file=/usr/local/nagios/etc/objects/services.cfg

#cfg_file=/usr/local/nagios/etc/objects/localhost.cfg
# 注释 localhost.cfg 文件 

#vim /usr/local/nagios/etc/objects/host.cfg
# 定义本地主机 
define host{
        use                             linux-server            
        host_name                       server471.example.com
        alias                           manager
        address                         127.0.0.1
        icon_image                  server.gif
        statusmap_image             server.gd2
        2d_coords                   500,200
        3d_coords                   500,200,100
        }
# 定义远程主机 
define host{
        use                             linux-server            
        host_name                   server472.example.com
        parents                         server471.example.com
        alias                           mysql
        address                         172.25.47.2
        icon_image                  server.gif
        statusmap_image             server.gd2
        2d_coords                   100,200
        3d_coords                   100,100,0
                    }
# 主机组并不是必须的, 这是配合 nagios 的监控页面的显示 
# 定义主机组 
define hostgroup{
        hostgroup_name          linux-servers 
        alias                       Linux Servers 
        members                 *   
                    }

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

# 定义服务组 
define servicegroup{
        servicegroup_name   系统负荷检查
        alias                       负荷检查
        members                 server471.example.com, 进程总数,server471.example.com, 登录用数,server471.example.com, 根分区,server471.example.com, 交换空间利用率
        }
# 定义服务 
define service{
        use                     local-service       
        host_name           *
        service_description   PING
        check_command  check_ping!100.0,20%!500.0,60%                               }

执行：/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg 
显示：Total Warnings: 0
Total Errors:   0
# 校验 nagio 配置文件的正确性 
无报错 重启服务

htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin 
# 设置 nagios 监控页面访问用户和密码 

service nagios start 
service httpd start
# 启动 nagios 和 httpd 服务 

http://192.168.0.71/nagios # 访问 nagios 监控页面, 输入上面添加的用户名和密码

RHEL6.5 下 Nagios 环境部署

监控 mysql 主机

mysql 主机上运行有 mysql 服务, 在其上创建监控检测帐户
mysql> create database nagdb;
mysql> grant select on nagdb.* to nagdb@'192.168.0.71';
mysql> flush privileges;


在 nagios 主机上检测是否可以连接 mysql 主机上的 mysql 服务

/usr/local/nagios/libexec/check_mysql -H 192.168.0.36 -u nagdb -d nagdb

Uptime: 73 Threads: 1 Questions: 7 Slow queries: 0 Opens: 15 Flush tables: 1 Open tables: 8
Queries per second avg: 0.95

在 nagios 主机上添加对 mysql 服务监控的定义
#vim /usr/local/nagios/etc/objects/hosts.cfg 
添加如下行
#define host{
        use                             linux-server            
        host_name                   server472.example.com
        parents                         server471.example.com
        alias                           mysql
        address                         172.25.47.2
        icon_image                  server.gif
        statusmap_image             server.gd2
        2d_coords                   100,200

#vim /usr/local/nagios/etc/objects/services.cfg 添加如下行 
define service{
use                     local-service
host_name               mysql 主机
servce_groups           mysql 服务组
service_description mysql 服务
check_command       check_mysql
}

define servicegroup{
servicegroup_name    mysql 服务组
alias                           mysql 服务器
}
vim /usr/local/nagios/etc/objects/commands.cfg 添加如下行
# 'check_mysql' command definition
define command{
        command_name    check_mysql
        command_line    $USER1$/check_mysql -H $HOSTADDRESS$ -u $ARG1$ -p $ARG2$ -d $ARG3$
        }
执行：/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
显示：Total Warnings: 0
Total Errors:   0
重启服务

Nagios 通过 NRPE 监控远程主机系���状况
Nagios 实现远程监控 server2 系统状况

配置 Server2

tar zxf nrpe-2.15.tar.gz
cd nrpe-2.15

yum install gcc 
yum install openssl-devel     # 解决软件依赖性 

usreadd nagios

./configure         # 编译后按提示操作  缺什么装什么 

make all
make install-plugin
useradd nagios
make install-plugin
make install-daemon
make install-daemon-config
make install-xinetd

yum install -y xinetd
vim /etc/xinetd.d/nrpe

disable         = no
only_from       = 172.25.47.1       # 监控端 IP

vim /etc/services

nrpe            5666/tcp            # 添加端口 

/etc/init.d/xinetd restart
netstat -antlp      # 检查是否添加成功 




 scp /usr/local/nagios/libexec/check_nrpe  root@172.25.47.1:/usr/local/nagios/libexec/  
# 将被监控端安装的 check_nrpe 发送至监控端的同目录下也可以在监控端自己安装 
* 在监控端要将 check_nrpe 所属组和用户改为 nagios

安装 plugins 模块
 tar zxf nagios-plugins-2.1.1.tar.gz
 cd nagios-plugins-2.1.1
 ./configure
 make
 make install
 cd /usr/local/nagios/etc/

 vim 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_disk]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /
###################################
监控端可监控服务


监控端 server1 下 进行如下测试:

cd /usr/local/nagios/libexec

./check_nrpe -H 172.25.47.2     # -H 指定被监控端 IP
NRPE v2.15                      # 得到 NRPE 版本号 即可 


命令行监控方法
./check_nrpe -H 172.25.47.2 -c check_users

图形实时监控方法

配置监控端 server1 中 nagios 的文件
/usr/local/nagios/etc/objects
vim commands.cfg

# 'check_nrpe' command definition
define command{
        command_name    check_nrpe
        command_line    $USER1$/check_nrpe -H $HOSTADDRESS$ -u $ARG1$ -c $ARG1$
        }

vim services.cfg

define service{
        use                             local-service
        host_name                       server472.example.com
        service_description             根分区
        check_command                   check_nrpe!check_disk
        }


vim hosts.cfg

define host{
        use                     linux-server          
        host_name              server472.example.com
        parents                 server471.example.com
        alias                       mysql
        address                 172.25.47.2
        icon_image              server.gif
        statusmap_image         server.gd2
        2d_coords               100,200
        3d_coords               100,100,0
                }

执行：/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
显示：Total Warnings: 0
Total Errors:   0
重启服务