Nagios 监控 lvs服务

 1在lvs 服务器上安装nrpe客户端：

1.1，rpm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.sh，copy到/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. 
    
11. if [ $# -lt 4 ];then
    
12.     echo
    
13.     echo \"Usage: $USAGE_Method\"
    
14.     echo
    
15.     exit 0
    
16. fi
    
17. while [ $# -gt 0 ];
    
18. do
    
19.     case \"$1\" in
    
20.     -w|--warning)
    
21.     shift
    
22.     warning=$1
    
23.     ;;
    
24.     -c|--critical)
    
25.     shift
    
26.     critical=$1
    
27.     ;;
    
28.     esac
    
29.     shift
    
30. done
    
31. 
    
32. 
    
33. if [[ $warning == $critical || $warning -gt $critical ]]
    
34. then
    
35.     #echo $warning
    
36.     #echo $critical
    
37.     echo \"$USAGE_Value\"
    
38.     echo \"Usage: $USAGE_Method\"
    
39.     exit 0
    
40. fi
    
41. 
    
42. 
    
43. ACT_COUNT=0
    
44. Inactive_count=0
    
45. stat1=`sudo ipvsadm | grep http | grep Route|wc -l`
    
46. if [ $stat1 -ne 0 ];then
    
47.     for NUM in `sudo ipvsadm | grep http | grep Route | awk \'{print $5}\'`
    
48.     do
    
49.          ACT_COUNT=$(($ACT_COUNT+ $NUM))
    
50.     done
    
51.     for NUM in `sudo ipvsadm | grep http | grep Route | awk \'{print $6}\'`
    
52.     do
    
53.         Inactive_count=$(($Inactive_count+ $NUM))
    
54.     done
    
55. else
    
56.     echo \" stat1:$stat1, lvs critical,lvs is down now.\"
    
57.     exit 3
    
58. fi
    
59. 
    
60. 
    
61. 
    
62. if [[ \"$ACT_COUNT\" -gt \"$critical\" ]]
    
63. then
    
64.     echo \"critical - lvs connetion is : $ACT_COUNT active\"
    
65.     exit 2
    
66. fi
    
67. if [[ \"$ACT_COUNT\" -gt \"$warning\" && \"$ACT_COUNT\" -lt \"$critical\" ]]
    
68. then
    
69.     echo \"warning - lvs connetions is : $ACT_COUNT active\"
    
70.     exit 1
    
71. fi
    
72. if [[ \"$ACT_COUNT\" -lt \"$warning\" || $ACT_COUNT == 0 ]]
    
73. then
    
74.     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;\"
    
75.     exit 0
    
76. 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 去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 在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。