Re: Updating snmpd.conf

Our net-snmp version is 5.4

There is no usage of HUP signal and higher level agent framework invokes
net-snmp API, snmpd.c::netsnmp_reconfig(), after updating or creating new
snmpd.conf.  After this method call then snmpd is reloading snmpd.conf file
and configuring the entries. I suspect this method is not correct as per
the observed behavior.

Suppose an entry exists in snmpd.conf --  trapsess [std args] host1  and
lets say its configuration as (data set -v1)

Now trying to add a new host entry (host2) to the system then snmpd.conf
will have all its current entries and additionally

snmpd.conf will have (data set -v1) +  trapsess [std args] host2

System will invoke snmpd.c::netsnmp_reconfig(). From this point the snmpd
will send 2 (counter) traps for host1 for any event directed for host1 and
this counter depends on how many times snmpd.conf is updated / added new
entries.

>From net-snmp wiki, http://www.net-snmp.org/docs/man/snmpd.conf.html,

The Net-SNMP agent can be instructed to re-read the various configuration
files, either via an *snmpset* assignment of integer
<http://www.net-snmp.org/docs/man/integer.html>(1) to
UCD-SNMP-MIB::versionUpdateConfig.0 (.1.3.6.1.4.1.2021.100.11.0), or by
sending a *kill -HUP* signal to the agent process.

I don't think we are doing either of this model and using only
snmpd.c::netsnmp_reconfig()

What model do you follow for updating? As per our design model, we can't
send HUP signal and restart a process.

Maanas





On Thu, Aug 14, 2014 at 7:39 AM, Bill Fenner <[email protected]> wrote:

> I would look into what snmpd does when it receives a HUP signal.
>
> You didn't mention what version of net-snmp you are using.  It's possible
> that there were some bugs that caused the behavior that you're observing.
>  Can you see if this behavior still happens with 5.7.2.pre5?
>
>   Bill
>
>
> On Wed, Aug 13, 2014 at 6:26 PM, maanas <[email protected]> wrote:
>
>> I really appreciate if someone could provide some input on their
>> development model for configuring or updating snmpd.conf from the agent
>> framework. Thank you.
>>
>>
>>
>>
>> On Sat, Aug 9, 2014 at 12:25 PM, maanas <[email protected]> wrote:
>>
>>> Can you please advice what is the recommended method for configuring
>>> snmpd.conf
>>>
>>> Issue: snmp agent is sending multiple traps for the same host(s)
>>>
>>> 1) lets start with valid working state where snmpd.conf has some basic
>>> configuration (entries) and snmpd is up and running
>>> 2) Want to perform some new configurations like adding / removing new
>>> trap destination host IP addresses with trapsess / trap2sink entries to
>>> snmpd.conf
>>> 3) A new file snmpd.conf is completely rewritten with its current
>>> entries and new configuration entries are added to the file (snmpd.conf)
>>> and copy this file to snmpd.conf standard path which is read by snmp agent.
>>> 4) Then call snmpd.c::netsnmp_reconfig() API to read new configuration
>>> values.
>>> 5) snmpd still runs and performs reconfigure steps using new
>>> configuration file (which has old entries and as well as new entries).
>>> 6) After the step 5 then system behaves incorrect. For any event / alarm
>>> generated in the system then snmp agent sends more and more traps to the
>>> same hosts and this count depends on how many times the configuration
>>> changes are performed on snmpd.conf file
>>>
>>> This clearly indicates that the procedure followed is wrong and appears
>>> that snmpd is learning same hosts addresses many times with snmpd.conf
>>> entries? Should it suppose to learn and populate only 1 entry per host
>>> while it configures and populates the snmpTargetAddrTable? Is there any
>>> other parameters which does sending multiple traps? like repeater / retry
>>> count etc?
>>>
>>> What is the correct way to create/update the configuration file for
>>> adding / removing entries in snmpd.conf? I appreciate your help and any
>>> inputs / pointers on this model.
>>>
>>> Thanks,
>>> Maanas
>>>
>>
>>
>>
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