怎么在RedHat6.5上部署Nagios

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部署环境：系统，RedHat 6.5;组件，Nagios;

部署前准备：关闭Selinux,和防火墙（/etc/init.d/iptables stop）；获取相关软件包。

（包括gd-devel mysql-server openssl-devel xinetd;等）

具体步骤：

1.在Nagios运行的主机上创建Nagios用户和nagcmd组；

groupadd nagcmd;

useradd -M -d /usr/local/nagios -G nagcmd nagios;

usermod -G nagcmd  apache

2.解压相应的源码包和插件包；并指定编译环境和参数；

cd /guo

tar jxf nagios-cn-3.2.3.tar.bz2;

cd nagios-cn-3.2.3

###指定编译环境组为"ngcmd";

./configure --with-command-group=nagcmd;

###开始编译并安装

make all &&　make install

###安装启动脚本

make install-init;

###安装WEB配置文件

make install-webconf;

###安装配置文件

make install-config;

###设定Nagios的登陆用户名和密码；

htpasswd/usr/local/nagios/etc/htpasswd.users nagiosadmin

##＃检查配置正确性

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

确保无Error 或者warning。

3.启动相关服务并测试；

/etc/init.d/nagios start

/etc/init.d/httpd start

4.安装相关插件。

cd /guo

 tar zxf nagios-plugins-2.1.1.tar.gz 

cd nagios-plugins-2.1.1

./configure

###执行完毕应确保自身所需的功能后面的状态显示“yes”;比如后面要用到Mysql和ssl协议加密；那结果至少包含"--with-mysql:yes,--with-openssl:yes"

###插件会被自动安装至/usr/local/nagios/libexec；

cd /usr/local/nagios/libexec;

###调整并递归此目录下所有文件

chown nagios.nagios . -R ；

###再次检查配置

/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg 
###重载Nagios配置
/etc/init.d/nagios reload         

  5.编辑相关配置文件。

cd /usr/local/nagios/etc/objects/

cp  -p localhost.cfg hosts.cfg

cp -p localhost.cfg services.cfg

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

###添加如下内容：

###通过hosts.cfg文件来指定被监控主机及其相关信息；

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

###通过services.cfg文件定义监控哪些服务和资源。

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

###vi hosts.cfg

                definehost{
                    use                     linux-server
                    host_name               pu_tao.example.com
                    alias                   Manager
                    address                 172.25.254.18
                    icon_p_w_picpath              server.gif
                    statusmap_p_w_picpath         server.gd2
                    2d_coords               500,200
                    3d_coords               500,200,100
                    }


            define hostgroup{
            hostgroup_name  linux-servers
            alias           Linux Servers
            members         *
              }
本次取一台被监控主机做实验，仅写一个服务组

                define servicegroup{
               servicegroup_name 系统负荷检查
                alias 负荷检查
                members server2.example.com,进程总数,server2.example.com用户登录 数,server2.example.com,根分区,server2.example.com,交换空间利用率
               }

    监控ping的情况

            defineservice{    
                    use                             local-service        
                    host_name                       *
                    service_description             PING
                    check_command                   check_ping!100.0,20%!500.0,60%
                    }

     监控硬盘情况

              defineservice{
                   use                             local-service        
                    host_name                       xi_gua.example.com
                    service_description             根分区
                    check_command                   check_local_disk!20%!10%!/
                   }

     监控登录用户数

            defineservice{
                use                             local-service        
               host_name                      xi_gua.example.com
                service_description             登录用户数
                check_command                   check_local_users!20!50
               }
      监控系统负荷

          define service{
                use                             local-service        
                host_name                       xi_gua.example.com
               service_description             系统负荷
                check_command                   check_local_load!5.0,4.0,3.0!10.0,6.0,4.0
                }

        监控进程总数

            defineservice{
                use                             local-service        
                host_name                       xi_gua.example.com
                service_description             进程总数
               check_command                  check_local_procs!250!400!RSZDT
                }
        监控交换空间利用率

                define service{
                use                             local-service        
                host_name                       xi_gua.example.com
                service_description             交换空间利用率
                check_command                   check_local_swap!20!10
               }

        监控ssh情况

                define service{
                    use                             local-service        
                   host_name                      xi_gua.example.com
                   service_description             SSH
                   check_command                  check_tcp!22!1.0!10.0
                    notifications_enabled           0
                    }
          监控apache

                    defineservice{
                   use                             local-service        
                   host_name                      xi_gua.example.com
                   service_description            HTTP
                   check_command                  check_http
                  notifications_enabled           0
                    }

/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg 
/etc/init.d/nagios reload                         
如图显示本机的监控成功

