Hi Dave,
Regarding the log options in /etc/default/snmp, I wanted to get some clear,
neat and separate log, so as not to get (overwhelmed by) irrelevant information.
The TCS-MIB as you'd expect from below in my mail in the said private MIB.
My intention was to have a perl sub-agent. The pass version was added just in
case it would work by chance (the kind of things that rarely happen, but for
which I get blamed if I don't try).
The access control settings are
% ls -l .snmp/mibs/tcs-agent-module.pl ~
-rw-rw-r-- 1 daniel daniel 3134 5 juin 14:51 .snmp/mibs/tcs-agent-module.pl
% ls -l /etc/snmp/snmpd.conf ~
-rw------- 1 root root 7362 6 juin 10:05 /etc/snmp/snmpd.conf
Here is an extract from the ~/.snmp/mibs/TCS-MIB.mib file
TCS-MIB DEFINITIONS ::= BEGIN
IMPORTS
OBJECT-TYPE, MODULE-IDENTITY, enterprises, Integer32,
Counter32, Gauge32, TimeTicks
FROM SNMPv2-SMI
TruthValue, TimeStamp FROM SNMPv2-TC
MODULE-COMPLIANCE,OBJECT-GROUP FROM SNMPv2-CONF
;
-- Gauge32 est un alias de Gauge
-- EnumVal defini comme un alias de INTEGER
EnumVal ::= INTEGER (0..4294967295)
tcs MODULE-IDENTITY
LAST-UPDATED "201205230000Z"
DESCRIPTION
"Example MIB objects for agent module example implementations"
REVISION "201205230000Z"
DESCRIPTION
"First draft"
::= { eads 3665 }
-- IANA assigned OID 16304 to EADS, but I can't find this in Cafuro, so it's
stated here
eads OBJECT IDENTIFIER ::= { enterprises 16304 }
--
-- test string
--
tcsTestString OBJECT-TYPE
SYNTAX OctetString
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This is a test string."
DEFVAL { "et comme ca ca marche?" }
::= { tcs 0 }
--
-- definitien de la conformite
-- TODO: a mettre au propre lorsque j'aurai trouve les explications
--
tcsMIBConformance OBJECT IDENTIFIER ::= { tcs 3 }
tcsMIBCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION "La declaration de conformite pour le site Tutoriel en Folie."
MODULE
GROUP tcsMIBGroup
DESCRIPTION "Le tcsGroup contient tous les objets."
::={ tcsMIBConformance 1}
tcsMIBGroup OBJECT-GROUP
OBJECTS {tcsPort1, tcsPort2}
STATUS current
DESCRIPTION "Une collection de tous les objets de la mib."
::= { tcsMIBConformance 2}
--
-- FIN
--
END
After applying what you adviced to the conf files, I still get
% snmpget -v1 -c public localhost sysDescr.0 sysUpTime.0; snmpget -v1 -c public
localhost tcsTestString.0
SNMPv2-MIB::sysDescr.0 = STRING: Linux debian 2.6.32-5-686 #1 SMP Mon Mar 26
05:20:33 UTC 2012 i686
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (5758) 0:00:57.58
tcsTestString.0: Unknown Object Identifier (Sub-id not found: (top) ->
tcsTestString)
I recompiled sources just to be able to make sure there had not been any
trouble in the standard debian package (it says v5.4.3) I use for snmp.
Regards,
Daniel
-----Message d'origine-----
De : [email protected] [mailto:[email protected]] De la part de Dave
Shield
Envoyé : mercredi 6 juin 2012 11:48
À : Chayvialle, Daniel (External)
Cc : [email protected]
Objet : Re: Stuck in the way of quering a private MIB (extension using perl)
On 6 June 2012 10:16, Chayvialle, Daniel (External)
<[email protected]> wrote:
> Here is what I modified in /etc/default/snmp:
>
> %diff /etc/default/snmpd /etc/default/snmpd.org ~
> 11,14c11
> < SNMPDOPTS='-M /var/lib/mibs/ietf:/home/daniel/.snmp/mibs -m
> SNMPv2-SMI:TCS-MIB -LS7d
> -Dagent_handler,disman:event::mib,disman:expr::mib,disman:expr::val,expScalars,fixup_mib_directory,get_mib_directory,perl,snmp_agent,snmpd,snmpv3
> -Lf /var/log/snmpd -u snmp -g snmp -I -smux -p /var/run/snmpd.pid'
> ---
>> SNMPDOPTS='-Lsd -Lf /dev/null -u snmp -g snmp -I -smux -p /var/run/snmpd.pid'
>
> This merely was an attempt to get any useful log, which did not succeed, at
> least to my understanding
OK - so (ignoring the commented out entries):
- you've switched from logging via syslog, to log directly to a
file. (-Lsd vs -Lf)
- you've explicitly set the MIB directories to search (-M)
- you've explicitly set the only MIB files to load (-m)
- you're setting a whole list of debug tokens to log
If this isn't getting you anything useful, I would suggest that you
revert to the
original invocation.
> Here is my /etc/snmp/snmp.conf
>
> #mibs :
> mibs +SNMPv2-SMI:TCS-MIB
Well, the SNMPv2-SMI is unnecessary, since this is loaded (or at least
handled) by default. Stick with the simple
mibs +TCS-MIB
Where does this MIB come from?
