I've been trying for a couple of days now to capture a small subset of the
SNMP data published by a Cisco router. I'm trying to work out a way to
capture the data by interface name (e.g. Et0) rather than SNMP OIDs - that
way if something causes the interfaces to be renumbered, the data
collection doesn't break.
I've tried everything I can find, all without luck. Here's what I'm
conceptually asking Telegraf to go get:
[[inputs.snmp]]
interval = "30s"
[[inputs.snmp.host]]
address = "W.X.Y.Z:161"
version = 2
community = "MyCommunity"
collect = [ "interface", "bytesIn", "bytesOut" ]
[[inputs.snmp.field]]
name = "hostname"
oid = "RFC1213-MIB::sysName.0"
is_tag = true
[[inputs.snmp.table]]
name = "snmp"
inherit_tags = [ "hostname" ]
oid = "IF-MIB::ifXTable"
include_instances = [ 'Et0', 'Tu0' ]
[[inputs.snmp.table.field]]
name = "interface"
oid = "IF-MIB::ifName"
is_tag = true
[[inputs.snmp.table.field]]
name = "bytesIn"
oid = "IF-MIB::ifHCInOctets"
[[inputs.snmp.table.field]]
name = "bytesOut"
oid = "IF-MIB::ifHCOutOctets"
This one tells me:
Error parsing /etc/telegraf/telegraf.d/bridge.telegraf.conf, line 4: field
corresponding to `host' is not defined in `*snmp.Snmp'
I've tried using include_instances attached to the interface field or to
the table:
Error parsing /etc/telegraf/telegraf.d/bridge.telegraf.conf, line 21: field
corresponding to `include_instances' is not defined in `*snmp.Field'
Error parsing /etc/telegraf/telegraf.d/bridge.telegraf.conf, line 16: field
corresponding to `include_instances' is not defined in `*snmp.Table'
I've been following these articles among others:
- https://www.dev-eth0.de/blog/2016/12/06/grafana_snmp.html
-
http://installfights.blogspot.com.au/2016/10/snmp-telegraf-influxdb.html
-
https://github.com/influxdata/telegraf/blob/master/plugins/inputs/snmp/README.md
-
https://github.com/influxdata/telegraf/blob/master/plugins/inputs/snmp/CONFIG-EXAMPLES.md
It seems silly to only support configurations where every counter is stored
for every port (a 48 port switch where you only want to monitor 2 counters
on 2 ports might be producing 240x the data, 99.9% of which is rubbish).
Would I be right in guessing this is what subtables are for? What's the
syntax for them (I can't find any documentation suitable for a muppet like
me).
In case it's important, I'm on Telegraf v1.2.0 (git: release-1.2
b2c1d98cff5a58d5ded3e74741c6bc32d6e789ee)
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