2011年10月5日星期三

nagios linux nrpe設定(3)使用nagios-plugins

參考
http://nagios.sourceforge.net/docs/nrpe/NRPE.pdf
http://www.debianhelp.co.uk/nagiospluins.htm

比較：
nagios server端：192.168.1.2 ，已在web server根目錄放 index.html 的 nagios server端
client 端：192.168.1.133，web server根目錄沒東西，check_http 正常會回應 403 Forbidden

兩者在 nrpe.cfg 都沒定義 check_http ，但 command-plugins.cfg 有command[check_http]

nagios linux nrpe設定(2)-基本安裝

*被監視端：
從剛裝好完全沒東西的 VM開始…

CentOS5.5 用 rpmforge 的來源做 yum 安裝，plugins 是放在
/usr/lib64/nagios/plugins/

yum install nrpe
會安裝
fping
nagios-plugins
perl-Crypt-DES
perl-Net-SNMP

2011年10月4日星期二

nagios linux nrpe設定

server 裝好的 localhost

CentOS5.5 用 rpmforge 的來源做 yum 安裝，plugins 是放在
/usr/lib64/nagios/plugins/

...首先
/etc/nagios/nrpe.cfg 裡的
server_address=
allow_hosts=
後面跟的 IP 不能用逗點加別的 ip (例如：192.168.2.3,127.0.0.1)
目前先試只定義 server_address 1個 IP
allow_hosts 註解掉

iptables 加上 -p tcp -m tcp --dport 5666 -j ACCEPT

nagios linux nrpe設定(5) 另外加 plugins & command(2)

想新增一項目來看Linux client端的記憶體使用情形（Windows的預設有此項目）
預設沒有此command可處理…
記錄改了多少東東…

實作完…問題在佈署

Client 端(安裝 nagios-nrpe ，nagios-nrpe-plugins)
*在 /usr/lib64/nagios/plugins/ 新增command用的shell script，
記得chmod 755（權限要跟其它plugin一樣）

實作時用的是下列討論區用的 script：
http://serverfault.com/questions/195815/nagios-memory-configuration
另有一版本可參考
http://www.linuxquestions.org/questions/linux-software-2/nagios-check-ram-usage-on-remote-server-747531/

vi /usr/lib64/nagios/plugins/check_memeory.sh


#!/bin/bash
#
# Script to check memory usage on Linux. Ignores memory used by disk cache. 
#
# Requires the bc command
#
print_help() {
    echo "Usage:"
    echo "[-w] Warning level as a percentage" 
    echo "[-c] Critical level as a percentage" 
    exit 0
}

while test -n "$1"; do
    case "$1" in
        --help|-h)
            print_help
            exit 0
            ;;
        -w)
            warn_level=$2
            shift
            ;;
        -c)
            critical_level=$2
            shift
            ;;
        *)
            echo "Unknown Argument: $1"
            print_help
            exit 3
            ;;
    esac
    shift
done

if [ "$warn_level" == "" ]; then
    echo "No Warning Level Specified"
    print_help
    exit 3;
fi

if [ "$critical_level" == "" ]; then
    echo "No Critical Level Specified"
    print_help
    exit 3;
fi


free=`free -m | grep "buffers/cache" | awk '{print $4}'`
used=` free -m | grep "buffers/cache" | awk '{print $3}'`

total=$(($free+$used))

result=$(echo "$used / $total * 100" |bc -l|cut -c -2)

if [ "$result" -lt "$warn_level" ]; then
    echo "Memory OK. $result% used."
    exit 0;
elif [ "$result" -ge "$warn_level" ] && [ "$result" -le "$critical_level" ]; then
    echo "Memory WARNING. $result% used."
    exit 1;
elif [ "$result" -gt "$critical_level" ]; then
    echo "Memory CRITICAL. $result% used."
    exit 2;
fi

chmod 755 /usr/lib64/nagios/plugins/check_memeory.sh
Client本機端試用：
sh /usr/lib64/nagios/plugins/check_memory.sh
sh /usr/lib64/nagios/plugins/check_memory.sh -w 80 -c 95

*在 /etc/nagios/nrpe.cfg 新增 command

##self defined## MEMORY Check
# check_mem   = MEMORY at defined warning and critical use %.
command[check_memory]=/usr/local/nagios/libexec/check_memory.sh -w $ARG1$ -c $ARG2$

service nrpe restart

Nagios Server端
*在 /etc/nagios/objects/commands.cfg 新定義 command


define command{
command_name check_memory
command_line $USER1$/check_memory.sh -w $ARG1$ -c $ARG2$
}

*在對象設定檔.cfg 新增 service
測試對象：localhost.cfg
vi /etc/nagios/objects/localhost.cfg

define service{
        use                   local-service;Name of service template to use
        host_name             localhost
        service_description   Memory Use
        check_command         check_memory!80!90
        }

service nagios restart

nagios linux nrpe設定(5) 另外加 plugins & command(1)

