[mrtg] Odd problem with squid mibs..

#1 (**permalink**) 03-26-2008

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I have a squid monitoring configuration, which I recently ported from
one server that uses mrtg-2.11.1 onto a server running mrtg-2.16.1.

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On 2.11.1 I had no problems at all with this config, using the same
daemon_mode.cfg and everything.

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I brought over my MRTG config, copied my squid mibfile, etc onto the new
server. My switch configs are different in that I regenerated them using
snmp v2 commands, due to the overflows.. however, even prior to that the
squid config wasn't working on the new box.

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What's strange is, mrtg-2.116.1 appears to parse some of the variables
out of my squid mibfile when operated in daemon mode, but parses other
variables out of the same mibfile just fine.

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If I run the config manually, i.e.:

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env LANG=3DC /usr/bin/mrtg --logging /var/log/mrtg.log squid_server.cfg

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All works fine.

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If I load it with my daemon mode config, it starts to break.

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My init script sets LANG=3DC near the top of the file, and passes mrtg:
the following parameters: /etc/mrtg/daemon_mode.cfg --logging
/var/log/mrtg.log

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My daemon_mode.cfg looks like this (actual server names removed):

RunAsDaemon: Yes

Interval: 5

EnableIPv6: no

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Include: /etc/mrtg/router.cfg

Include: /etc/mrtg/switch1.cfg

Include: /etc/mrtg/switch2.cfg

Include: /etc/mrtg/ciscoswitch_cpu.cfg

Include: /etc/mrtg/server1.cfg

Include: /etc/mrtg/squid_server.cfg

Include: /etc/mrtg/ups.cfg

....

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Each config file has its own LoadMIBs, when needed. This particular
server is the 3rd in the config that uses LoadMIBs, and it's the only
one that loads the squid mib. None of my other configs have trouble
loading mib files that others aren't using. (ie: my ups config, which
comes later in daemon_mode.cfg)

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In daemon mode this target works:

Target[squid_server-reqhitratios]:
cacheRequestHitRatio.5&cacheRequestHitRatio.60:com munity@server:3401

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It graphs perfectly fine, with no errors.

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In daemon mode this target causes an error:

Target[squid_server-hit]:
cacheHttpHits&cacheServerRequests:community@server :3401

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In my mrtg.log I get:

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2008-03-26 15:01:15 -- Unknown SNMP var cacheServerRequests

at /usr/bin/mrtg line 2199

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However, cacheServerRequests is declared in the same mibfile as
cacheRequestHitRatio.

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My loadmib for squid_server.cfg looks like:

LoadMIBs: /usr/share/snmp/mibs/SQUID-MIB.txt,
/usr/share/snmp/mibs/UCD-SNMP-MIB.txt

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And I can verify that variable in that same mibfile works properly with
snmpget:

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# snmpget -m /usr/share/snmp/mibs/SQUID-MIB.txt -v1 -c community
squid_server:3401 cacheServerRequests

SQUID-MIB::cacheServerRequests.0 =3D INTEGER: 4715641

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I can also verify that neither variable works without manually loading
the mibfile:

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# snmpget -v1 -c community squid_server:3401 cacheServerRequests

cacheServerRequests: Unknown Object Identifier (Sub-id not found: (top)
-> cacheServerRequests)

# snmpget -v1 -c community squid_server:3401 cacheRequestHitRatio

cacheRequestHitRatio: Unknown Object Identifier (Sub-id not found: (top)
-> cacheRequestHitRatio)

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What would cause a mibfile to work with snmpget, work with both MRTGs
manually, work in daemon mode on 2.11.1 but only partially work with
MRTG in Daemon mode in 2.16.1? Is it unreasonable for me to have
multiple LoadMIB statements about?

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I've also already verified no other mib file on the system declares
anything named cacheServerRequests:

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# grep "cacheServerRequests" /usr/share/snmp/mibs/*

/usr/share/snmp/mibs/SQUID-MIB.txt: cacheServerRequests
OBJECT-TYPE

#

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<body lang=3DEN-US link=3Dblue vlink=3Dpurple>

<div class=3DSection1>

I have a squid monitoring configuration, which I =
recently
ported from one server that uses mrtg-2.11.1 onto a server running =
mrtg-2.16.1.<o:p></o:p>

<o:p> </o:p>

On 2.11.1 I had no problems at all with this config, =
using
the same daemon_mode.cfg and everything.<o:p></o:p>

<o:p> </o:p>

I brought over my MRTG config, copied my squid =
mibfile, etc
onto the new server. My switch configs are different in that I =
regenerated them
using snmp v2 commands, due to the overflows.. however, even prior to =
that the
squid config wasn’t working on the new =
box.<o:p></o:p>

<o:p> </o:p>

What’s strange is, mrtg-2.116.1 appears to =
parse some
of the variables out of my squid mibfile when operated in daemon mode, =
but
parses other variables out of the same mibfile just =
fine.<o:p></o:p>

<o:p> </o:p>

If I run the config manually, =
i.e.:<o:p></o:p>

<o:p> </o:p>

env LANG=3DC /usr/bin/mrtg --logging =
/var/log/mrtg.log squid_server.cfg<o:p></o:p>

