Nagios监控搭建

测试环境
主监控机：CentOS 7.5 192.168.131.10
被监控机：CentOS 6.2 192.168.131.20
安装包：nagios-3.5.1.tar.gz
nrpe-2.15.tar.gz
nagios-plugins-2.1.1.tar.gz 
主机:192.168.131.10配置
1.安装依赖包
yum install -y gcc glibc glibc-common php gd gd-devel libpng libmng libjpeg zlib
systemctl start httpd
2.添加nagios用户
useradd nagios
groupadd nagcmd
usermod -G nagcmd apache
3.二进制包安装nagios
mkdir /opt/nagios
tar zxvf nagios-3.5.1.tar.gz -C /opt/nagios
cd /opt/nagios
./configure  --with-command-group=nagcmd
make all
make install && make install-init && make install-commandmode && make install-config && make install-webconf 

//make install #安装生成/usr/local/nagios/，其中/usr/local/nagios/share即nagiosWEB 访问界面的站点目录
//make install-init                #安装生成/etc/rc.d/init.d/nagios  启动脚本
//make install-config                  #安装生成/usr/local/nagios/etc下的nagios相关配置文件
//make install-commandmode   #设定相应nagios工作目录的权限
//make install-webconf               #安装Nagios的WEB配置文件到Apache的conf.d目录下
认识一下nagios的配置文件
vim /usr/local/nagios/etc/nagios.cfg
*logfile=/var/log/nagios/nagios.log                        #日志位置
cfgfile=/etc/nagios/objects/commands.cfg          #这个文件定义了很多命令
cfgfile=/etc/nagios/objects/contacts.cfg                   #定义联系人，怎么联系
cfgfile=/etc/nagios/objects/timeperiods.cfg                #定义了时间段
cfgfile=/etc/nagios/objects/templates.cfg                  #模板（联系人，主机，时间）
cfgfile=/etc/nagios/objects/localhost.cfg                  #监控本机相关配置文件
#cfgfile=/etc/nagios/objects/windows.cfg                   #windows，默认不监控
#cfgfile=/etc/nagios/objects/switch.cfg                    #交换机路由器监控，默认不监控
#cfgfile=/etc/nagios/objects/printer.cfg                   #打印机监控，默认不监控
 
#cfgdir=/etc/nagios/servers                                #定义了服务合集（多个使用）
#cfgdir=/etc/nagios/printers                               #定义了打印机合集（多个使用）
#cfgdir=/etc/nagios/switches                               #定义了交换合集（多个使用）
#cfgdir=/etc/nagios/routers                                #定义了路由合集（多个使用） 
resourcefile=/etc/nagios/private/resource.cfg 资源变量配置文件，包括$USER1$变量（一个路径）等
statusupdateinterval=10                                   #状态更新时间，单位s
logrotationmethod=d                                       #日志滚动，默认天
servicechecktimeout=60                                    #服务检查超时时间
hostchecktimeout=30                                   #主机检查超时时间
eventhandlertimeout=30                               
notificationtimeout=30
ocsptimeout=5
perfdatatimeout=5**

vim /usr/local/nagios/etc/cgi.cfg
//此配置文件比nagios.cfg优先级高
main_config_file= /usr/local/nagios/etc/nagios.cfg             #主配置文件
physical_html_path= /usr/local/nagios/share          #物理路径
url_html_path=/nagios                               #在URL后面加上/nagios才能访问
use_authentication=1                                #使用认证
use_ssl_authentication=0                          #不使用ssl
authorized_for_system_information=nagiosadmin       #认证用户

Nagios访问测试
systemctl restart httpd
访问地址
http://192.168.131.10/nagios
提示需要账户和密码
vi /etc/httpd/conf.d/nagios.conf

htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
systemctl restart httpd 
通过-v参数检测配置文件是否有问题
/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

两者参数都为0，表示没有错误，以守护进程方式启动
/usr/local/nagios/bin/nagios -d /usr/local/nagios/etc/nagios.cfg
安装nagios-plugins插件
为了能够监控mysql，我们要在主监控机上安装mysql客户端
yum install mysql mysql-devel
tar xvf nagios-plugins-2.1.1.tar.gz -C /opt/nagios
cd /opt/nagios/nagios-plugins-2.1.1
./configure --with-nagios-user=nagios --with-nagios-group=nagcmd
make && make install
重启nagios
systemctl restart httpd; /etc/init.d/nagios restart
浏览器测试：登陆之后，点击hosts，可以看到，默认监控的是本机，说明环境
nagios监控本机服务器
监控本地nfs状态
yum -y install nfs-utils
cd /usr/local/nagios/etc/objects
vi localhost.cfg

