Debian 系统安装 Nagios 服务器监控端

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• 　　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" "$LASTHOSTCHECK$\t$HOSTNAME$\t$HOSTSTATE$\t$HOSTATTEMPT$\t$HOSTSTATETYPE$\t$HOSTEXECUTIONTIME$\t$HOSTOUTPUT$\t$HOSTPERFDATA$\n" >> /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" "$LASTSERVICECHECK$\t$HOSTNAME$\t$SERVICEDESC$\t$SERVICESTATE$\t$SERVICEATTEMPT$\t$SERVICESTATETYPE$\t$SERVICEEXECUTIONTIME$\t$SERVICELATENCY$\t$SERVICEOUTPUT$\t$SERVICEPERFDATA$\n" >> /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