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
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[root@localhost nagios]# ll
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总计 768
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-rw-r--r-- 1 root root 713389 12-16 12:08 nagios-plugins-1.4.11-1.x86_64.rpm
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-rw-r--r-- 1 root root 32706 12-16 12:09 nrpe-2.12-1.x86_64.rpm
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-rw-r--r-- 1 root root 18997 12-16 12:08 nrpe-plugin-2.12-1.x86_64.rpm
- [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
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[root@ localhost nagios]# vim /etc/nagios/nrpe.cfg
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# add by tim on 2014-06-11
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command[check_users]=/usr/local/nagios/libexec/check_users -w 8 -c 15
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command[check_load]=/usr/local/nagios/libexec/check_load -w 15,10,5 -c 30,25,20
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command[check_sda1]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /dev/sda
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command[check_zombie_procs]=/usr/local/nagios/libexec/check_procs -w 5 -c 10 -s Z
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#command[check_total_procs]=/usr/local/nagios/libexec/check_procs -w 50 -c 80
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command[check_total_procs]=/usr/local/nagios/libexec/check_procs -w 750 -c 800
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command[check-host-alive]=/usr/local/nagios/libexec/check_ping -H localhost -w 3000.0,80% -c 5000.0,100% -p 5
- allowed_hosts = 127.0.0.1, 10.2xx.3.xx
check下命令是否生效:
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[root@web-9 nrpe-2.15]# /usr/local/nagios/libexec/check_users -w 8 -c 15
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USERS OK - 2 users currently logged in |users=2;8;15;0
- [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:
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[root@web-9 ~]# service nrpe restart
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Shutting down nrpe: [失败]
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Starting nrpe: /usr/sbin/nrpe: error while loading shared libraries: libssl.so.6: cannot open shared object file: No such file or directory
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[失败]
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[root@web-9 ~]#
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[root@db-m2-slave-1 nagios_client]# service nrpe start
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Starting nrpe: /usr/sbin/nrpe: error while loading shared libraries: libssl.so.6: cannot open shared object file: No such file or directory
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[失败]
- [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:
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[root@db-m2-slave-1 nagios_client]# service nrpe start
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Starting nrpe: /usr/sbin/nrpe: error while loading shared libraries: libcrypto.so.6: cannot open shared object file: No such file or directory
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[失败]
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[root@web-10 ~]# ll /usr/lib64/libcrypto.so
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lrwxrwxrwx. 1 root root 18 10月 13 2013 /usr/lib64/libcrypto.so -> libcrypto.so.1.0.0
- [root@db-m2-slave-1 nagios_client]#
再建链接:
1.4 检测下nrpe是否正常运行:
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去nagios服务器端check下
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[root@cache-2 ~]# /usr/local/nagios/libexec/check_nrpe -H xx.xx3.xx
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NRPE v2.12
- [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:
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#!/bin/bash
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# http://www.ohlinux.com/archives/632/
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# add by tim on 20140613
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USAGE_Method=\"$(basename $0)[-h|--hostname]
[-w|--warning] [-c|--critical] \"
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USAGE_Value=\"warning value must be small than critical value: `basename $0` $*\"
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STATE_OK=0
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STATE_WARNING=1
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STATE_CRITICAL=2
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STATE_UNKNOWN=3
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if [ $# -lt 4 ];then
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echo
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echo \"Usage: $USAGE_Method\"
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echo
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exit 0
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fi
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while [ $# -gt 0 ];
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do
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case \"$1\" in
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-w|--warning)
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shift
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warning=$1
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;;
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-c|--critical)
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shift
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critical=$1
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;;
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esac
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shift
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done
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-
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if [[ $warning == $critical || $warning -gt $critical ]]
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then
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#echo $warning
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#echo $critical
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echo \"$USAGE_Value\"
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echo \"Usage: $USAGE_Method\"
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exit 0
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fi
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ACT_COUNT=0
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Inactive_count=0
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stat1=`sudo ipvsadm | grep http | grep Route|wc -l`
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if [ $stat1 -ne 0 ];then
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for NUM in `sudo ipvsadm | grep http | grep Route | awk \'{print $5}\'`
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do
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ACT_COUNT=$(($ACT_COUNT+ $NUM))
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done
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for NUM in `sudo ipvsadm | grep http | grep Route | awk \'{print $6}\'`
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do
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Inactive_count=$(($Inactive_count+ $NUM))
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done
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else
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echo \" stat1:$stat1, lvs critical,lvs is down now.\"
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exit 3
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fi
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if [[ \"$ACT_COUNT\" -gt \"$critical\" ]]
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then
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echo \"critical - lvs connetion is : $ACT_COUNT active\"
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exit 2
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fi
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if [[ \"$ACT_COUNT\" -gt \"$warning\" && \"$ACT_COUNT\" -lt \"$critical\" ]]
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then
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echo \"warning - lvs connetions is : $ACT_COUNT active\"
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exit 1
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fi
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if [[ \"$ACT_COUNT\" -lt \"$warning\" || $ACT_COUNT == 0 ]]
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then
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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;\"
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exit 0
- 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
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[root@/root/nagios/check_lvs ~]# service nrpe restart;
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Shutting down nrpe: [确定]
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Starting nrpe: [确定]
- [root@/root/nagios/check_lvs ~]#
2.3 去nagios服务端check一下
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[root@cache-2 ~]# /usr/local/nagios/libexec/check_nrpe -H 1x.xx4.x.x5 -c check_lvs
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lvs critical,lvs is down now.
- [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:
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[root@cache-2 etc]# /usr/local/nagios/libexec/check_nrpe -H 10.xx.xx.xx -c check_lvs
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LVS OK - LVS is running (conn: 16 active, 77 inactive)|active=16;69999;99999;0; inactive=77;69999;99999;0;
- [root@cache-2 etc]#
2.4 在nagios服务器上添加配置
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vim services.cfg
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define service{
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host_name lvs-lan
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service_description Check lvs
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check_command check_nrpe!check_lvs
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max_check_attempts 5
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normal_check_interval 3
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retry_check_interval 2
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check_period 24x7
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notification_interval 10
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notification_period 24x7
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notification_options w,c,r
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contact_groups opsweb
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}
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vim objects/commands.cfg
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define command{
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command_name check_lvs
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command_line $USER1$/check_lvs -H $HOSTADDRESS$ -w $ARG1$ -c $ARG2$
- }
之后重新加载nagios既完成了对lvs的监控服务。
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[root@cache-2 etc]# service nagios reload
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Running configuration check...
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Reloading nagios configuration...
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done
- [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/