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Nagios监控lvs服务

原创 Linux操作系统 作者:mchdba 时间:2014-06-19 15:04:35 0 删除 编辑

 1在lvs 服务器上安装nrpe客户端:

1.1rpm方式安装nrpe客户端

下载地址:http://download.csdn.net/detail/mchdba/7493875


  1. [root@localhost nagios]# ll
  2. 总计 768
  3. -rw-r--r-- 1 root root 713389 12-16 12:08 nagios-plugins-1.4.11-1.x86_64.rpm
  4. -rw-r--r-- 1 root root 32706 12-16 12:09 nrpe-2.12-1.x86_64.rpm
  5. -rw-r--r-- 1 root root 18997 12-16 12:08 nrpe-plugin-2.12-1.x86_64.rpm
  6. [root@localhost nagios]# rpm -ivh *.rpm --nodeps --force

1.2 在配置文件最末尾,添加配置信息以及监控主机服务器ip地址


  1. [root@ localhost nagios]# vim /etc/nagios/nrpe.cfg
  2. # add by tim on 2014-06-11
  3. command[check_users]=/usr/local/nagios/libexec/check_users -w 8 -c 15
  4. command[check_load]=/usr/local/nagios/libexec/check_load -w 15,10,5 -c 30,25,20
  5. command[check_sda1]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /dev/sda
  6. command[check_zombie_procs]=/usr/local/nagios/libexec/check_procs -w 5 -c 10 -s Z
  7. #command[check_total_procs]=/usr/local/nagios/libexec/check_procs -w 50 -c 80
  8. command[check_total_procs]=/usr/local/nagios/libexec/check_procs -w 750 -c 800
  9. command[check-host-alive]=/usr/local/nagios/libexec/check_ping -H localhost -w 3000.0,80% -c 5000.0,100% -p 5
  10. allowed_hosts = 127.0.0.1, 10.2xx.3.xx

check下命令是否生效:


  1. [root@web-9 nrpe-2.15]# /usr/local/nagios/libexec/check_users -w 8 -c 15
  2. USERS OK - 2 users currently logged in |users=2;8;15;0
  3. [root@web-9 nrpe-2.15]#

看到已经USERS OK -….命令已经生效。

 

1.3 启动nrpe报错如下:


  1. [root@web-9 ~]# service nrpe restart
  2. Shutting down nrpe: [失败]
  3. Starting nrpe: /usr/sbin/nrpe: error while loading shared libraries: libssl.so.6: cannot open shared object file: No such file or directory
  4.                                                            [失败]
  5. [root@web-9 ~]#
  6. [root@db-m2-slave-1 nagios_client]# service nrpe start
  7. Starting nrpe: /usr/sbin/nrpe: error while loading shared libraries: libssl.so.6: cannot open shared object file: No such file or directory
  8.                                                            [失败]
  9. [root@db-m2-slave-1 nagios_client]#

建立连接

[root@db-m2-slave-1 nagios_client]# ln -s /usr/lib64/libssl.so /usr/lib64/libssl.so.6

 (如果没有libssl.so,就采用别的libssl.so.10来做软连接,ln -s /usr/lib64/libssl.so.10 /usr/lib64/libssl.so.6)

[root@db-m2-slave-1 nagios_client]#

再重新启动如下:


  1. [root@db-m2-slave-1 nagios_client]# service nrpe start
  2. Starting nrpe: /usr/sbin/nrpe: error while loading shared libraries: libcrypto.so.6: cannot open shared object file: No such file or directory
  3.                                                            [失败]
  4. [root@web-10 ~]# ll /usr/lib64/libcrypto.so
  5. lrwxrwxrwx. 1 root root 18 10月 13 2013 /usr/lib64/libcrypto.so -> libcrypto.so.1.0.0
  6. [root@db-m2-slave-1 nagios_client]#

再建链接:

  1. [root@db-m2-slave-1 nagios_client]# ln -s /usr/lib64/libcrypto.so /usr/lib64/libcrypto.so.6
  2. (或者如果没有libcrypto.so,就采用libcrypto.so.10做软连接, ln -s /usr/lib64/libcrypto.so.10 /usr/lib64/libcrypto.so.6)
  3. [root@db-m2-slave-1 nagios_client]# service nrpe start
  4. Starting nrpe: [确定]
  5. [root@db-m2-slave-1 nagios_client]#

1.4 检测下nrpe是否正常运行:


  1. 去nagios服务器端check下
  2. [root@cache-2 ~]# /usr/local/nagios/libexec/check_nrpe -H xx.xx3.xx
  3. NRPE v2.12
  4. [root@cache-2 ~]#

看到返回NRPE v2.15表示已经连接成功。

 

2 编写shell脚本实现lvs监控

2.1 监控脚本
Nagios里面没有现成的监控lvs的状态脚本,所以需要去网上找一个简单的监控脚本check_lvs.shcopy/usr/lib/nagios/plugins/目录,赋予nagios权限,脚本内容如下:

  1. #!/bin/bash
  2. # http://www.ohlinux.com/archives/632/
  3. # add by tim on 20140613
  4. USAGE_Method=\"$(basename $0)[-h|--hostname] [-w|--warning] [-c|--critical] \"
  5. USAGE_Value=\"warning value must be small than critical value: `basename $0` $*\"
  6. STATE_OK=0
  7. STATE_WARNING=1
  8. STATE_CRITICAL=2
  9. STATE_UNKNOWN=3

