SNMP Exporter - server returned HTTP status 400 Bad Request

[G0nz0uk]

Hello,

I'm just trying to scrape 2 OIDs using SNMP_Exporter, but something isn't working as I get an error of:

server returned HTTP status 400 Bad Request

Here is my generator.yml

  auths:
    auth_name:
      version: 2  # SNMP version to use. Defaults to 2.
                  # 1 will use GETNEXT, 2 and 3 use GETBULK.
  
      # Community string is used with SNMP v1 and v2. Defaults to "public_v2".
      community: public
  
  modules:
    module_name:  # The module name. You can have as many modules as you want.
      walk:       # List of OIDs to walk. Can also be SNMP object names or specific instances.
        - sysUpTime                  # Same as "1.3.6.1.2.1.1.3"
        - 1.3.6.1.4.1.33762.7.7.2  # back temp
        - 1.3.6.1.4.1.33762.7.6.2  # Front of display temp
  
      max_repetitions: 25  # How many objects to request with GET/GETBULK, defaults to 25.
                          # May need to be reduced for buggy devices.
      retries: 3   # How many times to retry a failed request, defaults to 3.
      timeout: 5s  # Timeout for each individual SNMP request, defaults to 5s.

I create the snmp.yml

  /opt/snmp_exporter/generator# ./generator generate
  ts=2023-11-10T15:30:09.608Z caller=net_snmp.go:162 level=info msg="Loading MIBs" from=$HOME/.snmp/mibs:/usr/share/snmp/mibs:/usr/share/snmp/mibs/iana:/usr/share/snmp/mibs/ietf
  ts=2023-11-10T15:30:11.208Z caller=main.go:122 level=warn msg="NetSNMP reported parse error(s)" errors=6
  ts=2023-11-10T15:30:11.462Z caller=main.go:53 level=info msg="Generating config for module" module=module_name
  ts=2023-11-10T15:30:11.503Z caller=main.go:68 level=info msg="Generated metrics" module=module_name metrics=3
  ts=2023-11-10T15:30:11.504Z caller=main.go:93 level=info msg="Config written" file=/opt/snmp_exporter/generator/snmp.yml

Which looks like this:

  # WARNING: This file was auto-generated using snmp_exporter generator, manual changes will be lost.
  auths:
    auth_name:
      community: public
      security_level: noAuthNoPriv
      auth_protocol: MD5
      priv_protocol: DES
      version: 2
  modules:
    module_name:
      get:
      - 1.3.6.1.2.1.1.3.0
      - 1.3.6.1.4.1.33762.7.6.2.0
      - 1.3.6.1.4.1.33762.7.7.2.0
      metrics:
      - name: sysUpTime
        oid: 1.3.6.1.2.1.1.3
        type: gauge
        help: The time (in hundredths of a second) since the network management portion
          of the system was last re-initialized. - 1.3.6.1.2.1.1.3
      - name: rFrontTemp
        oid: 1.3.6.1.4.1.33762.7.6.2
        type: gauge
        help: Front temperature measured by the sensor on the front of the display.
          - 1.3.6.1.4.1.33762.7.6.2
      - name: rHumidity
        oid: 1.3.6.1.4.1.33762.7.7.2
        type: gauge
        help: Relative Humidity measured by the sensor embedded on the diagnostic board.
          - 1.3.6.1.4.1.33762.7.7.2
      max_repetitions: 25
      retries: 3
      timeout: 5s

Copy my custom mib file GDS-DIAG-MIB.mib to /usr/share/snmp/mibs as it seem to look there.

Copy the generated snmp.yml to my snmp_exporter docker volume:

/var/lib/docker/volumes/snmp-exporter-etc/_data/snmp.yml

Add to the Prometheus.yml to scrape, I've removed the other bits:

    - job_name: 'snmp_dep'
      static_configs:
        - targets:
          - 10.1.80.202  # SNMP device.
    #      - switch.local # SNMP device.
    #      - tcp://192.168.1.3:1161  # SNMP device using TCP transport and custom port.
      metrics_path: /snmp
      params:
        module: [GDS-DIAG-MIB]
      relabel_configs:
        - source_labels: [__address__]
          target_label: __param_target
        - source_labels: [__param_target]
          target_label: instance
        - target_label: __address__
          replacement: 10.1.105.16:9116  # The SNMP exporter's real hostname:port.
  
    # Global exporter-level metrics
    - job_name: 'snmp_exporter'
      static_configs:
        - targets: ['10.1.105.16:9116']

Restart Prometheus container.

SNMP Exporter - server returned HTTP status 400 Bad Request

If I do an SNMP walk from the VM docker is on they work too.

snmpwalk -v2c -c public 10.1.80.202 1.3.6.1.4.1.33762.7.6.2.0 
SNMPv2-SMI::enterprises.33762.7.6.2.0 = INTEGER: 45

Docker info

    snmp-exporter:
      image: quay.io/prometheus/snmp-exporter
      ports:
        - 9116:9116
        - 116:116/udp
      volumes:
        - snmp-exporter-etc:/etc/snmp-exporter/
      restart: always
      command: --config.file=/etc/snmp-exporter/snmp.yml
      networks:
      - monitoring

Any help would be most appreciated.

Thanks

[alexhatzo]

You should change the module: [] in your scrape configs to match the module from snmp.yml (or probably change the snmp.yml to match the one you want as it currently is "module_name"). Probably need to add the auth: [] param there as well