SNMP community in host configuration (add a generic userarg command ?)

[Andreas Ericsson]

Michael Medin wrote:
> Hi,
> 
> How about adding some form of prefix to settings like:
> 
> define host{ ... userargs MYOWNKEY "This is a value" ... }
> 

I believe something along those lines is scheduled for later inclusion
by Ethan. I don't know when though, but I suppose it'll be on a rainy day.

> That gets translated into: $MYOWNKEY$ when a command is executed? 
> That would allow people that have a need for user settings to use
> them and still not fill up the namespace. I know this might be useful
> for me as I have certain keys that are used changing based on "host
> groups" (read templates). For instance snmp community strings (and
> for that matter authorization tokens). Then I could derive all hosts
> using a certain snmp community from the same template? Also along
> this line something I have been wanting is "multiple inheritance"
> (don't laugh :).

I believe the docs say that objects can use several templates (I know 
templates can use other templates, so it can be done anyway). Poke 
around and try a little.

> This would allow me to cross inherit settings from
> various classes. To make an example of what I mean: A server have
> different aspects: 1, contact settings (all our notes servers are
> "owned" by the same support group). 2, check frequency
> (test/verification systems need to be check less then ones that are
> serving users).
> 
> This is two aspects that could be inherited but are distinct (as in
> not the same) as we have notes-servers that are test and ones that
> are serving users. We also have the same aspects on other server
> groups.
> 
> Now this might be possible already (haven't tired, I just assumed
> that it couldn't be done)
> 
> If it sounds like a reasonable thing to do I could look into
> implementing it for nagios 2.0 but if it just me being deluded I can
> also manage this in my config files :)
> 
> // Michael Medin
> 
> -----Original Message----- From:
> nagios-devel-admin at lists.sourceforge.net
> [mailto:nagios-devel-admin at lists.sourceforge.net] On Behalf Of
> Andreas Ericsson Sent: den 11 januari 2005 16:33 To: Patrick Proy Cc:
> 'nagios-devel' Subject: Re: [Nagios-devel] RE: SNMP community in host
> configuration
> 
> Patrick Proy wrote:
> 
>> Hi,
>> 
>> Did anybody test the patch ?
>> 
> 
> 
> Like I told you before you went along hacking up this patch, it 
> addresses a very limited usergroup. I believe most networks have at
> the most two or three snmp communities/username-password-pairs.
> 
> 
>> Patrick
>> 
>> 
>> 
>>> Envoyé : mardi 21 décembre 2004 16:04 À : 'nagios-devel' Objet :
>>> [Nagios-devel] RE: SNMP community in host configuration
>>> 
>>> Hi,
>>> 
>>> I updated my patch. Works with today's CVS : "patch -p0 < 
>>> patch_nag_snmp_2004.12.21.patch" :
>>> 
>>> - added "snmp_community" in host/template definition, accessed by
>>> $SNMPCOMMUNITY$ macro.
>>> 
>>> - Changed the "hostuser" macro in "hostmacro" : - in
>>> host/template definition : "hostmacro<n>   SomeData" - In
>>> services : "$HOSTMACRO<n>$"
>>> 
>>> - In nagios.cfg, the option is now named "host_snmp_login", same
>>> syntax.
>>> 
>>> As usual, feedbacks are welcome !
>>> 
>>> Patrick nagios AT proy.org
>>> 
>>> 
>>> 
>>>> How to patch : - it work with the CVS version of 19 Dec 2004 -
>>>> in the "nagios-cvs" directory : "patch -p0 <
>>> 
>>> patch_nag_snmp.patch"
>>> 
>>> 
>>>> Note : only works with template based config files.
>>>> 
>>>> I tested it on Linux only for now, but as nothing is platform 
>>>> specific, it should be OK. Here are the modified files (if a
>>>> new CVS version is out) : - common/objects.c base/config.c
>>>> base/nagios.c base/utils.c include/common.h include/objects.h
>>>> include/nagios.h.in xdata/xodtemplate.c xdata/xodtemplate.h
>>>> 
>>>> 
>>>> What it does :
>>>> 
>>>> 1) SNMP for each host
>>>> 
>>>> You can put snmp information in three ways : - In the host
>>>> definition : snmp_version <int>    # stores snmp version 
>>>> snmp_login <string>   # stores snmp login (for v3) snmp_pass
>>>> <string>   # stores snmp password for v3 or community for v1 
>>>> None of them are compulsory of course - In the host template
>>>> (will then only overwrite what's not in host definition) Same
>>>> syntax
>>>> 
>>>> - In the nagios.cfg file : 
>>>> snmp_login=1,<comunity>,<network>/<mask> 
>>>> snmp_login=3,<login>,<pass>,<network>/<mask>  This is generic
>>>> snmp login for networks : it will be
>>> 
>>> put in the host
>>> 
>>> 
>>> 
>>>> snmp info if the host hasn't got any, and if it's address
>>> 
>>> matches the
>>> 
>>> 
>>>> network/mask definition. Mask with best precision will be
>>>> chosen first. Example : snmp_login=1,private,10.100.0.0/16 
>>>> snmp_login=3,login1,pass1,10.100.0.3/32
>>>> 
>>>> This means : - on the 10.100.0.0/16 network : v1, private - for
>>>> the 10.100.0.3 host : v3 : login1, pass1  10.100.3.45 : will
>>>> get v1, private 10.100.0.3 : will get v3, login1, pass1
>>>> 
>>>> - The information is available as macro : - $SNMPVERSION$ -
>>>> $SNMPLOGIN$ - $SNMPPASS$ 
>>>> 
>>>> 2) user variables for host  - Each host can have up to 10 user
>>>> variables (you can put more or less, just by modifying a number
>>>> in the code), specified in its definition : hostuser<n>
>>>> <string>  example : hostuser3	SomeInformation
>>>> 
>>>> - Of course, host templates can have hostuser<n> too. (will
>>> 
>>> be put in
>>> 
>>> 
>>>> host definition is the host doesn't have the hostuser<n>
>>>> already).
>>>> 
>>>> - Available as macro : $HOSTUSER<n>$
>>>> 
>>>> TODO : - I forgot snmp v2c : maybe 2 will be okay but it would
>>>> be
>>> 
>>> cleaner to
>>> 
>>> 
>>>> have "2c". - Hostuser are from 0->9..., maybe it would be
>>>> cleaner to put 1->10.
>>>> 
>>>> 
>>>> Please test it and give me feedback !
>>>> 
>>>> 
>>>> Patrick nagios AT proy.org
>>>> 
>>> 
>> 
>> 
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> 
> 

-- 
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Lead Developer


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