Alloy SNMP exporter error "server returned HTTP status 400 Bad Request"

Grafana Alloy
1

Hi,

I’m trying to migrate from prometheus/snmp_exporter to Grafana Alloy. The config I’m using has been working fine with the former for a long time now, however returns the above mentioned error when used with Alloy.

Here’s a snippet from my config.alloy:

prometheus.exporter.snmp "example" {
    config_file = "/etc/alloy/snmp.yml"

    target "canon_printer" {
        address     = "192.168.1.213"
        module      = "printer_mib"
        auth        = "canon"
        walk_params = "public"
    }
}

Here’s the snmp.yaml:

auths:
  canon:
    security_level: authPriv
    auth_protocol: SHA
    username: 'username'
    password: 'password'
    priv_protocol: AES
    priv_password: 'password'
    version: 3

Alloy is running in a Docker container, the local snmp.yml is mapped to /etc/alloy/snmp.yml via volume mount.

Anybody got an idea as to why this won’t work?

2

Okay, did some more debugging and found the error. Using curl got me the following:

Unknown module 'printer_mib'

I was able to solve it by getting the default snmp.yml and merge it with my custom config.

Now my question becomes: Is this the way to go? Is there no default snmp.yml included with Alloy?

1 Like
3

that is actually a great idea. do devices that have snmp share same identical values in the mib?

4

Well, I’m by no means an SNMP expert but at least that’s how snmp_exporter does it and it seems to make sense.

5

that is how it does what?
my question was is there a standard of snmp values across all devices by all manufacturers of devices that implement snmp?

i would think it would be daunting to provide a sample yaml to account for all types of mib as they might differ from one manufacturer to another?

not an expert of snmp by any stretch

6

What’s weird is that, when asking Grot (the AI helper) it responded with the following:

Yes, Alloy does come with default SNMP modules built-in. According to the knowledge sources, the SNMP exporter in Alloy includes a set of pre-defined SNMP modules.

Specifically, the Grafana Agent documentation states:

“SNMP modules available can be found in the embedded snmp.yml file here. If not specified, if_mib module is used.”

While this if referring to Agent instead of Alloy it seems to me that I’m not that far off…

1 Like
7

I’m pretty sure that different manufacturers of a specific category share the same MIBs. So for example all printers should expose the same SNMP OIDs.

BTW: I think they’re already working on this in this Pull Request

1 Like
8

Just found the snmp.yaml included with Alloy here

So now I’m just waiting for the aforementioned PR to get merged and a new version to be released to have my issue fixed :slight_smile:

1 Like