Nagios監控lvs服務

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 1在lvs 伺服器上安裝nrpe用戶端：

1.1，rpm方式安裝nrpe用戶端

：http://download.csdn.net/detail/mchdba/7493875

[[email protected] nagios]# ll總計 768-rw-r--r-- 1 root root 713389 12-16 12:08 nagios-plugins-1.4.11-1.x86_64.rpm-rw-r--r-- 1 root root  32706 12-16 12:09 nrpe-2.12-1.x86_64.rpm-rw-r--r-- 1 root root  18997 12-16 12:08 nrpe-plugin-2.12-1.x86_64.rpm[[email protected] nagios]# rpm -ivh *.rpm --nodeps  --force

 

1.2 在設定檔最末尾，添加配置資訊以及監控主機伺服器ip地址

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

check下命令是否生效：

[[email protected] nrpe-2.15]# /usr/local/nagios/libexec/check_users -w 8 -c 15USERS OK - 2 users currently logged in |users=2;8;15;0[[email protected] nrpe-2.15]#

看到已經USERS OK -….命令已經生效。

 

1.3 啟動nrpe報錯如下：

[[email protected] ~]# service nrpe restartShutting down nrpe:                                        [失敗]Starting nrpe: /usr/sbin/nrpe: error while loading shared libraries: libssl.so.6: cannot open shared object file: No such file or directory                                                           [失敗][[email protected] ~]#[[email protected] nagios_client]# service nrpe startStarting nrpe: /usr/sbin/nrpe: error while loading shared libraries: libssl.so.6: cannot open shared object file: No such file or directory                                                           [失敗][[email protected] nagios_client]#

建立串連

[[email protected] nagios_client]# ln -s /usr/lib64/libssl.so /usr/lib64/libssl.so.6 (如果沒有libssl.so，就採用別的libssl.so.10來做軟串連，ln -s /usr/lib64/libssl.so.10 /usr/lib64/libssl.so.6)[[email protected] nagios_client]#

再重新啟動如下：

[[email protected] nagios_client]# service nrpe startStarting nrpe: /usr/sbin/nrpe: error while loading shared libraries: libcrypto.so.6: cannot open shared object file: No such file or directory                                                           [失敗][[email protected] ~]# ll /usr/lib64/libcrypto.solrwxrwxrwx. 1 root root 18 10月 13 2013 /usr/lib64/libcrypto.so -> libcrypto.so.1.0.0[[email protected] nagios_client]#

再建連結：

[[email protected] nagios_client]# ln -s /usr/lib64/libcrypto.so /usr/lib64/libcrypto.so.6(或者如果沒有libcrypto.so，就採用libcrypto.so.10做軟串連， ln -s /usr/lib64/libcrypto.so.10 /usr/lib64/libcrypto.so.6)[[email protected] nagios_client]# service nrpe startStarting nrpe:                                             [確定][[email protected] nagios_client]#

 

1.4 檢測下nrpe是否正常運行：

去nagios伺服器端check下

[[email protected] ~]#  /usr/local/nagios/libexec/check_nrpe -H xx.xx3.xxNRPE v2.12[[email protected] ~]#

[[email protected] ~]#  /usr/local/nagios/libexec/check_nrpe -H xx.xx3.xx

NRPE v2.12

[[email protected] ~]#

看到返回NRPE v2.15表示已經串連成功。

 

2 編寫shell指令碼實現lvs監控

2.1 監控指令碼
Nagios裡面沒有現成的監控lvs的狀態指令碼，所以需要去網上找一個簡單的監控指令碼check_lvs.sh，copy到/usr/lib/nagios/plugins/目錄，賦予nagios許可權，指令碼內容如下：

