一、簡介
1、獲取更多的NSClient原理,請參考NSClient++官方站點
NSClient++官網:http://www.nsclient.org/
2、NSClient++與NRPE
NSClient++的工作原理
NRPE的工作原理
Nagios對Windows主機的監控主要有三種方法
第一種是NSclient++
第二種是NRPE
第三種是SNMP(不是很常用)
NSclient++與nrpe最大的區別就是:
1、被監控機上安裝有nrpe,並且還有插件,最終的監控是由這些插件來進行的.當監控主機將監控請求發給nrpe后,nrpe調用插件來完成監控.
2、NSclient++則不同,被監控機上只安裝NSclient++,沒有任何的插件.當監控主機將監控請求發給NSclient++后,NSclient++直接完成監控,所有的監控是由NSclient++完成的。
這也說明了NSclient++的一個很大的問題,不靈活,沒有可擴展性.它只能完成自己本身包含的監控操作,不能由一些插件來擴展.好在NSclient++已經做的不錯了,基本上可以完全滿足我們的監控需要。
二、check_nt的方式監控windows主機
1、下載NSClient++
下載地址:http://sourceforge.net/projects/nscplus/files/nscplus/
2、安裝NSClient++
Allowed hosts:(this is the IP of the nagios (or other)server)
允許的主機地址:Nagios服務器端的IP地址
NSClient password(only userd via check_nt)
NSClient的密碼:填寫Nagios跟NSClient++進程通信的密碼,可以不設置
Modules to load:
安裝並加載相應的模塊:NSClient++自帶的有check_plugins插件,check_nt,check_nrpe,NSCA,WMI
在這里我們全部選擇,以后會有用到的。
點擊【Finsh】,表示安裝NSClient++完成
3、查看NSClient++服務是否已經啟用
4、查看NSClient++的配置文件
默認是安裝在C:\Program Files\NSClient++ 目錄下,NSC.ini即為NSClient服務的配置文件,一般我們無需修改,但是當我們監控端的IP地址改變時,或者密碼忘記,即可以在這里修改了。
安裝時加載的模塊
設置允許連接的地址:為Nagios的IP地址
NRPE的默認端口號
三、NSClient應用監控
NSClient++與Nagios服務器通信,主要使用Nagios服務器的check_nt插件。原理圖如下
1、check_nt插件的使用說明
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[root@Nagios ~]
# cd /usr/local/nagios/libexec/
[root@Nagios libexec]
# ./check_nt -h #查看check_nt的語法
check_nt v2.0.3 (nagios-plugins 2.0.3)
Copyright (c) 2000 Yves Rubin (rubiyz@yahoo.com)
Copyright (c) 2000-2014 Nagios Plugin Development Team
<devel@nagios-plugins.org>
This plugin collects data from the NSClient service running on a
Windows NT
/2000/XP/2003
server.
Usage:
check_nt -H host -
v
variable [-p port] [-w warning] [-c critical]
[-l params] [-d SHOWALL] [-u] [-t timeout]
Options:
-h, --help
Print detailed help
screen
-V, --version
Print version information
--extra-opts=[section][@
file
]
Read options from an ini
file
. See
https:
//www
.nagios-plugins.org
/doc/extra-opts
.html
for
usage and examples.
Options:
-H, --
hostname
=HOST
Name of the host to check
-p, --port=INTEGER
Optional port number (default: 1248)
#默認端口號
-s, --secret=<password>
#指定的密碼
Password needed
for
the request
-w, --warning=INTEGER
Threshold
which
will result
in
a warning status
-c, --critical=INTEGER
Threshold
which
will result
in
a critical status
-t, --timeout=INTEGER
Seconds before connection attempt
times
out (default: -l, --params=<parameters>
Parameters passed to specified check (see below) -d, --display={SHOWALL}
Display options (currently only SHOWALL works) -u, --unknown-timeout
Return UNKNOWN on timeouts10)
-h, --help
Print this help
screen
-V, --version
Print version information
-
v
, --variable=STRING
Variable to check
Valid variables are:
CLIENTVERSION = Get the NSClient version
If -l <version> is specified, will
return
warning
if
versions differ.
CPULOAD =
Average CPU load on last x minutes.