> Here are the changes I made to /etc/snmp/snmpd.conf
>
> % sudo diff /etc/snmp/snmpd.conf /etc/snmp/snmpd.conf.org ~
> 186,195d185
> < #DC/20120525: ajout d'un agent TCS-MIB
> < doDebugging 1
> < disablePerl false
> < pass 1.3.6.1.4.1.16304.3665 /usr/bin/perl
> /home/daniel/.snmp/mibs/tcs-agent-module.pl
> < perl 'do /home/daniel/.snmp/mibs/tcs-agent-module.pl';
Hmm.... there seems to be some confusion here.
Is this script a "pass" script, or a sub-agent-style script?
I'd expect to see one or the other of these two lines - but not both.
> < #DC/20120525: fin ajout
What are the access control settings in this file?
>
> These are various attempts to get the agent
>
> Here is the output when I walk iso
>
> % snmpwalk -v1 -c public localhost iso ~
> SNMPv2-MIB::sysDescr.0 = STRING: Linux debian 2.6.32-5-686 #1 SMP Mon Mar 26
> 05:20:33 UTC 2012 i686
> SNMPv2-MIB::sysObjectID.0 = OID: NET-SNMP-MIB::netSnmpAgentOIDs.10
> DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (5429948) 15:04:59.48
:
> SNMPv2-MIB::sysORUpTime.8 = Timeticks: (10) 0:00:00.10
> HOST-RESOURCES-MIB::hrSystemUptime.0 = Timeticks: (287043) 0:47:50.43
:
> HOST-RESOURCES-MIB::hrSystemMaxProcesses.0 = INTEGER: 0
> End of MIB
In other words, you can *only* see the system group.
What are the access control settings in your snmpd.conf file?
Have a look at the FAQ entry
"I can see the system group, but nothing else. Why?"
> % snmpget -v1 -c public localhost 1.3.6.1.4.1.8072 ~
> Error in packet
> Reason: (noSuchName) There is no such variable name in this MIB.
> Failed object: NET-SNMP-MIB::netSnmp
That will always fail.
You can only use "snmpget" on individual instances - i.e. the exact
variable names listed by "snmpwalk" or similar.
> ...even though it appears when I translate the whole tree
>
> % snmptranslate -Tt | grep netSnmp ~
> netSnmp(8072) type=24
> netSnmpObjects(1) type=0
> netSnmpExtendMIB(1) type=24
> netSnmpVacmMIB(9) type=24
> netSnmpExamples(2) type=24
> netSnmpExampleScalars(1) type=0
> netSnmpExampleInteger(1) type=16
> netSnmpExampleSleeper(2) type=16
> netSnmpExampleString(3) type=2 tc=49 hint=255t
> netSnmpExampleTables(2) type=0
> <and about 30 more lines>
The netSnmp object is a perfectly valid object. But it's an internal
structural object - acting as the root of a tree. It doesn't have a value
directly associated with it.
> But the following does not work:
>
> % snmptranslate -Tl netSnmp ~
> netSnmp: Unknown Object Identifier (Sub-id not found: (top) -> netSnmp)
snmptranslate is a relatively unusual command, in that by default it requires
an absolute object name - either a full path
(.iso.org.dod.internet.private.enterprises.netSnmp)
or qualified by the name of the MIB (NET-SNMP-MIB::netSnmp)
Try adding the option '-IR' to enable "random lookup"
snmptranslate -Tl -IR netSnmp
should work OK.
> Here is what I currently get for snmpget
>
> % snmpget -v1 -c public localhost sysDescr.0 ~
> SNMPv2-MIB::sysDescr.0 = STRING: Linux debian 2.6.32-5-686 #1 SMP Mon Mar 26
> 05:20:33 UTC 2012 i686
> % snmpget -v1 -c public localhost netSnmp ~
> Error in packet
> Reason: (noSuchName) There is no such variable name in this MIB.
> Failed object: NET-SNMP-MIB::netSnmp
Yes - that's correct.
> % snmpget -v1 -c public localhost tcs.0 ~
> tcs.0: Unknown Object Identifier (Sub-id not found: (top) -> tcs)
> % snmpget -v1 -c public localhost tcsTestString.0 ~
> tcsTestString.0: Unknown Object Identifier (Sub-id not found: (top) ->
> tcsTestString)
What does the TCS-MIB look like?
Where have you installed it?
> Here is what I currently get for snmpgetnext and snmpwalk:
>
> % snmpgetnext -v1 -c public localhost tcs ~
> tcs: Unknown Object Identifier (Sub-id not found: (top) -> tcs)
> % snmpwalk -v1 -c public localhost tcs ~
> tcs: Unknown Object Identifier (Sub-id not found: (top) -> tcs)
If snmpget does not understand the MIB object name, then the
other commands won't either.
> Here is what I currently get for snmptranslate:
>
> % snmptranslate -Td tcs ~
> tcs: Unknown Object Identifier (Sub-id not found: (top) -> tcs)
> % snmptranslate -Td netSnmp ~
> netSnmp: Unknown Object Identifier (Sub-id not found: (top) -> netSnmp)
> % snmptranslate -Td sysDescr ~
> sysDescr: Unknown Object Identifier (Sub-id not found: (top) -> sysDescr)
Don't worry about snmptranslate. It's much fussier than the other tools.
(See above)
> I also tried recompiling the last sources (5.7.1) yesterday evening,
I wouldn't worry about recompiling sources.
Given that you're extending the agent using perl scripts, this
shouldn't be necessary.
Concentrate on:
- first getting the access control sorted, so that you can query
the full agent
(not just the system group)
- getting the TCS-MIB loading properly, so that you can refer to
'tcs' successfully
- sorting out the perl extension - decide which approach you want to use,
and stick to that (rather than mixing the two).
Then - and only then - is it worth worrying about whether your
extension works or not.
Dave
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