起因：看到 check_nt 可以看 Windows Client 的 memory usage ...Linux預設沒有...
由於預設沒有此command可處理，所以開始…

小記：實作記錄見下篇
*在 /usr/lib64/nagios/plugins/ 新增command用的shell script，
記得chmod 755（權限要跟其它plugin一樣）
*在 /etc/nagios/objects/commands.cfg 新增 command
*在 /etc/nagios/nrpe.cfg 新增 command
*在 /etc/nagios/objects/對象設定檔.cfg 新增 service

先貼大致用上的 link
做一個 .sh 檔來 check memory

========================================================================

其它版本
http://www.linuxquestions.org/questions/linux-software-2/nagios-check-ram-usage-on-remote-server-747531/
http://www.linuxquestions.org/questions/linux-software-2/check_log-nrpe-error-connection-refused-by-host-889073/

ESXi3 http://www.net130.com/CMS/Pub/network/network_manage/2011_07_13_66939.htm

http://serverfault.com/questions/195815/nagios-memory-configuration

Service definition on the server in the host config:

define service {
       use                     generic-service
       host_name               
       service_description     Memory Usage
       check_command           check_nrpe_1arg!check_memory
}

This needs to be defined in /etc/nagios/nrpe.cfg on the client, amended for the values you want to check for:

command[check_memory]=/usr/lib/nagios/plugins/check_memory.sh -w 85 -c 90

Example output:

#:~$ ./check_memory.sh -w 80 -c 90
Memory OK. 44% used.


#:~$ ./check_memory.sh -w 40 -c 50
Memory WARNING. 44% used.

The script:

#!/bin/bash
#
# Script to check memory usage on Linux. Ignores memory used by disk cache. 
#
# Requires the bc command
#
print_help() {
    echo "Usage:"
    echo "[-w] Warning level as a percentage" 
    echo "[-c] Critical level as a percentage" 
    exit 0
}

while test -n "$1"; do
    case "$1" in
        --help|-h)
            print_help
            exit 0
            ;;
        -w)
            warn_level=$2
            shift
            ;;
        -c)
            critical_level=$2
            shift
            ;;
        *)
            echo "Unknown Argument: $1"
            print_help
            exit 3
            ;;
    esac
    shift
done

if [ "$warn_level" == "" ]; then
    echo "No Warning Level Specified"
    print_help
    exit 3;
fi

if [ "$critical_level" == "" ]; then
    echo "No Critical Level Specified"
    print_help
    exit 3;
fi


free=`free -m | grep "buffers/cache" | awk '{print $4}'`
used=` free -m | grep "buffers/cache" | awk '{print $3}'`

total=$(($free+$used))

result=$(echo "$used / $total * 100" |bc -l|cut -c -2)

if [ "$result" -lt "$warn_level" ]; then
    echo "Memory OK. $result% used."
    exit 0;
elif [ "$result" -ge "$warn_level" ] && [ "$result" -le "$critical_level" ]; then
    echo "Memory WARNING. $result% used."
    exit 1;
elif [ "$result" -gt "$critical_level" ]; then
    echo "Memory CRITICAL. $result% used."
    exit 2;
fi

2011年10月3日星期一

nagios 小記 - Windows Client 安裝 NSClient++

＊ Windows Client 要安裝的 NSClient++
新版的 client 會自動加規則到內建的防火牆
但這次遇到 nagios server端的 objects/commands.cfg，
預設 $HOSTADDRESS& -p 這段後面不是 IP，會有"server port is not interger" 之類的訊息
就算 NSClient 的設定檔不刻意設定 port ，也要在 commands.cfg 裡指定“ -p 12489”

NSClient++ 安裝時（或事後更改設定檔）設定的密碼
為明碼，在 nagios server端的 objects/commands.cfg
找到(預設應該完全沒有?)
command_line $USER1$/check_nt -H $HOSTADDRESS$ -p portnumber
後面加上“ -s 密碼” 搭配使用

參考：

NSClient++ Port Forwarding and Firewall

The default port for NSClient++ is 12489

You must allow the firewall at your remote server to allow this port access.

Changing NSClient++ port:

You can change the NSClient++ port by modifying the NSC.ini file located at C:\Program Files\NSClient++ (remove “;”)

;# NSCLIENT PORT NUMBER
;  This is the port the NSClientListener.dll will listen to.
port=12489

Restart the NSClient++ service

Change check_nt -p 12489 argument in /usr/local/nagios/etc/objects/commands.cfg

# 'check_nt' command definition
define command{
        command_name    check_nt
        command_line    $USER1$/check_nt -H $HOSTADDRESS$ -p portnumber -s cjr-nagios -v $ARG1$ $ARG2$
        }

