That did the trick! I didn't understand that relabeling could be used to
modify the url path. Here's the final config that I ended up with:
- job_name: 'pdu'
static_configs:
- targets: [ 'localhost:9117', ]
labels:
pduname: 'pdu1'
- targets: [ 'localhost:9117', ]
labels:
pduname: 'pdu2'
metrics_path: '/snmp'
relabel_configs:
- source_labels: [__address__]
target_label: __param_target
replacement: '10.13.5.16'
- source_labels: ['pduname']
target_label: __param_module
I hadn't tried running the snmp_exporter directly on the snmpd_proxy host
because I couldn't get the generator to build on RHEL7. But it looks like
I can run the generator on a compatible host, then copy over the snmp.yml
that it produces. This should allow me to move the snmp_exporter to the
machine running the snmpd proxy, at which point I should be able to use the
relabel_config example from the documentation.
Thanks for the advice,
--Mike
On Wednesday, November 4, 2020 at 6:00:19 PM UTC-6 Brian Brazil wrote:
> On Wed, 4 Nov 2020 at 23:04, Michael Thomas <[email protected]> wrote:
>
>> Our SNMP-enabled devices are on a secure, non-routed subnet in our
>> datacenter. To enable snmp monitoring of them, we use a snmpd proxy[1].
>> This allows us to grab snmp data from each device using the same IP
>> address, but a different community name. For example:
>>
>> # snmpget -v2c -On -c pdu1 snmpd.proxy.host
>> .1.3.6.1.2.1.1.5.0.1.3.6.1.2.1.1.5.0 = STRING: DCS_PDU_10_1
>> # snmpget -v2c -On -c pdu2 snmpd.proxy.host .1.3.6.1.2.1.1.5.0
>> .1.3.6.1.2.1.1.5.0 = STRING: DCS_PDU_11_1
>>
>> Our snmp_exporter(s) run on the same host as prometheus, which is not the
>> same host that the snmp proxy is running on. I've generated a
>> snmp_exporter snmp.yml config that specified a different module for each
>> device:
>>
>> servertech_sentry3: &servertech_sentry3
>> walk:
>> - 1.3.6.1.4.1.1718.3.2.2
>> - 1.3.6.1.4.1.1718.3.2.3
>> [...]
>> pdu1:
>> <<: *servertech_sentry3
>> auth:
>> community: pdu1
>>
>> pdu2:
>> <<: *servertech_sentry3
>> auth:
>> community: pdu2
>>
>> This lets us use a single exporter for all identical devices by
>> specifying a different module, eg
>>
>> http://prometheus.host:9116/snmp?target=snmpd.proxy.host&module=pdu1
>> http://prometheus.host:9116/snmp?target=snmpd.proxy.host&module=pdu2
>>
>> However, I'm uncertain now to use this in my prometheus.yml file so that
>> they show up as different targets under the same job. I wanted to do
>> something like this:
>>
>> - job_name: 'pdu'
>> static_configs:
>> - targets:
>> - 'prometheus.host:9116/snmp?target=snmpd.proxy.host&module=pdu1'
>> - 'prometheus.host:9116/snmp?target=snmpd.proxy.host&module=pdu2'
>>
>> ...but prometheus doesn't like having the url path in the target; it only
>> wants a hostname:port. But in my case, I want to reuse the same
>> hostname:port for multiple targets.
>>
>
> You will need to use relabelling to set __param_module.
>
> However a simpler idea might be to run the snmp_exporter on the machine
> the snmpd_proxy is currently running on. Generally you want the snmp
> exporter near the network devices, not Prometheus, given how chatty SNMP is.
>
> Brian
>
>
>>
>> Is this something that is possible? If not, the only other option I see
>> is to run a separate snmp_exporter instance (listening on different ports)
>> for each snmp device (we have ~50 such devices). Ultimately I want to have
>> a single job_name, but be able to select data for each individual proxied
>> snmp device in grafana.
>>
>> --Mike
>> [1]http://net-snmp.sourceforge.net/wiki/index.php/Snmpd_proxy
>>
>> --
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>>
>> <https://groups.google.com/d/msgid/prometheus-users/2038b634-8058-4eb1-836f-31acd4b95a49n%40googlegroups.com?utm_medium=email&utm_source=footer>
>> .
>>
>
>
> --
> Brian Brazil
> www.robustperception.io
>
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