All,
I recently moved a collectd installation from a RHEL5 (collectd 4.10.3)
to a RHEL6 machine (collectd 4.10.8). After the move, the snmp plugin
stopped collecting some data, and started complaining:
snmp plugin: csnmp_instance_list_add failed.
The config causing trouble is this:
<Plugin snmp>
<Data "std_traffic">
Type "if_octets"
Table true
Instance "IF-MIB::ifDescr"
Values "IF-MIB::ifHCInOctets" "IF-MIB::ifHCOutOctets"
</Data>
<Host "rachael.net.ic.ac.uk">
Address "..."
Version 2
Community "abc123"
Collect "std_traffic"
Interval 120
</Host>
</Plugin>
I believe the issue is caused by the fact that ifDescr is not inside the
same OID tree as ifHCInOctets - the former is under ifTable and the
latter under ifXTable. But it worked on the older version :o(
In this case, the ifHC* OIDS are under ifXTable, which is defined as
"augmenting" ifTable:
ifXTable OBJECT-TYPE
SYNTAX SEQUENCE OF IfXEntry
...
::= { ifMIBObjects 1 }
ifXEntry OBJECT-TYPE
SYNTAX IfXEntry
MAX-ACCESS not-accessible
...
AUGMENTS { ifEntry }
::= { ifXTable 1 }
I think the fix to this issue:
https://github.com/collectd/collectd/issues/131
...might have broken it. Is this intentional / desired / known?
Obviously I can work around this trivially (I'll probably write a script
to gather the data and submit via unix socket) but it seems a bit
unfortunate - conceptually, the "index" for ifXTable is ifIndex, which
is also "out of tree".
Regards,
Phil
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