參考來源：
http://nagios.sourceforge.net/docs/3_0/monitoring-windows.html
http://www.kernelhardware.org/nagios-nsclient-to-monitor-remote-windows-server/
http://www.thegeekstuff.com/2008/07/how-to-monitor-remote-windows-machine-using-nagios-on-linux/
http://creative1223.pixnet.net/blog/post/1302004

＊檢查 D磁碟機，注意後面的參數是 -l d (小寫L)

check_command check_nt!USEDDISKSPACE!-l d -w 80 -c 90

http://nagiosplugins.org/man/check_disk
http://nagiosplugins.org/man/check_nt

待試：
http://nagiosplugins.org/man/check_nt
http://nagioswiki.com/wiki/index.php/Checking_NT_Services_with_Nagios

[轉貼]CentOS install Nagios

*這次實作卡在... 漏裝 gcc glibc glibc-common gd gd-devel 也沒啥差!?
…要先啟動 nagios service 再啟動 httpd ??

手工安裝（含服務、權限）...愈下文愈新
http://blog.haohtml.com/archives/4565
http://blog.prosight.me/index.php/2009/06/10
http://www.ibm.com/developerworks/cn/linux/l-ganglia-nagios-2/

http://forum.icst.org.tw/phpbb/viewtopic.php?t=17761

http://www.xtgly.com/2010/09/21/centos-5-5-nginx-nagios%E7%9B%91%E6%8E%A7%E7%AB%AF%E5%92%8C%E8%A2%AB%E6%8E%A7%E7%AB%AF%E5%AE%89%E8%A3%85%E9%85%8D%E7%BD%AE%E6%8C%87%E5%8D%97.htm

http://www.openfoundry.org/tw/tech-column/8308--nagios-
http://creative1223.pixnet.net/blog/category/61902

步驟詳盡…在unix下...
http://homepage.mac.com/duling/halfdozen/Nagios-Howto-p1.html
http://homepage.mac.com/duling/halfdozen/Nagios-Howto-p2.html

yum 安裝：需先下載安裝 rpmforge
http://wiki.centos.org/zh-tw/AdditionalResources/Repositories/RPMForge
http://wiki.centos.org/zh-tw/HowTos/Nagios
http://docs.cslabs.clarkson.edu/wiki/Install_Nagios_on_CentOS_5

Install

Add RPMForge Yum Repository

It is recommended that you configure yum-priorities prior to following this tutorial to avoid having base CentOS packages being overwritten by the RPMForge repository. Instructions to do so can be found on the CentOS Wiki.

For x86 (32-bit) systems
- rpm -Uhv http://apt.sw.be/redhat/el5/en/i386/rpmforge/RPMS/rpmforge-release-0.3.6-1.el5.rf.i386.rpm
  - From Dag Wieers

For x64 (64-bit) systems
- rpm -Uhv http://apt.sw.be/redhat/el5/en/x86_64/rpmforge/RPMS//rpmforge-release-0.3.6-1.el5.rf.x86_64.rpm
  - From Dag Wieers

Install & Configure Prerequisites

Install Apache
- yum install httpd php gcc glibc glibc-common gd gd-devel

Configure Apache to start on boot
- /sbin/chkconfig --levels 345 httpd on

Configure iptables to allow Apache traffic
- /sbin/iptables -I INPUT -p tcp --dport 80 -j ACCEPT
- /etc/init.d/iptables save
- /etc/init.d/iptables restart

Install & Configure Nagios

Install Nagios & Plugins
- yum install nagios nagios-plugins nagios-plugins-setuid

Create the default Nagios web access user & set a password
- htpasswd -c /etc/nagios/htpasswd.users nagiosadmin

Verify default config files
- nagios -v /etc/nagios/nagios.cfg

Start Nagios
- /etc/init.d/nagios start

Start Apache
- /etc/init.d/httpd start

Verify Install

Try logging into your new Nagios installation by going to http://servername/nagios/ and logging in with nagiosadmin and the password you set.

訂閱：文章 (Atom)

Linux筆記

2011年10月5日星期三

nagios linux nrpe設定(3)使用nagios-plugins

nagios linux nrpe設定(2)-基本安裝

2011年10月4日星期二

nagios linux nrpe設定

nagios linux nrpe設定(5) 另外加 plugins & command(2)

nagios linux nrpe設定(5) 另外加 plugins & command(1)

2011年10月3日星期一

nagios 小記 - Windows Client 安裝 NSClient++

NSClient++ Port Forwarding and Firewall

[轉貼]CentOS install Nagios

Install

Add RPMForge Yum Repository

Install & Configure Prerequisites

Install & Configure Nagios

Verify Install

BloggerAds

2011年10月5日 星期三

2011年10月4日 星期二

2011年10月3日 星期一

NSClient++ Port Forwarding and Firewall

Install

Add RPMForge Yum Repository

Install & Configure Prerequisites

Install & Configure Nagios

Verify Install

BloggerAds

2011年10月5日星期三

2011年10月4日星期二

2011年10月3日星期一