Hi there,
I looked this up in the CheckMK Documentation before but unfortunately they didn’t add it yet.
Is there any way to retrieve multiple independent SNMP areas with one “register.snmp_section()” statement?
Thank you,
Lou1s
Yes there is. A small example follows.
register.snmp_section(
name="cmciii",
detect=contains(".1.3.6.1.2.1.1.2.0", ".1.3.6.1.4.1.2606.7"),
fetch=[
SNMPTree(
base=".1.3.6.1.4.1.2606.7.4.1.2.1",
oids=[
OIDEnd(),
"2", # RITTAL-CMC-III-MIB::cmcIIIDevName
"3", # RITTAL-CMC-III-MIB::cmcIIIDevAlias
"6", # RITTAL-CMC-III-MIB::cmcIIIDevStatus
],
),
SNMPTree(
base=".1.3.6.1.4.1.2606.7.4.2.2.1",
oids=[
OIDEnd(),
"3", # RITTAL-CMC-III-MIB::cmcIIIVarName
"4", # RITTAL-CMC-III-MIB::cmcIIIVarType
"5", # RITTAL-CMC-III-MIB::cmcIIIVarUnit
"7", # RITTAL-CMC-III-MIB::cmcIIIVarScale
"10", # RITTAL-CMC-III-MIB::cmcIIIVarValueStr
"11", # RITTAL-CMC-III-MIB::cmcIIIVarValueInt
],
),
],
parse_function=parse_cmciii,
)
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@andreas-doehler I just got the error “value of ‘fetch’ keyword must be SNMPTree or non-empty list of SNMPTrees”. Is there anything that I have to import or adjust in comparison to the “normal” SNMP-Plugin process?
Thank you!
you might need to change the parse function a bit. To stay with @andreas-doehler example this sould change from (for a single SNMPTree):
def parse_cmciii(string_table: StringByteTable):
to (for a list of SNMPTrees):
from typing import List
def parse_cmciii(string_table: List[StringByteTable]):
@thl-cmk Thank you for the answer. Is “StringByteTable” a type which is pre implemented by checkmk? Because now I get the error “name ‘StringByteTable’ is not defined”.
it is, but I see this is my error, leave the Byte out of StringByteTable 
. This is a special version of StringTable that will be used with OIDBytes in the SNMPTree. Both versions of string_table can be imported like this
from cmk.base.plugins.agent_based.agent_based_api.v1.type_defs import (
StringByteTable,
StringTable,
)
@thl-cmk No problem 
After importing the StringTable I still get the error for the fetch: “value of ‘fetch’ keyword must be SNMPTree or non-empty list of SNMPTrees”. Do I have to change something in consideration to the assignment of the fetch variable?
can you post your register.snmp_section here?
@thl-cmk Here it is:
register.snmp_section(
name="wago_750_881",
parse_function=parse_wago_750_881,
detect=contains(".1.3.6.1.2.1.1.1.0", "WAGO 750-881"),
fetch=[
SNMPTree(
base=".1.3.6.1.2.1.1",
oids=[
OIDEnd(),
"3.0",
],
),
SNMPTree(
base=".1.3.6.1.2.1.4",
oids=[
OIDEnd(),
"3.0",
"4.0",
"5.0",
"6.0",
"7.0",
"8.0",
"9.0",
"10.0",
"11.0",
"12.0",
],
),
],
)
looks ok, have just completed it with the rest of a very basic check and it works. So your issue is not with the register.snmp_section
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
from typing import List
from cmk.base.plugins.agent_based.agent_based_api.v1.type_defs import (
DiscoveryResult,
CheckResult,
StringTable,
)
from cmk.base.plugins.agent_based.agent_based_api.v1 import (
register,
Service,
Result,
State,
SNMPTree,
contains,
OIDEnd,
)
def parse_wago_750_881(string_table: List[StringTable]):
print(string_table) # for debugging only
return string_table
def discovery_wago_750_881(section) -> DiscoveryResult:
yield Service()
def check_wago_750_881(section) -> CheckResult:
yield Result(state=State.UNKNOWN, summary='Not yet implemented')
register.snmp_section(
name="wago_750_881",
parse_function=parse_wago_750_881,
detect=contains(".1.3.6.1.2.1.1.1.0", "WAGO 750-881"), # replaced with 'cisco'
fetch=[
SNMPTree(
base=".1.3.6.1.2.1.1",
oids=[
OIDEnd(),
"3.0",
],
),
SNMPTree(
base=".1.3.6.1.2.1.4",
oids=[
OIDEnd(),
"3.0",
"4.0",
"5.0",
"6.0",
"7.0",
"8.0",
"9.0",
"10.0",
"11.0",
"12.0",
],
),
],
)
register.check_plugin(
name='wago_750_881',
service_name='Wago',
discovery_function=discovery_wago_750_881,
check_function=check_wago_750_881,
)
a sample cmk -vII
OMD[build]:~$ cmk -vII --debug testdevice
Discovering services and host labels on: testdevice
testdevice:
+ FETCHING DATA
[SNMPFetcher] Execute data source
No piggyback files for 'testdevice'. Skip processing.
No piggyback files for 'simulant.home.intern'. Skip processing.
[PiggybackFetcher] Execute data source
+ ANALYSE DISCOVERED HOST LABELS
[[['', '29485498']], [['', '60314567', '15', '0', '41447733', '0', '0', '2300700', '2031809', '8', '337']]]
SUCCESS - Found no host labels
+ ANALYSE DISCOVERED SERVICES
+ EXECUTING DISCOVERY PLUGINS (9)
1 wago_750_881
SUCCESS - Found 1 services
OMD[build]:~$
a sample cmk -v
OMD[build]:~$ cmk -v --debug testdevice
+ FETCHING DATA
[SNMPFetcher] Execute data source
No piggyback files for 'testdevice''. Skip processing.
No piggyback files for 'simulant.home.intern'. Skip processing.
[PiggybackFetcher] Execute data source
[[['', '29485498']], [['', '60314567', '15', '0', '41447733', '0', '0', '2300700', '2031809', '8', '337']]]
Wago Not yet implemented
No piggyback files for 'testdevice'. Skip processing.
[snmp] Success, [piggyback] , execution time 0.4 sec | execution_time=0.370 user_time=0.130 system_time=0.040 children_user_time=0.000 children_system_time=0.000
as you can see CMK will fetch your OIDs and creates the service Wago. The only thing I have changed on your section is replacing WAGO 750-881 by cisco as I don’t have a WAGO device for testing.
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