[mrtg] Re: Math and Upgrading

Koelstra, J. (Jan) JKoelstra at MINSZW.NL
Fri Mar 14 17:29:01 MET 2003 

David,

About the maths: You need 2 oid's at both sides of the '+'. So find an
oid that always returns 0, and next line should do the trick:

Target[SNMP_TEST]: snmpInGetNexts.0:public at 1.1.1.1&<some oid returning a
zero> +
snmpInGetRequests.0:public at 1.1.1.1&snmpOutGetResponses.0:public at 1.1.1.1

About upgrading: I don't think there is need to upgrade only for making
the maths work. I do remember however that after upgrading from MRTG
2.8.something to MRTG 2.9. my targets with maths went wrong. The only
way I got them working again was by using the whole numerical oid. I
never changed them back to the named oid. So I do not know if you still
have to use the full numeric oid in your and/or the latest version of
MRTG.

Hth,

Jan.


-----Original Message-----
From: CHENG, DAVID (PB) [mailto:dc4983 at sbc.com] 
Sent: Friday, March 14, 2003 3:58 PM
To: 'mrtg at list.ee.ethz.ch'
Subject: [mrtg] Math and Upgrading


OK, these are two fairly lame questions, but please bear with me.

1) I have not tried to add targets (other than simple examples) in the
past, so this is my first experience.  I've tried to RTFM, but I must be
confusing myself or something.  Anyway, I have a configuration file that
is trying to add snmpInGetNexts and snmpInGetRequests, then get
snmpOutGetResponses (Yes, I realize that MRTG will cause these counters
to change; kinda like Heisenberg's Uncertainty Principle).  I can
retrieve data for each individual MIB without a problem, but when I try
to add them, I get error messages.  I have tried these target strings
and received the following
errors:

Target[SNMP_TEST]: snmpInGetNexts.0:public at 1.1.1.1 +
snmpInGetRequests.0:public at 1.1.1.1&snmpOutGetResponses.0:public at 1.1.1.1

sh-2.05$ mrtg snmp_test.cfg
Use of uninitialized value in string eq at
/usr/local/mrtg-2/bin/../lib/mrtg2/MRTG_lib.pm line 1138. Use of
uninitialized value in string eq at
/usr/local/mrtg-2/bin/../lib/mrtg2/MRTG_lib.pm line 1138. Use of
uninitialized value in string eq at
/usr/local/mrtg-2/bin/../lib/mrtg2/MRTG_lib.pm line 1139. Use of
uninitialized value in string eq at
/usr/local/mrtg-2/bin/../lib/mrtg2/MRTG_lib.pm line 1139. Use of
uninitialized value in concatenation (.) or string at
/usr/local/mrtg-2/bin/../lib/mrtg2/MRTG_lib.pm line 1148. Use of
uninitialized value in concatenation (.) or string at
/usr/local/mrtg-2/bin/../lib/mrtg2/MRTG_lib.pm line 1148. cannot encode
Object ID 10.11.34.1: first subid too big in Object ID 10.11.34.1 at
/usr/local/mrtg/bin/mrtg line 1607
WARNING: skipping because at least the query for 10.11.34.1 on
10.11.34.1 did not succeed Use of uninitialized value in string eq at
/usr/local/mrtg/bin/mrtg line 1545. Use of uninitialized value in string
eq at /usr/local/mrtg/bin/mrtg line 1545. Use of uninitialized value in
hash element at /usr/local/mrtg/bin/mrtg line 1551. Use of uninitialized
value in hash element at /usr/local/mrtg/bin/mrtg line 1551. Use of
uninitialized value in hash element at /usr/local/mrtg/bin/mrtg line
1555. Use of uninitialized value in hash element at
/usr/local/mrtg/bin/mrtg line 1555. Use of uninitialized value in
concatenation (.) or string at /usr/local/mrtg/bin/mrtg line 1556. Use
of uninitialized value in concatenation (.) or string at
/usr/local/mrtg/bin/mrtg line 1556.
WARNING: Could not match host:'EnLA0201 at 10.11.34.1' ref:'' key:''
ERROR: Target[isd_rsm_cpu][_IN_] 'snmpInGetNexts. $$target[1]{$mode}  +
snmpInGetRequests.0:EnLA0201@ $$target[0]{$mode} ' (warn): Array found
where operator expected at (eval 6) line 1, at end of line
ERROR: Target[isd_rsm_cpu][_OUT_] 'snmpInGetNexts. $$target[1]{$mode}  +
snmpInGetRequests.0:EnLA0201@ $$target[0]{$mode} ' (warn): Array found
where operator expected at (eval 7) line 1, at end of line


Or, another target string yields this error:

Target[SNMP_TEST]: snmpInGetNexts.0 +
snmpInGetRequests.0&snmpOutGetResponses.0:public at 1.1.1.1

ERROR: Target[isd_rsm_cpu][_IN_] 'snmpInGetNexts.0 +  $$target[0]{$mode}
'
(eval): Bareword "snmpInGetNexts" not allowed while "strict subs" in use
at (eval 6) line 1.

ERROR: Target[isd_rsm_cpu][_OUT_] 'snmpInGetNexts.0 +
$$target[0]{$mode} '
(eval): Bareword "snmpInGetNexts" not allowed while "strict subs" in use
at (eval 7) line 1.


I think I am missing something really stupid, but I'm tired right now,
and I hope you guys will overlook this.  I could add these values in an
external script, but I figured the math would be easier...:)


2) I don't know if this has anything to do with this issue, but I am
currently running MRTG 2.9.22, RRDTOOL 1.0.39, and 14all.cgi 1.1p23.  I
know that there are newer versions of all these programs out there, but
this has been running smoothly for months, so I haven't thought about
upgrading.  Any compelling reasons to upgrade at this time?  Also, I
lost my previous upgrade notes (if I upgrade, this will be my second
time upgrading), but I seem to remember that it was fairly painless to
upgrade.  I think all I did was configure;make;make install (maybe I
never made any notes before because it was that easy?).  Is that still
true, or do I need to be careful of anything overwriting something that
I don't want overwritten?

Thanks for indulging me and wading through this post.

Best Regards,

David Cheng

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