6.再开启一台主机。本次实验主机名为xi_gua.example.com.ip:172.25.254.17；同样关闭Selinux和防火墙。

在本机上安装Mysql;并创建用户Nagios和赋予一定权限。
create database nagdb；

grant select on nagdb.* tonagios@172.25.254.18 identified by  'nagios'；

返回Nagios所在主机pu_tao.example.com;

cd    /usr/local/nagios/libexec
./check_mysql -H 172.25.254.3 -unagios -pnagios

执行完毕应有类似日志信息显示；如有且无报错说明本机成功监控对端mysql
cd /usr/local/nagios/etc/objects
在 commands.cfg 中添加监控mysql的命令

        # 'check_mysql' command definition    
            definecommand{
               command_name   check_mysql
                command_line   $USER1$/check_mysql -H $HOSTADDRESS$ -u $ARG1$ -p $ARG2$
                }
在services.cfg中添加监控mysql

     ##########################check_mysql
                   define service{
                      use                             local-service         
                        host_name                       xi_gua.example.com
                       service_description             MYSQL
                        check_command                   check_mysql!nagios!nagios
                        notifications_enabled           0
                        }

在hosts.cfg中添加

         define host{
               use                    linux-server
                host_name               xi_gua.example.com
                alias                   Manager
                parents                 xi_gua.example.com
                address                 172.25.254.17
               icon_p_w_picpath              server.gif
                statusmap_p_w_picpath         server.gd2
                2d_coords               400,100
                3d_coords               400,100,100
            }

/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
/etc/init.d/nagios reload                                        

如图表示成功检测server3主机上的mysql


8.安装Nrpe使nagios监控多台主机；在172.25.254.17（xi_gua.example.com）上操作。

###解压相关组件并创建nagios用户；
tar zxfnrpe-2.15.tar.gz                                                                   
tar zxf  nagios-plugins-2.1.1.tar.gz                    
yum install mysql-devel openssl-devel -y 
useradd  -M -d /usr/local/nagios  nagios            
cd nagios-plugins-2.1.1
./configure
make all &&　make install
cd /usr/local/nagios/libexec/       
chown nagios.nagios . -R          
yum install xinetd
cd /root/nrpe-2.15                          
./configure
make all && make install

make install-plugin
make install-daemon

make install-daemon-config

make install-xinetd

vim /etc/xinetd.d/nrpe    

 #设定监控主机为172.25.254.18
only_from       = 172.25.254.18
vim /etc/services
 nrpe   5666/tcp                        
/etc/init.d/xinetd start                    
cd /usr/local/nagios/etc/

vim nrpe.cfg           

将command[check_hda1]=/usr/local/nagios/libexec/check_disk-w 20% -c 10% -p /dev/hda1改为

command[check_disk]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p/  ＃监控根分区

/etc/init.d/xinetdrestart                 
cd /usr/local/nagios/libexec/     

 scp  check_nrpe root@172.25.254.18:/usr/local/nagios/libexec/ 将check_nrpe远程复制到pu_tao.exampl.com相应的目录中。
返回172.25.254.18；做如下操作
cd /usr/local/nagios/libexec/
chown nagios.nagios  check_nrpe   

 ###检测nrpe是否可用成功显示nrpe版本号
./chek_nrpe  -H  172.25.254.17           
cd /usr/local/nagios/etc/objcts/
在 commands.cfg 中添加check_nrpe的命令

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

在services.cfg中添加

        define service{
        use                             local-service         
        host_name                       xi_gua.example.com
        service_description             根分区
        check_command                   check_nrpe!check_disk
        }
define service{
        use                             local-service         
        host_name                       xi_gua.example.com
        service_description             登录用户数
        check_command                   check_nrpe!check_users
        }
监控根分区和登录人数

/usr/local/nagios/bin/nagios -v/usr/local/nagios/etc/nagios.cfg 
/etc/init.d/nagios reload                                                                  
如图可见监控成功

9.nagios的110云报警
到onealter官网下载所用的软件包这里用的是
alert-agent-4.1.3.1-linux-x64.tar.gz
在onealter网页添加nagios应用


获取应用key

在xi_gua.example.com主机中：
tar zxf alert-agent-4.1.3.1-linux-x64.tar.gz  
cp -R alert-agent /usr/local/nagios/libexec/  #将解压好的包放入nagios插件目录中
cp alert-agent/plugin/nagios-plugin/nagios /usr/local/nagios/libexec/
chmod +x /usr/local/nagios/libexec/nagios
cp alert-agent/plugin/nagios-plugin/110monitor.cfg/usr/local/nagios/etc/objects/   #将110配置文件放入nagios配置文件目录
在110monitor.cfg文件中添加Key：



修改/usr/local/nagios/etc/objects/contacts.cfg，新增110monitor到默认联系组
    define contactgroup{
    contactgroup_name       admins
    alias                   Nagios Administrators
    members                 nagiosadmin,110monitor
    }   
修改/usr/local/nagios/etc/nagios.cfg，将110monitor.cfg新增到nagios.cfg中
cfg_file=/usr/local/nagios/etc/objects/110monitor.cfg
/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

/etc/init.d/nagios   reload    

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