Nagios-users digest, Service NOT running check

[Stanley Hopcroft]

Dear Sir,

I am writing to thank you for your letter and say,

  .. several mega-lines of multi-part (from the digest) deleted ..

> 
> Message: 16
> Date: Fri, 06 Aug 2004 11:03:24 +0900
> From: Ian Masters <ian at acces.co.jp>
> To: <nagios-users at lists.sourceforge.net>
> Subject: [Nagios-users] Service NOT running check
> 
> I'm sure that I've missed a basic premise about Nagios but I still can't for
> the life of me work out how to check that a service e.g. Telnet, is not
> running. 
> 
> Obviously I can check the port and get an alert and then acknowledge it. The
> Network Health then returns to all green. Is that the way it's normally
> done?

Do you mean that Nag is misreporting the state of a service ?

If, however, you mean that a port reachability check a la check_tcp is 
insufficient to determine the health of the server listening on that 
port, then agreed.

> 
> When I was using Big Brother, you could check that a service is NOT running.
> Is this not done in Nagios?
> 

IIRC check_procs either run with ssh or by NRPE will let you know if a 
Unix process is not in the process table and therefore not running.

You can also check the server by exercising it more extensively eg in 
order of severity

1 check_ftp and friends eg 

tsitc> /usr/local/nagios/libexec/check_ftp -H mvs -v
FTP ok - 1 sec. response time, 220-FTPSERVE IBM FTP CS V2R6 at IPAP, 
22:03:05 on 2004-08-06.

tsitc> /usr/local/nagios/libexec/check_smtp -H mvs -v
SMTP OK - 0 sec. response time, 220 MVS_SNAL.AIPO.GOV.AU running IBM MVS 
SMTP CS V2R6 on Fri, 06 Aug 04 22:06:05 LCL
tsitc> 

2 write your own plugins that exercise the server with tools such as

. wget, lynx, expect (or curl, Perl modules such as LWP, Perl 
Net::Telnet, Net::FTP, Expect)

. use the CPAN WWW::Mechanize way to automate web page access

etc etc

Having read this, I see Karl has probably answered your question. Sorry 
for the waste of time.

> Thanks 
> 
> Ian Masters
>

Yours sincerely.

-- 
------------------------------------------------------------------------
Stanley Hopcroft
------------------------------------------------------------------------

'...No man is an island, entire of itself; every man is a piece of the
continent, a part of the main. If a clod be washed away by the sea,
Europe is the less, as well as if a promontory were, as well as if a
manor of thy friend's or of thine own were. Any man's death diminishes
me, because I am involved in mankind; and therefore never send to know
for whom the bell tolls; it tolls for thee...'

from Meditation 17, J Donne.


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