Debian 系统安装 Nagios 服务器监控端

安装
apt-get update
apt-get install nagios* perl
apt-get install --no-install-recommends pnp4nagios
apt-get install apache2 apache2-utils php5 php-pear
修改npcd设置
# vim /etc/default/npcd
Run="yes"
# service npcd start
添加process_perfdata.pl执行权限
chmod +x /usr/lib/pnp4nagios/libexec/process_perfdata.pl

修改commands.cfg设置(注释旧命令)
vi /etc/nagios3/commands.cfg

# 'process-host-perfdata' command definition
define command{
   command_name   process-host-perfdata
   #command_line   /usr/bin/printf "%b" "$LASTHOSTCHECK$	$HOSTNAME$	$HOSTSTATE$	$HOSTATTEMPT$	$HOSTSTATETYPE$	$HOSTEXECUTIONTIME$	$HOSTOUTPUT$	$HOSTPERFDATA$
" >> /var/lib/nagios3/host-perfdata.out
   command_line   /usr/bin/perl /usr/lib/pnp4nagios/libexec/process_perfdata.pl
   }


# 'process-service-perfdata' command definition
define command{
   command_name   process-service-perfdata
   #command_line   /usr/bin/printf "%b" "$LASTSERVICECHECK$	$HOSTNAME$	$SERVICEDESC$	$SERVICESTATE$	$SERVICEATTEMPT$	$SERVICESTATETYPE$	$SERVICEEXECUTIONTIME$	$SERVICELATENCY$	$SERVICEOUTPUT$	$SERVICEPERFDATA$
" >> /var/lib/nagios3/service-perfdata.out
   command_line   /usr/bin/perl /usr/lib/pnp4nagios/libexec/process_perfdata.pl
   }

commands.cfg Code

修改nagios.cfg配置
vi /etc/nagios3/nagios.cfg 修改以下3行配置
process_performance_data=1
host_perfdata_command=process-host-perfdata
service_perfdata_command=process-service-perfdata
修改check_external_commands=1 (未修改可能导致web网站无法Re-schedule监控项)
修改enable_flap_detection=0 (虽然文档里说默认是0，但实际为1.改为0之后就解决了flapping state)
修改services_nagios2.cfg配置
vi /etc/nagios3/conf.d/services_nagios2.cfg
notification_interval 1
vi /etc/nagios3/conf.d/generic-service_nagios2.cfg
notification_interval 1
删除install.php
# cd /usr/share/pnp4nagios/html
# mv install.php install.php.bak
Nagios插件目录: /usr/lib/nagios/plugins/

添加pnp4nagios插件
vi /etc/nagios3/conf.d/pnp4nagos.cfg 追加如下配置

define host {
        name       host-pnp
        action_url /pnp4nagios/index.php/graph?host=$HOSTNAME$'class='tips'rel='/pnp4nagios/index.php/popup?host=$HOSTNAME$&srv=_HOST_
        register   0
        process_perf_data       1
}

define service {
        name       srv-pnp
        action_url /pnp4nagios/index.php/graph?host=$HOSTNAME$&srv=$SERVICEDESC$'class='tips'rel='/pnp4nagios/index.php/popup?host=$HOSTNAME$&srv=$SERVICEDESC$
        register   0
        process_perf_data       1
}

Code

默认是没有监控内存的，若需要监控复制check_mem.sh文件到插件目录，再添加相关配置文件
添加自定义执行命令
vi /etc/nagios3/conf.d/custom_commond.cfg

define command{
        command_name        check_mem
        command_line        $USER1$/check_mem.sh -w $ARG1$ -c $ARG2$
        }

Code

添加本机的check_mem服务
vi /etc/nagios3/conf.d/localhost_nagios2.cfg 添加如下配置

define service{
        use                             local-service,srv-pnp
        host_name                       localhost
        service_description             check_mem
        check_command                   check_mem!80!90
        }

Code

监控服务器网卡流量
apt-get install snmpd snmp-mibs-downloader
vi /etc/snmp/snmpd.conf（可备份snmpd.conf,修改下面的localhost－IP为服务器IP，保存此文件即可）

com2sec notConfigUser 127.0.0.1 public 
com2sec notConfigUser localhost-IP public 

group notConfigGroup v1 notConfigUser 
group notConfigGroup v2c notConfigUser 

view systemview included .1.3.6.1.2.1.1 
view systemview included .1.3.6.1.2.1.2 
view systemview included .1.3.6.1.2.1.25.1.1 
view all included .1 

access notConfigGroup "" any noauth exact all none none

Code

重启snmpd服务
下载check_traffic.sh到插件目录
cd /usr/lib/nagios/plugins/
测试执行
./check_traffic.sh -V 2c -C public -H your_ip -I 2 -w 1200,1500 -c 1700,1800 -K -B
# vi /etc/nagios3/conf.d/custom_commond.cfg 追加

define command{
        command_name    check_traffic
        command_line    $USER1$/check_traffic.sh -V 2c -C public -H $HOSTADDRESS$ -I $ARG1$ -w $ARG2$ -c $ARG3$ -M -b
}

Code

当服务停止时重新监控失败，运行以下2行命令
# dpkg-statoverride --update --add nagios www-data 2710 /var/lib/nagios3/rw
# dpkg-statoverride --update --add nagios www-data 751 /var/lib/nagios3
配置发送邮件功能
apt-get install ssmtp (备用：apt-get install sendmail-bin sendmail)
修改ssmpt.conf文件配置
# vi /etc/ssmtp/ssmtp.conf 追加Google邮箱配置方式(勿开启2步验证)
```
AuthUser=NagiosAdmin
AuthPass=PassWord
FromLineOverride=YES
mailhub=smtp.gmail.com:587
UseSTARTTLS=YES
```
Code
service sendmail stop
chkconfig sendmail off
cd /usr/sbin
mv sendmail sendmail.bak
ln -s /usr/sbin/ssmtp /usr/sbin/sendmail
测试发邮件即可

添加被监控机需要注意
监控其他主机，需要添加check_nrpe命令，但在Debian系统中，添加check_nrpe命令会提示重复，但是却找不到其他地方有配置。
所以需要将check_nrpe改成其他名

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

Code

举例监控客户机的CPU情况
先添加主机
# vi /etc/nagios3/conf.d/hosts.cfg

define host{
    use                             generic-host               ; Inherit default values from a template
    host_name                       Dow1_Server                  ; The name we're giving to this server
    alias                           DriverServer               ; A longer name for the server
    address                         10.10.0.32            ; IP address of Remote Linux host
}

Code

添加监控服务项，注意使用的命令是自定义的nrpe
# vi /etc/nagios3/conf.d/custom_services.cfg

define service{
        use                     generic-service
        host_name               Dow1_Server_198.27.75.32
        service_description     CPU Load
        check_command           custom_check_nrpe!check_load
        }

Code

iptables -A INPUT -p tcp -m tcp --dport 5666 -j ACCEPT
service iptables save
service iptables restart