*define service{
        use                             local-service        
        hostname                       localhost
        servicedescription             NFS
        checkcommand                   checktcp!2049
        }

    #在使用check命令之前，要确保下/usr/local/nagios/libexec/  目录下有没有你需要的check命令，如果有，直接调用，如果没有，检测端口来代替，检测格式：  checktcp!端口号*

重启nagios
/etc/init.d/nagios restart

修改主题的话 把相应主题包解压到 /usr/local/nagios/share/目录下，重启nagios就可以生效
unzip vautour_style.zip -d /usr/local/nagios/share/
nagios监控远程mysql
在主监控机192.168.131.10上配置nagios服务
vi /usr/local/nagios/etc/nagios.cfg

cfgfile=/usr/local/nagios/etc/objects/localhost.cfg          
 #在这两行下面添加下面两行
cfgfile=/usr/local/nagios/etc/objects/hosts.cfg
cfgfile=/usr/local/nagios/etc/objects/service.cfg

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

define host{
use linux-server #使用的模板名字
hostname sep-mysql #主机名
address 192.168.131.20 #IP地址
}    

vi /usr/local/nagios/etc/objects/service.cfg

define service{
        use       local-service
        hostname         sep-mysql
        servicedescription    MySqlSev
        checkcommand       checkmysql
}   

vi /usr/local/nagios/etc/objects/commands.cfg

define command{
        commandname    checkmysql
        commandline    $USER1$/checkmysql -H $HOSTADDRESS$ -u nagios –p123456 -d nagios
}
本机通过该命令测试
/usr/local/nagios/libexec/check_mysql -H192.168.131.20 -unagios -p123456 -d nagios

通过nrpe监控外部主机私有信息
客户端的NRPE安装
       1：安装nagios- plugins插件
       2：安装NRPE（ make install-daemon-config  make install-xinetd）
       3：配置我们xinted服务，允许谁来拿数据
       4：启动xinetd
       5：查看端口是否正常启动
解决依赖 监控机和被监控机都安装
yum install -y openssl openssl-devel

服务端安装NRPE
tar xvf nrpe-2.15.tar.gz -C /opt/nagios
cd /opt/nagios/nrpe-2.15/
./configure && make && make install
make install-plugin && make install-daemon
                                                       #前者安装插件，后者以守护经常来运行
ls /usr/local/nagios/libexec/check_nrpe  #这个命令需要安装nrpe之后才有
客户端配置
useradd -s /sbin/nologin nagios
groupadd nagcmd
usermod -G nagcmd nagios
yum install -y xinetd
tar xvf nagios-plugins-2.1.1.tar.gz -C /opt/nagios
tar xvf nrpe-2.15.tar.gz -C /opt/nagios
cd /opt/nagios/nagios-plugins-2.1.1/
./configure && make && make install
cd ../nrpe-2.15/
./configure && make && make install
make install-daemon-config         //这里是客户端，不用make-install-plugin
make install-xinetd
vim /etc/xinetd.d/nrpe

service nrpe
{
        flags           = REUSE
        socket_type     = stream
        port            =5666
        wait            = no
        user            = nagios
        group           = nagios
        server          =/usr/local/nagios/bin/nrpe
        server_args     = -c /usr/local/nagios/etc/nrpe.cfg --inetd
        log_on_failure  += USERID
        disable         = no
        only_from       =127.0.0.1 192.168.131.10      
 
}
echo "nrpe 5666/tcp # NRPE" >> /etc/services               //端口注册
netstat -antup | grep 5666
tcp        0      0:::5666                     :::*                LISTEN      68667/xinetd 
客户端nrpe命令
vim /usr/local/nagios/etc/nrpe.cfg
command[check_sdc1]=/usr/local/nagios/libexec/check_disk -w 38% -c 35% -p /dev/sdc1
#-w为警告 -C为告急  
systemctl restart xinetd

服务端手动测试

/usr/local/nagios/libexec/check_nrpe -H192.168.131.20
NRPE v2.15
[root@xuegod63 ~]# /usr/local/nagios/libexec/check_nrpe -H192.168.131.20 -c check_sdc1

定义被监控主机
cd /usr/local/nagios/etc/objects/
vim hosts.cfg
define host{
        use          linux-server
        host_name      sep-mysql
        address        192.168.131.20
}

定义需要监控的服务
[root@xuegod63 objects]# vim service.cfg
define service{
use local-service
host_name sep-mysql
service_description sdac_Partition
check_command check_nrpe!check_sdc1
}

定义NRPE监控命令

vim commands.cfg
define command{
        command_name    check_nrpe
        command_line    $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
        }
$ARG1$ 表示调用后面的参数。

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