Request a -l parameter with the following syntax:
-l <minutes range>,<warning threshold>,<critical threshold>.
<minute range> should be
less
than 24*60.
Thresholds are percentage and up to 10 requests can be
done
in
one shot.
ie: -l 60,90,95,120,90,95
UPTIME =
Get the uptime of the machine.
-l <unit>
<unit> = seconds, minutes, hours, or days. (default: minutes)
Thresholds will use the unit specified above.
USEDDISKSPACE =
Size and percentage of disk use.
Request a -l parameter containing the drive letter only.
Warning and critical thresholds can be specified with -w and -c.
MEMUSE =
Memory use.
Warning and critical thresholds can be specified with -w and -c.
SERVICESTATE =
Check the state of one or several services.
Request a -l parameters with the following syntax:
-l <service1>,<service2>,<service3>,...
You can specify -d SHOWALL
in
case
you want to see working services
in
the returned string.
PROCSTATE =
Check
if
one or several process are running.
Same syntax as SERVICESTATE.
COUNTER =
Check any performance counter of Windows NT
/2000
.
Request a -l parameters with the following syntax:
-l
"\\<performance object>\\counter"
,"<description>
The <description> parameter is optional and is given to a
printf
output
command
which
requires a float parameter.
If <description> does not include
"%%"
, it is used as a label.
Some examples:
"Paging file usage is %%.2f %%%%"
"%%.f %%%% paging file used."
INSTANCES =
Check any performance counter object of Windows NT
/2000
.
Syntax: check_nt -H <
hostname
> -p <port> -
v
INSTANCES -l <counter object>
<counter object> is a Windows Perfmon Counter object (eg. Process),
if
it is two words, it should be enclosed
in
quotes
The returned results will be a comma-separated list of instances on
the selected computer
for
that object.
The purpose of this is to be run from
command
line to determine what instances
are available
for
monitoring without having to log onto the Windows server
to run Perfmon directly.
It can also be used
in
scripts that automatically create Nagios service
configuration files.
Some examples:
check_nt -H 192.168.1.1 -p 1248 -
v
INSTANCES -l Process
#check_nt的語法
Notes:
- The NSClient service should be running on the server to get any information
(http:
//nsclient
.ready2run.
nl
).
- Critical thresholds should be lower than warning thresholds
- Default port 1248 is sometimes
in
use by other services. The error
output when this happens contains
"Cannot map xxxxx to protocol number"
.
One fix
for
this is to change the port to something
else
on check_nt
and on the client service it's connecting to.
Send email to help@nagios-plugins.org
if
you have questions regarding use
of this software. To submit patches or suggest improvements, send email to
devel@nagios-plugins.org
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2、check_nt命令的使用
check_nt參數解釋
-w:警告比例
-c:緊急比例
四、定義命令、主機、服務
1、定義命令
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[root@Nagios ~]
# vim /usr/local/nagios/etc/objects/commands.cfg
# 'check_win' command definition
define
command
{
command_name check_win
command_line $USER1$
/check_nt
-H $HOSTADDRESS$ -p 12489 -
v
$ARG1$ $ARG2$
}
注釋:
$..$ 表示系統內置的宏,也就是所謂的變量
$USER1$ 表示插件所在的目錄
-H 指定主機地址
$HOSTADDRESS$ 應用到哪個主機,就用哪個主機的地址
$ARG1$ 傳遞的參數,形參
-s 指定密碼 默認為空
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2、定義主機和服務
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[root@Nagios objects]
# cp windows.cfg windows106.cfg
[root@Nagios objects]
# sed -i 's/winserver/Windows106/g' windows106.cfg
[root@Nagios objects]
# sed -i 's/192.168.1.2/192.168.0.106/' windows106.cfg
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4、檢測配置文件是否有語法錯誤
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[root@Nagios ~]
# service nagios configtest
Nagios Core 4.0.7
Copyright (c) 2009-present Nagios Core Development Team and Community Contributors
Copyright (c) 1999-2009 Ethan Galstad
Last Modified: 06-03-2014
License: GPL
Website: http:
//www
.nagios.org
Reading configuration data...
Read main config
file
okay...
Read object config files okay...