  10. if [ $# -lt 4 ];then
  11.     echo
  12.     echo \"Usage: $USAGE_Method\"
  13.     echo
  14.     exit 0
  15. fi
  16. while [ $# -gt 0 ];
  17. do
  18.     case \"$1\" in
  19.     -w|--warning)
  20.     shift
  21.     warning=$1
  22.     ;;
  23.     -c|--critical)
  24.     shift
  25.     critical=$1
  26.     ;;
  27.     esac
  28.     shift
  29. done


  30. if [[ $warning == $critical || $warning -gt $critical ]]
  31. then
  32.     #echo $warning
  33.     #echo $critical
  34.     echo \"$USAGE_Value\"
  35.     echo \"Usage: $USAGE_Method\"
  36.     exit 0
  37. fi


  38. ACT_COUNT=0
  39. Inactive_count=0
  40. stat1=`sudo ipvsadm | grep http | grep Route|wc -l`
  41. if [ $stat1 -ne 0 ];then
  42.     for NUM in `sudo ipvsadm | grep http | grep Route | awk \'{print $5}\'`
  43.     do
  44.          ACT_COUNT=$(($ACT_COUNT+ $NUM))
  45.     done
  46.     for NUM in `sudo ipvsadm | grep http | grep Route | awk \'{print $6}\'`
  47.     do
  48.         Inactive_count=$(($Inactive_count+ $NUM))
  49.     done
  50. else
  51.     echo \" stat1:$stat1, lvs critical,lvs is down now.\"
  52.     exit 3
  53. fi



  54. if [[ \"$ACT_COUNT\" -gt \"$critical\" ]]
  55. then
  56.     echo \"critical - lvs connetion is : $ACT_COUNT active\"
  57.     exit 2
  58. fi
  59. if [[ \"$ACT_COUNT\" -gt \"$warning\" && \"$ACT_COUNT\" -lt \"$critical\" ]]
  60. then
  61.     echo \"warning - lvs connetions is : $ACT_COUNT active\"
  62.     exit 1
  63. fi
  64. if [[ \"$ACT_COUNT\" -lt \"$warning\" || $ACT_COUNT == 0 ]]
  65. then
  66.     echo \"LVS OK - LVS is running (conn: $ACT_COUNT active, $Inactive_count inactive)|active=$ACT_COUNT;69999;99999;0; inactive=$Inactive_count;69999;99999;0;\"
  67.     exit 0
  68. fi


2.2 nrpe.cfg里面配置如下

Vim /etc/nagios/nrpe.cfg,在里面添加一行check_lvs命令:

command[check_lvs]=/usr/lib/nagios/plugins/check_lvs -w 300 -c 600 

之后重启nrpe


点击(此处)折叠或打开

  1. [root@/root/nagios/check_lvs ~]# service nrpe restart;
  2. Shutting down nrpe: [确定]
  3. Starting nrpe: [确定]
  4. [root@/root/nagios/check_lvs ~]#

2.3 nagios服务端check一下


  1. [root@cache-2 ~]# /usr/local/nagios/libexec/check_nrpe -H 1x.xx4.x.x5 -c check_lvs
  2.  lvs critical,lvs is down now.
  3. [root@cache-2 ~]#

看到check出来lvs服务已经处于down模式。

说明:由于check_lvs是要调用ipvsadm命令来获取LVS状态的,而ipvsadm命令是只能以root用户来运行的, 所以需要将nagios用户设置成可以无需密码直接su成root,这样就能以nagios用户运行命令sudo /usr/lib/nagios/plugins/check_lvs 。在centos系统中,无法直接调用sudo命令,需要修改/etc/sudoers, 找到 #Defaults requiretty 并取消注释,另外新增一行。表示nagios用户不需要登陆终端就可以调用命令,如下所示:

Defaults    requiretty

Defaults:nagios    !requiretty

#添加nagios 请求sudo,允许特定指令时(可跟参数),不需要密码(如)。

nagios ALL=(ALL) NOPASSWD: ALL

 

 再去nagios服务器上面check下:

  1. [root@cache-2 etc]# /usr/local/nagios/libexec/check_nrpe -H 10.xx.xx.xx -c check_lvs
  2. LVS OK - LVS is running (conn: 16 active, 77 inactive)|active=16;69999;99999;0; inactive=77;69999;99999;0;
  3. [root@cache-2 etc]#
已经能成功check了。

 

2.4 nagios服务器上添加配置

  1. vim services.cfg
  2. define service{
  3.         host_name lvs-lan
  4.         service_description Check lvs
  5.         check_command check_nrpe!check_lvs
  6.         max_check_attempts 5
  7.         normal_check_interval 3
  8.         retry_check_interval 2
  9.         check_period 24x7
  10.         notification_interval 10
  11.         notification_period 24x7
  12.         notification_options w,c,r
  13.         contact_groups opsweb
  14.         }
  15. vim objects/commands.cfg
  16. define command{
  17.         command_name check_lvs
  18.         command_line $USER1$/check_lvs -H $HOSTADDRESS$ -w $ARG1$ -c $ARG2$
  19.         }

之后重新加载nagios既完成了对lvs的监控服务。

  1. [root@cache-2 etc]# service nagios reload
  2. Running configuration check...
  3. Reloading nagios configuration...
  4. done
  5. [root@cache-2 etc]#

 至此,nagios下面对lvs服务的监控已经完成。

 

参考资料:http://c20031776.blog.163.com/blog/static/684716252013627506890/

来自 “ ITPUB博客 ” ,链接:http://blog.itpub.net/26230597/viewspace-1189081/,如需转载,请注明出处,否则将追究法律责任。

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