Hi
Thanks for the reply.
I follow the steps as you showed me, but problem still exist. I run the
command to debug (curl -g `
http://127.0.0.1:9116/snmp?module=if_mib&target=x.x.x.x&debug=true`
<http://127.0.0.1:9116/snmp?module=if_mib&target=x.x.x.x&debug=true>) and
it give me request timeout error:
error collecting metric Desc{fqName: "snmp_error", help: "Error scraping
target", constLabels: {}, variableLabels: []}: error getting target
x.x.x.x: request timeout (after 3 retries)
and the on the prometheus target shows:
[image: image.png]
just few questions:
do those changes have to be done in snmp generator ? and then generate a
snmp.yml? or it can be added straight away in snmp.yml?
What should I need to add, if for example the switch snmp version is V3?
Is it possible to have more than one string for snmp authentication in
snmp.yml?
Thanks
On Tue, Mar 1, 2022 at 7:57 AM Brian Candler <b.cand...@pobox.com> wrote:
> Aside: curl is useful for debugging:
> curl -g `
> http://127.0.0.1:9116/snmp?module=if_mib&target=x.x.x.x&debug=true`
> <http://127.0.0.1:9116/snmp?module=if_mib&target=x.x.x.x&debug=true>
>
> However in your case, you've found the problem: you need to set a
> community string.
>
> Unfortunately, snmp_exporter makes it hard to set this, because the MIB
> and the device authentication are bundled together in the "module". Here's
> the easiest way I've found to do this:
>
> 1. Edit snmp.yml (that was supplied with snmp_exporter, or that you
> generated)
>
> 2. Find the MIB that you're interested in using: in this case if_mib.
> Modify the first line like this:
>
> *if_mib:*
>
> becomes
>
> *if_mib: &if_mib*
>
> (this is called an "anchor" in YAML)
>
> 3. Add to the very *end* of the file:
>
>
>
>
>
> *if_mib_secret: <<: *if_mib version: 2 auth: community: BlahBlah123*
>
> What you're doing is taking a copy of the "if_mib" section, and then
> overriding some of the parameters (the 'auth' and 'version' keys) without
> changing anything else.
>
> [Aside: you should be able to do steps 1-3 using the snmp generator
> instead, but you'll have to duplicate the if_mib section in generator.yml
> instead, and then run the generator]
>
> 4. Restart snmp_exporter, and check this works using curl:
>
>
> *curl -g
> `http://127.0.0.1:9116/snmp?module=if_mib_secret&target=x.x.x.x&debug=true`
> <http://127.0.0.1:9116/snmp?module=if_mib_secret&target=x.x.x.x&debug=true>*
>
> 5. Change your scrape job for these devices to use module if_mib_secret
> instead of if_mib.
>
> Oddly, your scrape job shows a static target of only 127.0.0.1, i.e. it
> looks like you're sending queries to the snmpd running on prometheus
> itself, not to any remote devices. I would suggest that you use the
> file_sd mechanism, and also that you pick up the module from this, so that
> a single scrape job can handle any combination of targets and SNMP modules.
>
> - job_name: snmp
> metrics_path: /snmp
> file_sd_configs:
> - files:
> - /etc/prometheus/targets.d/snmp_targets.yml
> relabel_configs:
> - source_labels: [__address__]
> target_label: instance
> - source_labels: [__address__]
> target_label: __param_target
> - source_labels: [module]
> target_label: __param_module
> - target_label: __address__
> replacement: 127.0.0.1:9116 # SNMP exporter
>
> then in snmp_targets.yml you can put:
>
> - labels:
> module: if_mib
> targets:
> - foo
> - bar
> - labels:
> module: if_mib_secret
> targets:
> - baz
> - qux
>
>
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