<o:p> </o:p>

All works fine.<o:p></o:p>

<o:p> </o:p>

If I load it with my daemon mode config, it starts to =
break.<o:p></o:p>

<o:p> </o:p>

My init script sets LANG=3DC near the top of the =
file, and
passes mrtg: the following parameters: /etc/mrtg/daemon_mode.cfg =
--logging
/var/log/mrtg.log<o:p></o:p>

<o:p> </o:p>

<o:p> </o:p>

My daemon_mode.cfg looks like this (actual server =
names
removed):<o:p></o:p>

RunAsDaemon: Yes<o:p></o:p>

Interval:    =
5<o:p></o:p>

EnableIPv6: no<o:p></o:p>

<o:p> </o:p>

Include: =
/etc/mrtg/router.cfg<o:p></o:p>

Include: =
/etc/mrtg/switch1.cfg<o:p></o:p>

Include: =
/etc/mrtg/switch2.cfg<o:p></o:p>

Include: =
/etc/mrtg/ciscoswitch_cpu.cfg<o:p></o:p>

Include: =
/etc/mrtg/server1.cfg<o:p></o:p>

Include: =
/etc/mrtg/squid_server.cfg<o:p></o:p>

Include: =
/etc/mrtg/ups.cfg<o:p></o:p>

...<o:p></o:p>

<o:p> </o:p>

Each config file has its own LoadMIBs, when needed. =
This
particular server is the 3rd in the config that uses =
LoadMIBs, and
it’s the only one that loads the squid mib. None of my other =
configs have
trouble loading mib files that others aren’t using. (ie: my ups =
config,
which comes later in daemon_mode.cfg)<o:p></o:p>

<o:p> </o:p>

In daemon mode this target =
works:<o:p></o:p>

Target[squid_server-reqhitratios]:
cacheRequestHitRatio.5&cacheRequestHitRatio.60 :community@server:3401<=
o:p></o:p>

<o:p> </o:p>

It graphs perfectly fine, with no =
errors.<o:p></o:p>

<o:p> </o:p>

In daemon mode this target causes an =
error:<o:p></o:p>

Target[squid_server-hit]:
cacheHttpHits&cacheServerRequests:community@se rver:3401<o:p></o:p></s=
pan>

<o:p> </o:p>

In my mrtg.log I get:<o:p></o:p>

<o:p> </o:p>

2008-03-26 15:01:15 -- Unknown SNMP var =
cacheServerRequests<o:p></o:p>

 at /usr/bin/mrtg line =
2199<o:p></o:p>

<o:p> </o:p>

However, cacheServerRequests is declared in the same =
mibfile
as cacheRequestHitRatio.<o:p></o:p>

<o:p> </o:p>

My loadmib for squid_server.cfg looks =
like:<o:p></o:p>

LoadMIBs: /usr/share/snmp/mibs/SQUID-MIB.txt,
/usr/share/snmp/mibs/UCD-SNMP-MIB.txt<o:p></o:p>

<o:p> </o:p>

And I can verify that variable in that same mibfile =
works
properly with snmpget:<o:p></o:p>

<o:p> </o:p>

# snmpget -m /usr/share/snmp/mibs/SQUID-MIB.txt =
–v1 -c
community squid_server:3401 =
cacheServerRequests<o:p></o:p>

SQUID-MIB::cacheServerRequests.0 =3D INTEGER: =
4715641<o:p></o:p>

<o:p> </o:p>

I can also verify that neither variable works without
manually loading the mibfile:<o:p></o:p>

<o:p> </o:p>

# snmpget  -v1 -c community squid_server:3401
cacheServerRequests<o:p></o:p>

cacheServerRequests: Unknown Object Identifier =
(Sub-id not
found: (top) -> cacheServerRequests)<o:p></o:p>

# snmpget  -v1 -c community squid_server:3401
cacheRequestHitRatio<o:p></o:p>

cacheRequestHitRatio: Unknown Object Identifier =
(Sub-id not
found: (top) -> cacheRequestHitRatio)<o:p></o:p>

<o:p> </o:p>

<o:p> </o:p>

What would cause a mibfile to work with snmpget, work =
with both
MRTGs manually, work in daemon mode on 2.11.1 but only partially work =
with MRTG
in Daemon mode in 2.16.1?  Is it unreasonable for me to have =
multiple
LoadMIB statements about?<o:p></o:p>

<o:p> </o:p>

I’ve also already verified no other mib file on =
the
system declares anything named =
cacheServerRequests:<o:p></o:p>

<o:p> </o:p>

# grep "cacheServerRequests"
/usr/share/snmp/mibs/*<o:p></o:p>

/usr/share/snmp/mibs/SQUID-MIB.txt:   &=
nbsp;   
cacheServerRequests OBJECT-TYPE<o:p></o:p>

#<o:p></o:p>

<o:p> </o:p>

<o:p> </o:p>

<o:p> </o:p>

<o:p> </o:p>

<o:p> </o:p>

<o:p> </o:p>

<o:p> </o:p>

<o:p> </o:p>

<o:p> </o:p>

</div>

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