Running pre-flight check on configuration data...
Checking objects...
Checked 8 services.
Checked 1 hosts.
Checked 1 host
groups
.
Checked 0 service
groups
.
Checked 1 contacts.
Checked 1 contact
groups
.
Checked 25 commands.
Checked 5
time
periods.
Checked 0 host escalations.
Checked 0 service escalations.
Checking
for
circular paths...
Checked 1 hosts
Checked 0 service dependencies
Checked 0 host dependencies
Checked 5 timeperiods
Checking global event handlers...
Checking obsessive compulsive processor commands...
Checking misc settings...
Total Warnings: 0
Total Errors: 0
Things
look
okay - No serious problems were detected during the pre-flight check
Object precache
file
created:
/usr/local/nagios/var/objects
.precache
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5、重啟nagios服務
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[root@Nagios objects]
# service nagios restart
Running configuration check...
Stopping nagios: .
done
.
Starting nagios:
done
.
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四、瀏覽器查看監控信息
1、登陸后點擊【Hosts】,查看新監控的Windows主機信息
2、點擊【Services】,查看Windows服務的狀態信息
3、等待幾分鍾后狀態就正常了,如下圖所示
三、NRPE的方式監控windows主機
1、修改NSClient++的配置文件
2、重新啟動NSClient++服務
3、Nagios服務端測試NRPE命令
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[root@Nagios ~]
# cd /usr/local/nagios/libexec/
[root@Nagios libexec]
# ./check_nrpe -h
NRPE Plugin
for
Nagios
Copyright (c) 1999-2008 Ethan Galstad (nagios@nagios.org)
Version: 2.15
Last Modified: 09-06-2013
License: GPL v2 with exemptions (-l
for
more
info)
SSL
/TLS
Available: Anonymous DH Mode, OpenSSL 0.9.6 or higher required
Usage: check_nrpe -H <host> [ -b <bindaddr> ] [-4] [-6] [-n] [-u] [-p <port>] [-t <timeout>] [-c <
command
>] [-a <arglist...>]
Options:
-n = Do no use SSL
-u = Make socket timeouts
return
an UNKNOWN state instead of CRITICAL
<host> = The address of the host running the NRPE daemon
<bindaddr> = bind to
local
address
-4 = user ipv4 only
-6 = user ipv6 only
[port] = The port on
which
the daemon is running (default=5666)
[timeout] = Number of seconds before connection
times
out (default=10)
[
command
] = The name of the
command
that the remote daemon should run
[arglist] = Optional arguments that should be passed to the
command
. Multiple
arguments should be separated by a space. If provided, this must be
the last option supplied on the
command
line.
Note:
This plugin requires that you have the NRPE daemon running on the remote host.
You must also have configured the daemon to associate a specific plugin
command
with the [
command
] option you are specifying here. Upon receipt of the
[
command
] argument, the NRPE daemon will run the appropriate plugin
command
and
send the plugin output and
return
code back to *this* plugin. This allows you
to execute plugins on remote hosts and
'fake'
the results to
make
Nagios think
the plugin is being run locally.
check_nrpe語法:
check_nrpe ... -c <
command
> [-a <argument> <argument> <argument>]
check_nrpe的內置命令:
· CheckAlwaysCRITICAL (check)
· CheckAlwaysOK (check)
· CheckAlwaysWARNING (check)
· CheckCPU (check)
· CheckCRITICAL (check)
· CheckCounter (check)
· CheckEventLog
/CheckEventLog
(check)
· CheckFile (check)
· CheckFileSize (check)
· CheckMem (check)
· CheckMultiple (check)
· CheckOK (check)
· CheckProcState (check)
· CheckServiceState (check)
· CheckTaskSched
/CheckTaskSched
(check)
· CheckUpTime (check)
· CheckVersion (check)
· CheckWARNING (check)
· CheckWMI
/CheckWMI
(check)
· CheckWMIValue (check)
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[root@Nagios libexec]
# ./check_nrpe -H 192.168.1.142 -p 5666 -c CheckCPU -a warn=80 crit=90 time=20m time=10s time=4
OK CPU Load ok.|
'20m'
=0%;80;90
'10s'
=0%;80;90
'4'
=0%;80;90
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