安装nagios检测hadoop

Nagios是常用的系统监控工具，提供了很多基本服务的监控脚本，如HTTP，MYSQL等，同时具有不错的可扩展性，自己可定制针对特定参数的监控脚本以及报警的方式.

我现在有三台机器：192.168.0.26   namenode2 主机

192.168.0.27    datanode1    从机

192.168.0.28    datanode2   从机

一.在机子上面安装nagios

1.先在主机上安装apache2   nagios3  nagios-nrpe-plugin这三个，apahce2有的话就不用安装了

sudo apt-get install apache2 nagios3 nagios-nrpe-plugin

在装的过程中，会让你设置nagios报警邮件，选择【Internet Site】，使用SMTP协议发送邮件

要求输入邮件服务器的域名，由于不需要搭建邮件服务器，直接点击【OK】

设置nagios web登陆密码

登陆nagios，http://192.168.0.26/nagios3 账号/密码:nagiosadmin/123456

2.sudo apt-get install nagios3-doc  可以在网页上看nagios的doc

3.在从机上面只需要安装nagios-nrpe-server

sudo apt-get install nagios-nrpe-server

4.启动nagios的命令：

sudo /etc/init.d/nagios3 start

5.cd /etc/nagios3

sudo nagios3 –v nagios.cfg

没有出现错误，一般在启动前，你想查看有没有错误信息，就可以用这个

二.配置检测其它机子

1.在/etc/nagios3/conf.d目录下创建要监控的主机文件hosts.cfg

sudo nano /etc/nagios3/conf.d/hosts.cfg,添加以下内容：

#add namenode2
define host{
        use                     generic-host           ; Name of host template to use
                                   ; This host definition will inherit all variables that are defined
                                   ; in (or inherited by) the linux-server host template definition.
        host_name               namenode2
        alias                   namenode2
        address                 192.168.0.26
        }

#add datanode1

define host{
        use                     generic-host            ; Name of host template to use
                                   ; This host definition will inherit all variables that are defined
                                   ; in (or inherited by) the linux-server host template definition.
        host_name               datanode1
        alias                   datanode1
        address                 192.168.0.27
        }
#add datanode2

define host{
        use                     generic-host            ; Name of host template to use
                                   ; This host definition will inherit all variables that are defined
                                   ; in (or inherited by) the linux-server host template definition.
        host_name               datanode2
        alias                   datanode2
        address                 192.168.0.28
        }

2.修改/etc/nagios3/conf.d目录下的hostgroups_nagios2.cfg文件，新增主机组，增加以下内容：

# Some generic hostgroup definitions

# A simple wildcard hostgroup
define hostgroup {
        hostgroup_name  all
        alias           All Servers
        members         *
        }

# A list of your Debian GNU/Linux servers
define hostgroup {
        hostgroup_name  debian-servers
        alias           Debian GNU/Linux Servers
        members         namenode2,datanode1,datanode2
        }

# A list of your web servers
define hostgroup {
        hostgroup_name  http-servers
        alias           HTTP servers
        members         namenode2,datanode1,datanode2
        }

# A list of your ssh-accessible servers
define hostgroup {
        hostgroup_name  ssh-servers
        alias           SSH servers
        members         namenode2,datanode1,datanode2
        }

修改完这2个以后，重启nagios

sudo /etc/init.d/nagios3 restart

输入用http://192.168.0.26/nagios3输入nagiosadmin密码，就进入nagios监控画面。