#!/bin/bash # http://www.ohlinux.com/archives/632/# add by tim on 20140613USAGE_Method=\"$(basename $0)[-h|--hostname] <Free ip or hostname> [-w|--warning] <Free integer> [-c|--critical] <Free integer>\"USAGE_Value=\"warning value must be small than critical value: `basename $0` $*\"STATE_OK=0STATE_WARNING=1STATE_CRITICAL=2STATE_UNKNOWN=3if [ $# -lt 4 ];then    echo    echo \"Usage: $USAGE_Method\"    echo    exit 0fiwhile [ $# -gt 0 ];do    case \"$1\" in    -w|--warning)    shift    warning=$1    ;;    -c|--critical)    shift    critical=$1    ;;    esac    shiftdoneif [[ $warning == $critical || $warning -gt $critical ]]then    #echo $warning    #echo $critical    echo \"$USAGE_Value\"    echo \"Usage: $USAGE_Method\"    exit 0fiACT_COUNT=0Inactive_count=0stat1=`sudo ipvsadm | grep http | grep Route|wc -l`if [ $stat1 -ne 0 ];then    for NUM in `sudo ipvsadm | grep http | grep Route | awk \‘{print $5}\‘`    do         ACT_COUNT=$(($ACT_COUNT+ $NUM))    done    for NUM in `sudo ipvsadm | grep http | grep Route | awk \‘{print $6}\‘`    do        Inactive_count=$(($Inactive_count+ $NUM))    doneelse    echo \" stat1:$stat1, lvs critical,lvs is down now.\"    exit 3fiif [[ \"$ACT_COUNT\" -gt \"$critical\" ]]then    echo \"critical - lvs connetion is : $ACT_COUNT active\"    exit 2fiif [[ \"$ACT_COUNT\" -gt \"$warning\" && \"$ACT_COUNT\" -lt \"$critical\" ]]then    echo \"warning - lvs connetions is : $ACT_COUNT active\"    exit 1fiif [[ \"$ACT_COUNT\" -lt \"$warning\" || $ACT_COUNT == 0 ]]then    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;\"    exit 0fi

2.2 nrpe.cfg裡面配置如下

Vim /etc/nagios/nrpe.cfg，在裡面添加一行check_lvs命令：

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

之後重啟nrpe

[[email protected]/root/nagios/check_lvs ~]# service nrpe restart;Shutting down nrpe:                                        [確定]Starting nrpe:                                             [確定][[email protected]/root/nagios/check_lvs ~]#service nrpe restart;

2.3 去nagios服務端check一下

[[email protected] ~]#  /usr/local/nagios/libexec/check_nrpe -H 1x.xx4.x.x5 -c check_lvs lvs critical,lvs is down now.[[email protected] ~]#

看到check出來lvs服務已經處於down模式。

說明：由於check_lvs是要調用ipvsadm命令來擷取LVS狀態的，而ipvsadm命令是只能以root使用者來啟動並執行, 所以需要將nagios使用者佈建成可以無需密碼直接su成root，這樣就能以nagios使用者運行命令sudo /usr/lib/nagios/plugins/check_lvs 。在centos系統中，無法直接調用sudo命令，需要修改/etc/sudoers, 找到 #Defaults requiretty 並取消注釋，另外新增一行。表示nagios使用者不需要登陸終端就可以調用命令，如下所示：

Defaults    requirettyDefaults:nagios    !requiretty#添加nagios 請求sudo，允許特定指令時（可跟參數），不要求輸入密碼（如）。nagios ALL=(ALL) NOPASSWD: ALL

 再去naigos伺服器上面check下，已經生效，如下所示：

[[email protected] etc]# /usr/local/nagios/libexec/check_nrpe -H 10.xx.xx.xx -c check_lvsLVS OK - LVS is running (conn: 16 active, 77 inactive)|active=16;69999;99999;0; inactive=77;69999;99999;0;[[email protected] etc]#

 

2.4 在nagios伺服器上添加配置

vim services.cfgdefine service{        host_name               lvs-lan        service_description     Check lvs        check_command           check_nrpe!check_lvs        max_check_attempts      5        normal_check_interval   3        retry_check_interval    2        check_period            24x7        notification_interval   10        notification_period     24x7        notification_options    w,c,r        contact_groups          opsweb        }vim objects/commands.cfgdefine command{        command_name    check_lvs        command_line    $USER1$/check_lvs -H $HOSTADDRESS$ -w $ARG1$ -c $ARG2$        }

之後重新載入nagios既完成了對lvs的監控服務。

[[email protected] etc]# service nagios reloadRunning configuration check...Reloading nagios configuration...done[[email protected] etc]#

 至此，nagios下面對lvs服務的監控已經完成。

 

參考資料：http://c20031776.blog.163.com/blog/static/684716252013627506890/