SNMP Exporter issue - Server returned HTTP status 400 Bad Request

[Andy White]

Hello, 

Could anyone help this issue regarding SNMP Exporter: server returned HTTP status 400 Bad Request

https://www.reddit.com/r/grafana/comments/17s6uvh/snmp_exporter_server_returned_http_status_400_bad/

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.

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

[Brian Candler]

snmp_exporter version?

You can use tcpdump to show the full HTTP request and response to snmp_exporter. In the body of the response, I would expect to see a message describing what's wrong.

You can also use curl to send a HTTP request to snmp_exporter using the exact set of parameters that you believe that prometheus is sending:

curl -v "http://x.x.x.x:9116/snmp?module=GDS-DIAG-MIB&target=10.100.80.202"

Again, the error is probably clear.

I note that you're not sending an "auth" parameter, but if you're using the default auth/community it should work I think.